JPS6332022B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a control panel for controlling power equipment such as motors.

[Background technology]

The control panel that forms the basis of this invention will be explained based on FIG. This control panel has a control section housed in a control panel body case (not shown), an operation display section attached to a control panel door (not shown), and two common lines CL. ₁ , CL ₂ and two dedicated lines EL ₁ and EL ₂ are connected by four crossover wires.

This will be explained in more detail below. In the state shown in Figure 1, the changeover switch SW is in the "off" position and is in a stopped state, but when the changeover switch SW is set to the "test" position, the power terminal r → common line CL ₁ → changeover switch SW → diode D ₄ → Dedicated line EL ₁ → NC side of switching contact alx ₁ of alarm relay ALX → Diode D ₁ →
A half-wave current is applied to one side in the path of resistor _{R 1} → operation relay X → power terminal s, and operation relay
Normally open contact x ₁ - Magnetic contactor MC thermal relay TR
A current flows between the NC side of the switching contact tr and the power supply terminal S, and the magnetic contactor MC is energized, and the normally open contact _MC1
is closed, power terminal s → normally open contact mc ₁ → diode D ₂ → dedicated line EL ₁ , → diode D ₅ → signal receiving relay Z → common line CL ₁ → half-wave energization on the other side through the path of power terminal r and the signal receiving relay Z is energized.
As a result, the normally open contact z ₁ of the signal receiving relay Z is closed, so that a current flows between the power terminal r - the common line CL ₁ - the normally open contact z ₁ - the operation display lamp RL - the common line CL ₂ - the power terminal s. flows, the operation indicator lamp RL lights up, and the normally closed contact z ₂ of the signal receiving relay Z opens, so that the power terminal r - the common line CL ₁ - the normally closed contact z ₂ -
The circuit between the stop indicator lamp GL, the common line CL ₂ and the power supply terminal s is opened, and the stop indicator lamp GL goes out. Moreover, the normally open contacts _mc2 to _mc4 are closed by the excitation of the electromagnetic contactor MC, and power is supplied to the load LD through the thermal relay TR.

In this manner, an operation test can be performed by setting the changeover switch SW to the "test" position.

In this state, when the changeover switch SW is turned to the "off" position again, power terminal r → common line CL ₁ → changeover switch SW → diode D ₄ → exclusive line EL ₁ → changeover contact
NC side _of alx ₁ → diode D ₁ → resistor R ₁ → operation relay Excitation stops, normally open contacts mc ₂ to _{mc 4} open, power supply to load LD stops, and normally open contacts
mc ₁ is opened and power terminal s → normally open contact mc ₁ - diode D ₂ → dedicated line EL ₁ → diode D ₅ → signal reception relay Z → common line CL ₁ → power terminal r path is opened and signal reception Excitation of relay Z stops, normally open contact _Z1 opens, and operation indicator lamp RL goes out.
Normally closed contact z ₂ closes and the stop indicator lamp GL lights up.

When the selector switch SW is set to the "auto" position,
When external contact k is closed, power terminal r → external contact k → dedicated line EL ₂ → changeover switch SW → diode D ⁴ → dedicated line EL ₁ → NC side of switching contact alx ₁ of alarm relay ALX → diode D ₁ → Resistor R ₁ → Operation relay
Perform the same operation as when the SW is in the "test" position. In this case, it is not a test but a real operation.

After that, when external contact k is opened and changeover switch SW is set to the "off" position, power terminal r → external contact k → dedicated line EL ₂ → changeover switch
SW → Diode D ₄ → Dedicated line EL ₁ → Switching contact alx ₁
NC side → Diode D ₁ → Resistor R ₁ → Operation relay X
→The path of the power supply terminal s is opened, the excitation of the operation relay X is stopped, and the operation is the same as when the changeover switch SW was switched from the "test" position to the "off" position. In this case, no matter what state the external contact k is in, the excitation of the operating relay X is stopped.

