Inverter Drive Signal Testing - Powertronix Quasar Service Manual

Test Procedures

7.8.6 - Inverter Drive Signal Testing

Equipment required
To carry out test.
Figure 7-15 Test Lead connection
Test cable +ve
Battery Fuse
Holders
To Battery String
7 - 26
a) (DC) Power Supply greater than 350Volts (Battery string)
b) Oscilloscope (Isolated or in Differential mode)
c) Linking Wire.
d) Cable with 8 Pin Amphinol style connector or two compatible insulated connectors
1. Turn of unit and wait for the DC Bus Voltage to decay
2. Select a battery string and remove the wire from the output side of it's fuse holder.
3. Insulate the end of this wire.
4. Remove connector PM1 from the Auxiliary Converter board Part Nº OSDE0070.
5. Connect the test cable positive to the Battery Fuse holder selected.
6. Connect the test cable negative to the battery common negative rail.
7. Remove the remaining fuses from the other battery fuse holders if fitted.
8. Connect the test lead Amphinol connector to PM1 on the Auxiliary Converter PCB Connect
the Negative to the rearmost pin and positive to the front most pin.
9. Close links J5 & J4 on the Control Logic PCB Part Nº OSDE0072.
10. Fit a wire link from Test Point TP30 to capacitor C30 (side nearest to IC U12.) on the Control
Logic PCB (This forces a mains OK signal)
11. Close the selected battery fuse.
12. Wait for the UPS to initialise.
13. Press the inverter ON OFF push button.
14. Check the inverter IGBT gate drive PWM signals at the appropriate connectors J9, J11 and
J12, on the Inverter Driver/Feedback PCB Part Nº OSDE0071.
15. On completion of the test press the inverter ON OFF push button to stop the inverter.
16. Open the battery fuse allow the DC bus to discharge.
17. Remove all test links and cables, and restore all the original connections.
18. Return the machine to normal operating condition.
Amphenol Connector
connect to PM1
Test cable ve
6mm Ring Tab
Battery ve common
Service Manual
Rear Pin
Front Pin
Auxiliary Converter board Part Nº OSDE0070
3x3 UPS
Issue 2 - November 2001