JPH10210797A - Operation device for power supply vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a voltage and frequency from being switched during operation and protect a load side apparatus from a damage, by a method wherein a voltage switching means and a frequency switching means are separated from a control power supply in accordance with an engine start command and, after the engine is stopped, a control power supply switch is opened once and then re-closed to be connected to the control power supply. SOLUTION: If a frequency or a generated voltage is changed after the start command of an engine is outputted, the engine is stopped and, after a control power supply 7 is cut off by a control power supply switch 6, the control power supply 7 is closed again by the control power supply switch 6 and the frequency or the voltage is changed to a required frequency or a required voltage. With this constitution, even if a voltage changeover switch 8 or a frequency changeover switch 13 are switched mistakenly, the voltage or the frequency is not changed and a load side apparatus can be protected from a damage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a power-supply vehicle, and more particularly, to preventing erroneous operation thereof.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a power supply vehicle, in which a generator 2 and an engine 3 for driving the generator 2 are mounted in a vehicle 1. To the load.

FIG. 4 is a circuit diagram of a conventional operation device for a power-supply vehicle. Reference numerals 4 and 5 denote control power sources 7 through a control power switch 6.
The power supply line 8 has switching contacts 8a and 8b,
Voltage changeover switches for switching the power generation voltage of the generator 2 to, for example, 200 V and 400 V, 9 and 10 are relays connected between the power supply lines 4 and 5 via the voltage changeover switch 8, respectively. The generated voltage is changed to 200 V and 4 by switching the voltage of the drive circuit of the generator 2 by excitation.
Switch to 00V. 9a and 10a are normally open contacts of relays 9 and 10, and 11 and 12 are normally open contacts 9a and 10a, respectively.
200V and 400 connected between power supply lines 4 and 5 via
V is a display section. Reference numeral 13 denotes switching contacts 13a, 13
b, and the power generation frequency of the generator 2 is, for example, 50 Hz and 6
Frequency changeover switch 14, 1 for switching to 0 Hz
Reference numeral 5 denotes a display unit connected between the power supply lines 4 and 5 via the frequency changeover switch 13, respectively. Reference numeral 13c denotes a normally open contact of the frequency changeover switch 13, and the normally open contact 13c is connected to the electronic governor controller 16. . The electronic governor controller 16 adjusts the power generation frequency by adjusting the fuel amount of the engine 3.
Adjust to 0 Hz, and adjust to 60 Hz when closed.

Next, the operation of the power-supply vehicle operating device having the above configuration will be described. First, when the power switch 6 is turned on, when the voltage changeover switch 8 is connected to the changeover contact 8a side, the relay 9 is excited, the generator 2 is in a state of generating a voltage of 200 V, and the normally open contact 9a Is closed, the display unit 11 displays 200 V power generation. When the frequency changeover switch 13 is connected to the changeover contact 13a,
The normally open contact 13c is turned off, and the voltage governor controller 16 adjusts the fuel amount of the engine 3 so that the power generation frequency becomes 50 Hz. The display unit 14 indicates that the power generation frequency is 50 Hz. When the engine 3 is started in this state, the generator 2 generates 50 V at 200 V.

Here, the voltage changeover switch 8 is switched to the changeover contact 8
When switching to the b side, the relay 10 is excited and the generator 2
Generates a voltage of 400 V by voltage switching or the like, and the display unit 12 displays the generation of 400 V by closing the normally open contact 10a. In addition, frequency changeover switch 1
3 is switched to the switching contact 13b side, the normally open contact 13c
Is closed, and the electronic governor controller 16 adjusts the fuel amount of the engine 3 so that the power generation frequency becomes 60 Hz.
The display unit 15 displays the power generation at 60 Hz.

[0006]

As described above, in the conventional power-supply vehicle operating device, the display units 11 and 12 display the voltages of 200 V and 400 V, and the display units 14 and 15 display the frequencies of 50 Hz and 60 Hz. The display is performed to prevent erroneous operation. However, if the changeover switches 8 and 13 are erroneously operated during operation, the voltage and frequency are switched, and there is a possibility that the load-side equipment may be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a power supply vehicle capable of preventing a switching operation of voltage and frequency during operation and preventing damage to load-side equipment. The aim is to obtain an operating device.