When the changeover switch SW is in the "auto" position and the external contact k is closed and the load LD is operating, an overcurrent flows through the load LD, causing the thermal relay TR to trip, causing the changeover contact tr to trip. but
When switched to the NO side, the excitation of the electromagnetic contactor MC is stopped, the normally open contacts _mc2 to _mc4 are opened, power supply to the load LD is stopped, and the normally open contact _mc1 is opened. on the other hand,
Alarm relay ALX is activated by switching the switching contact tr to the NO side.
is energized, its normally open contact alx ₁ closes and the flicker relay FCR starts operating, and its normally open contact fcr
is intermittently closed, switching contact alx ₁ of alarm relay ALX switches to NO side, power supply terminal s → normally open contact fcr → diode D ₃ → NO side of switching contact alx ₁ → dedicated line EL ₁ → Diode D ₅ → Signal receiving relay Z → Common line CL ₁ → Current flows intermittently in the path of power terminal r, so signal receiving relay Z is intermittently excited and normally open contact Z ₁ is intermittently activated. At the same time as the normally closed contact _z2 is intermittently closed, the operation indicator lamp RL blinks and the stop indicator lamp GL blinks in reverse to indicate a failure.

In addition, in the figure, capacitor C ₁ , which is connected in parallel to operation relay X and signal reception relay Z,
_C2 is intended to prevent contact chattering that occurs when each relay X, Z is operated in half-wave, and is designed to smooth the voltage applied to the coil. Further, a resistor R ₄ inserted and connected in series with the operating relay X constitutes a time constant circuit with the capacitor C ₁ to delay the operation of the operating relay X for a certain period of time.

The control panel shown in FIG. 1 is provided with an external contact k, and the control section is linked to the external contact k.
Because of the external contact k, two dedicated lines (crossover lines) EL ₁ and EL ₂ were required for one control system.

[Purpose of the invention]

An object of the present invention is to provide a control panel that allows a control section to be interlocked with an external contact and to disable opening/closing of the external contact by operating the operating section by using only one dedicated line.

[Disclosure of the invention]

The control panel of the present invention includes a changeover switch of the operation display section, an operation relay of the control section that is energized in half-wave on one side through a dedicated crossover wire when the first contact of the changeover switch is selected, and a control that responds to this operation relay. an electromagnetic contactor for controlling the load in the section, a signal receiving relay in the operation display section which is energized in half-wave on the other side through the dedicated crossover wire when the electromagnetic contactor for controlling the load is activated, and an operation display responsive to the signal receiving relay. an external contact that is attached to the control section and causes one-side half-wave current to be applied to the operating relay when closed when the second contact of the changeover switch is selected; and selection of the third contact of the changeover switch. In response to a one-sided half-wave current flowing from the control unit to the operation display unit through the dedicated crossover wire when the external contact is closed, one-sided half-wave current flows into the operation relay when the external contact is closed. The present invention is characterized in that it is configured to include a current limiting means of a control section that limits the current to a value smaller than the impressed current of the operation relay.

With this configuration, the control unit can be linked to the external contact simply by using one dedicated crossover wire, and opening/closing of the external contact can be disabled by operating the changeover switch on the operating unit. .

Examples of the present invention will be described below.

A first embodiment of this invention will be described based on FIG. This control panel uses a control section' and an operation display section'' in place of the control section and operation display section shown in Fig. 1.The electromagnetic contactor circuit of the control section' and the display circuit of the operation display section' are Since it is similar to FIG. 1, illustration is omitted.

In Figure 2, when the changeover switch SW is set to the "test" position, the power terminal r → diode
D ₉ → Changeover switch SW → Dedicated line EL ₁ → Diode
D ₆ → Normally closed contact _y of relay Y ₁ → Diode D ₁ → Resistor R ₁ → Operation relay When X is energized and the normally open contact mc ₁ of the magnetic contactor MC is closed, the power terminal s → normally open contact mc ₁ → diode D ₂ → dedicated line EL ₁ →
Diode D ₅ → Signal receiving relay Z → Power terminal r
The other half-wave is energized through the path, and the signal receiving relay Z is energized.

