Powertronix Quasar Service Manual page 94

Test Procedures
7.
Note: An in situ test for a short circuit IGBT can be carried out at this point
8.
9.
10.
11.
IGBT fitting is the reverse of the removal procedure refer to
nector location.
Table 7-6 Inverter IGBT Gate Drive Connectors
Converter IGBT (Q4) Removal
1.
2.
3.
4.
5.
6.
7.
8.
Note: An in situ test for a short circuit IGBT can be carried out at this point
9.
10.
11.
12.
IGBT fitting is the reverse of the removal procedure refer to
nector location.
Table 7-7 Converter IGBT Gate Drive Connectors
7 - 18
Disconnect the cables attached to current transformer TA1 TA2 and TA3 IGBT connection
extension pillars and lift off the CT's.
before the devices are removed.
Disconnect the gate drive fast on connectors from the IGBT's and note their position for
re assembly.
Remove the four retaining IGBT securing Allen screws from each IGBT and remove each
IGBT.
Test each IGBT for serviceability follow the IGBT test procedure on
Replace any components found defective.
IGBT Connector
Q1 J11
Q2 J9
Q3 J11
Power down the UPS and carry out the DC bus discharge routine.
Gain access to the UPS power section by removing the top and side covers.
Disconnect and remove the Inverter driver/feedback PCB Part NºOSDE0071. Follow the
procedure on page 7 32.
Remove the converter bus bar retaining screws from IGBT Terminal 2 and 4.
Remove capacitors C9 and C10 from the bus bars.
Remover the connecting screws from diodes CD4 and CD5
Remove the bus bar retaining screws from the insulated pillar.
Slacken the converter current transformer (TA4) mounting bolt securing the CT and bus bar,
and reposition to gain access to Q4.
before the devices are removed.
Disconnect the gate drive fast on connectors from the IGBT and note their position for
re assembly.
Remove the four retaining IGBT securing Allen screws and remove from IGBT from the
heatsink.
Carry out a test of the IGBT for serviceability follow the IGBT test procedure on
Replace IGBT if found defective.
IGBT
Q4
Service Manual
Table 7-6
IGBT Gate Lead Terminal
4
Red Black
Blue Black
Red Black
Table 7-7
IGBT Gate Lead Terminal
3 5
Red Black
page 7 20.
for correct IGBT gate drive con
5 7
Black
Black
Black
page 7
for correct IGBT gate drive con
3x3 UPS
Issue 2 - November 2001
6
Red
Blue
Red
20.