[0008]

An operation device for a power supply vehicle according to the present invention is connected to a control power supply via a control power supply switch and switches voltage generated by a generator.
A frequency switching means connected to the control power supply via the control power switch to switch the power generation frequency of the generator, a means for disconnecting the voltage switching means and the frequency switching means from the control power supply in response to an engine start command, and after stopping the engine A means is provided for connecting the voltage switching means and the frequency switching means to the control power supply by turning off and on the control power switch once.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a circuit diagram of an operating device of a power supply vehicle according to this embodiment, wherein 17 is a timed voltage relay which is connected between the power supply lines 4 and 5 and which is turned off, for example, 0.5 seconds after being energized, 18 is a timed A voltage auxiliary relay 19 is connected between the power supply lines 4 and 5 via the normally closed contact 17a of the voltage relay 17, and 19 is connected in series with the normally open contact 18a of the voltage auxiliary relay 18 and the switching auxiliary relay 20 between the power supply lines 4 and 5. Normally closed contact of the auxiliary relay for engine start command connected to the
20c is a normally open contact of the switching auxiliary relay 20, and the normally open contact 20a is connected in parallel with the normally open contact 18a.

The normally open contact 20b is connected between the power supply lines 4 and 5 in series with the voltage changeover switch 8 and the switching auxiliary relay 21. The switching auxiliary relay 21 is connected to the closing portion 21-1 connected to the switching contact 8a and the switching contact. Tripping part 21 connected to 8b
-2. Reference numerals 21a and 21b denote normally open contacts and normally closed contacts of the switching auxiliary relay 21. Reference numeral 22 denotes a 200V / 400V switching contactor, which is connected between the power lines 4 and 5 in series with the normally open contact 21a. It has a trip unit 22-2 that is a switching unit to the 400V side and is connected in series with the unit 22-1 and the normally closed contact 21b. Reference numerals 22a and 22b denote normally open contacts and normally closed contacts of the switching contactor 22, which are connected in series between the display units 11 and 12 and the power supply lines 4 and 5.
Reference numeral 23 denotes a frequency switching auxiliary relay connected in series with the normally open contact 20c and the frequency switch 13 between the power supply lines 4 and 5, and a closing unit 23- connected to the switching contact 13a.
1 and a trip portion 23-2 connected to the switching contact 13b. Reference numerals 23a and 23b denote normally open contacts and normally closed contacts of the switching auxiliary relay 23, which are connected in series between the display units 14 and 15 and the power supply lines 4 and 5, respectively. Reference numeral 23c denotes a normally open contact of the switching auxiliary relay 23, which is connected to the electronic governor controller 16;
Adjusts the power generation frequency to 50 Hz when the normally open contact 23c is closed, and to 60 Hz when the normally open contact 23c is opened.

The switching auxiliary relays 21 and 23 and the switching contactor 22 use a keep relay here. For example, in the switching auxiliary relay 21, the closing part 21-1 is selected and its contacts 21a and 21b are closed. In this state, even if the contact 20b is opened and the switching auxiliary relay 21 is de-energized, the contacts 21a and 21b are maintained in the closed state. The detachment of the contacts 21a and 21b is performed when the switching auxiliary relay 21 is biased toward the trip portion 21-2. The same applies to the switching contactor 22 and the switching auxiliary relay 23.

Next, the operation of the power vehicle operating device having the above configuration will be described with reference to the flowchart of FIG. First, when the control power switch 6 is turned on in Step 1, the voltage auxiliary relay 18 is excited in Step 2, the normally open contact 18a is turned on in Step 3, the switching auxiliary relay 20 is excited in Step 4, and Steps 5 to 7 are performed. Then each normally open contact 20
a to 20c are turned on. As a result, the switching auxiliary relay 2
0 is held by the normally open contact 20a (step 12). On the other hand, in step 8, the timed voltage relay 17 is excited in response to the turning on of the control power switch 6, and
Then, the normally closed contact 17a is turned off after a predetermined time, for example, 0.5 seconds. In step 10, the voltage auxiliary relay 18 is demagnetized, and in step 11, the normally open contact 18a is turned off.