When the selector switch SW is set to the "auto" position,
When external contact k is closed, power terminal r → external contact k → diode D ₇ → normally closed contact y ₁ → diode D ₁ → resistor R ₁ → operating relay X → normally closed contact alx ₄ →
A half-wave current flows on one side in the path of the power terminal s, and the operation relay _X is energized. Due to the excitation of the operation relay ₁ → Diode D ₂ → Dedicated line EL ₁ →
Diode D ₅ → Signal receiving relay Z → Power terminal r
The other half-wave is energized through the path, and the signal receiving relay Z is energized. After that, when external contact k is opened,
The half-wave energization on one side is stopped and the excitation of the operating relay X is stopped, and therefore the half-wave energization on the other side is stopped and the excitation of the signal receiving relay Z is stopped.

When external contact k is closed, thermal relay TR trips and alarm relay ALX is activated.
When is energized, normally open contact alx ₂ closes and flicker relay FCR is activated, normally open contact alx ₃ closes,
Since the normally open contact fcr of the flicker relay FCR opens and closes, the other side is intermittently energized in half-wave. alarm relay
ALX's normally closed contact ALX ₄ is used to prevent operation relay X from flickering.

When the changeover switch SW is set to the "off" position, one-side half-wave energization is cut off, the excitation of the operation relay X is stopped, and therefore the excitation of the signal reception relay Z is stopped. At this time, when external contact k is closed, power terminal r → external contact k → diode D ₇ → relay Y
→ Changeover switch SW → Diode D ₈ → Power supply terminal s
A current flows through the path and the normally closed contact _y1 is opened, and no current flows through the operation relay X, so the electromagnetic contactor MC and the signal receiving relay Z are not excited. In other words, no matter what state the external contact k is in, if the changeover switch SW is set to the "off" position, the excitation of the operation relay
Excitation of MC and signal receiving relay Z will be stopped. In this case, relay Y and its normally closed contact _y1 constitute current limiting means as defined in the claims. _C3 is a capacitor similar to capacitors _C1 and _C2 .

As a result of this configuration, the control unit' can be controlled by the external contact k using only one dedicated line _EL1 .

A second embodiment of the invention will be described based on FIG. This control panel consists of the operation display section' shown in Figure 2.
An operation display section is used instead of the operation display section.The operation display section consists of a stop switch STO, a run switch STA, and a diode _D10 connected in series in place of the diode _D9 in Fig. 2, and a signal reception relay connected to the run switch STA. A normally open contact Z ₃ connected in parallel is used.

In this way, the changeover switch shown in Fig.
The SW "test" position becomes the "manual operation" position. That is, when the operation switch STA is closed, one half-wave current is applied through the stop switch STO, operation switch STA, diode _D10 , and changeover switch SW, the operation relay X is energized, the magnetic contactor MC is energized, and the normally open state is activated. Closing of contact mc ₁ performs half-wave energization on the other side, energizing signal receiving relay Z, and closing normally open contact z ₃ to put the circuit in a self-holding state. When the stop switch STO is opened, half-wave energization on one side is stopped, and therefore half-wave energization on the other side is stopped, and self-holding is canceled.

Other configurations and effects are similar to those of the first embodiment.

A third embodiment of the invention will be described based on FIG. 4. This control panel uses a control section and an operation display section in place of the control section 'and operation display section' in the second embodiment. In other words, the signal reception relay Z in the second embodiment is replaced by two It is replaced by photocouplers PC ₁ , PC ₂ and two switching transistors Q ₁ , Q ₂ and a resistor R ₂ .
Photocoupler PC ₁ controls the display DP, and photocoupler PC ₂ is for self-maintenance of the circuit. Further, the relay Y is replaced with a photocoupler PC ₃ , resistors R ₃ and R ₄ and a switching transistor Q ₃ . moreover,
The flicker relay FCR is replaced with a non-contact type periodic disconnection means (for example, an astable multivibrator) MV, a photocoupler PC ₄ and a switching transistor Q ₄ . Note that EE is a DC power supply circuit, D ₁₁ ,
_D12 is a diode.

This control panel operates in the same manner as in the second embodiment, except that the periodic disconnection means MV is always in operation.

The effect is similar to the second embodiment.

A fourth embodiment of this invention will be described based on FIG. This control panel uses a control section and an operation display section in place of the control section and operation display section shown in FIG. Although illustrations of the electromagnetic contactor circuit and the indicator circuit are omitted, they are the same as in FIG. 1.

This will be explained in more detail below. Changeover switch SW
When set to "test" position, power terminal r → diode D ₉ → resistor R ₅ → changeover switch SW → dedicated line
EL ₁ → NC side of switching contact alx ₁ → diode D ₁ → operation _relay Closed, power supply terminal s → normally open contact mc ₁ → diode D ₂ → dedicated line EL ₁ → diode
The other half-wave is energized along the path D ₅ → signal receiving relay Z → power supply terminal r, and the signal receiving relay Z is excited.

When the selector switch SW is set to the "auto" position,
When external contact k is closed, power terminal r → external contact k → diode D ₁₃ → resistor R ₆ → switching contact alx ₁
One side half-wave energization is performed in the path of NC side → diode D ₁ → operation relay X → power supply terminal s, and therefore half-wave energization is performed on the other side. External contact k
When opened, half-wave energization on one side stops, and therefore half-wave energization on the other side also stops.

When the changeover switch SW is set to the "off" position, even if external contact k is closed and half-wave energization is performed on one side and the other side, power terminal r → external contact k → diode D ₁₃ → resistor R ₆ →NC side of switching contact alx ₁ →
Even if half-wave energization is performed on one side in the path of diode D ₁ → operating relay X → power terminal s, the voltage between both ends of operating relay Diode D ₁₃ → Resistor
R ₆ → Dedicated line EL ₁ → Changeover switch SW → Diode
D ₈ → The flow switches to the path of power terminal s, so
The excitation of the operation relay X is stopped, and therefore the excitation of the electromagnetic contactor MC is stopped, and the excitation of the signal reception relay Z is stopped.

In this case, the resistor _R6 constitutes current limiting means as defined in the claims.

This embodiment can realize the same function with a simpler circuit configuration than the first embodiment.

〔Effect of the invention〕

The control panel of the present invention has the advantage that by only using one dedicated line, the control section can be linked to the external contact, and opening/closing of the external contact can be disabled by operating the operating section.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a control panel that is the basis of this invention, Fig. 2 is a circuit diagram of a first embodiment of this invention,
FIG. 3 is a circuit diagram of the second embodiment of this invention;
The figure is a circuit diagram of a third embodiment of the invention, and FIG. 5 is a circuit diagram of a fourth embodiment of the invention. ′,,...control unit, ′,″,,...
…Operation display unit, X…Operation relay, x ₁ …Normally open contact, MC…Magnetic contactor, mc ₁ …Normally open contact,
TR...Thermal relay, tr...Switching contact, ALX
...Alarm relay, FCR...Flash relay,
fcr...Normally open contact, Z...Signal receiving relay, STA
...operation switch, STO...stop switch,
CL ₁ , CL ₂ ... Common line, EL ₁ ... Dedicated line, RL...
Operation indicator lamp, GL...stop indicator lamp, D ₁ ,
_D13 ...Diode, _R6 ...Resistor.

Claims (1)

[Claims] 1. A changeover switch in the operation display section, an operation relay in the control section that is energized in half-wave on one side through a dedicated crossover wire when the first contact of this changeover switch is selected, and a load control electromagnetic circuit in the control section that responds to this operation relay. a contactor, a signal receiving relay of an operation display unit that is energized in a half-wave on the other side through the dedicated crossover wire when the load control electromagnetic contactor is activated, and a display of the operation display unit that responds to the signal reception relay; an external contact that is attached to the control section and causes one side half-wave current to be applied to the operation relay when closed when the second contact of the changeover switch is selected; When the external contact is closed, one side half-wave current flows into the operation relay from the control unit through the dedicated crossover wire in response to the one-side half-wave current flowing into the operation display unit. A control panel comprising a current limiting means of a control section that limits the current to a value smaller than the current.