In step 13, when the normally open contact 20b is turned on, the voltage switching circuit becomes operable. That is, for example, when the voltage switch 8 is switched to the switching contact 8a side, the closing part 21-1 of the switching auxiliary relay 21 is excited,
The normally open contact 21a is closed, and the closing part 2 of the switching contactor 22 is closed.
2-1 is also excited. As a result, the power generation voltage of the generator 2 is switched to 200 V, and the display unit 11 operates by displaying the normally open contact 22 a to close to display 200 V power generation. When the voltage changeover switch 8 is switched to the changeover contact 8b side, the trip portions 21-2 and 22-2 are energized and the normally open contacts 21a and 22a fall off, and the operation for 400V side changeover is performed.

In step 14, when the normally open contact 20c is turned on to switch the frequency changeover switch 13 to the changeover contact 13a, the closing portion 23-1 of the switching auxiliary relay 23 is excited, the normally open contact 23c is turned on, and the electronic governor is turned on. The operation of the controller 16 switches the power generation frequency to 50 Hz. At the same time, the display unit 1 is closed by closing the normally open contact 23a.
4 operates and displays 50 Hz. When the frequency changeover switch 13 is switched to the changeover contact 13b side, the trip portion 23-2 is urged, and the frequency is switched to 60 Hz by the separation of the normally open contacts 23a and 23c.

In step 15, the switching operation is completed. In step 16, it is determined whether or not a start command has been given to the start circuit of the engine 3.
, The normally closed contact 19 is turned off, and in step 18, the switching auxiliary relay 20 is demagnetized. As a result, steps 19 to
At 21, the normally open contacts 20a to 20c are turned off. At step 22, the self-holding of the switching auxiliary relay 20 is released.
In steps 23 and 24, the switching auxiliary relays 21 and 23 and the switching contactor 2 in the voltage switching circuit and the frequency switching circuit
2 are demagnetized, but the normally open contacts 21a, 22
Since a, 23a, and 23c are maintained in the on state as they are, they are operated with a power generation output of 200 V and 50 Hz.

When the frequency or the generated voltage changes after the output of the engine start command, the engine 3 is stopped, the control power supply 7 is turned off by the switch 6, and the control power supply 7 is turned on again by the switch 6. It is sufficient to switch to the desired frequency or voltage side in the same manner as described above.

In the above embodiment, the power generation voltage and the power generation voltage are not changed until the engine start command is issued after the control power supply 7 is turned on.
Although the power generation frequency can be switched, it cannot be switched thereafter. To enable the switching again, it is necessary to stop the engine 3 and then turn off the control power switch 6 once and then turn it on again. For this reason, even if the changeover switches 8 and 13 are erroneously switched during power generation, the voltage and frequency are not switched, and damage to the load-side devices can be prevented.

[0018]

As described above, according to the present invention, the switching of the power generation voltage or the power generation frequency is possible between the time when the control power is turned on and the time when the engine start command is issued, and thereafter it becomes impossible. Therefore, it is necessary to stop the engine, turn off the control power switch once, and then turn it on again. Therefore, during operation of the engine, that is, during power generation, it is not possible to switch the voltage and the frequency, and it is possible to prevent the load-side equipment from being damaged.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an operating device of a power supply vehicle according to the present invention.

FIG. 2 is a flowchart showing the operation of the power vehicle operating device according to the present invention.

FIG. 3 is a side view of the power supply vehicle.

FIG. 4 is a circuit diagram of a conventional device.

[Description of Signs] 1 ... Vehicle 2 ... Generator 3 ... Engine 6 ... Control power switch 7 ... Control power supply 8 ... Voltage change switch 13 ... Frequency change switch 16 ... Electronic governor controller 17,18,20,21,23 ... Relay 19: normally closed contact 22: switching contactor

Claims (1)

[Claims] 1. A power supply vehicle in which a generator and an engine for driving the generator are mounted on a vehicle, a voltage switching means connected to a control power supply via a control power switch to switch a generation voltage of the generator, and a control power supply. Frequency switching means connected via a control power switch for switching the power generation frequency of the generator, means for disconnecting the voltage switching means and the frequency switching means from the control power supply in response to an engine start command, and a control power switch after stopping the engine A power supply vehicle operating device, comprising means for connecting the voltage switching means and the frequency switching means to a control power supply by turning off and on the power supply once.