Powertronix Quasar Service Manual page 107

Service Manual
14.
15.
16.
Replacing the PCB
1.
Important
All replacement PCB's leave the manufacturer pre calibrated therefore no adjustment
should be necessary.
note
2.
Link and Jumper functions
3.
Bypass Voltage Threshold Adjustment
4.
3x3 UPS
Issue 2 - November 2001
Remove the terminal screws and wires from the static switch SCRs.
a) N7, N8 & N9 Note: N8 has two Red wires attached.
b) N11, N12 & N13 Note: N12 has a Black wire attached.
c) N15, N16 & N17 Note: N16 has a Brown wire attached.
Remove the PCB Earth terminal screw N20.
Remove the remaining PCB retaining screw from the mounting pillar and carefully lift the
PCB from the unit feeding the gate drive lead connectors through the PCB cut outs.
Replace the Inverter Driver/Feedback PCB using the opposite sequence to the removal.
When fitting a replacement PCB the on board links must be checked to ensure they are in
the correct position.
a) J4A J5A sets the DC Bus voltage.
375V (
750V (normal operation.)
b) JIA J2A J3A sets the UPS nominal bypass voltage;
Carry out the Inverter and Converter functional test outlined on page 7-15.
a) P1 = adjusts the maximum bypass voltage threshold (+10%)
b) P2 = adjusts the minimum bypass voltage threshold ( 10%)
Refit all covers removed and return the UPS to its normal operating condition.
DC V/Link
s
ervice maintenance mode)
Link 380V
J1A close
J2A open
J3A open
PCB Replacement Procedures
J4A J5A
close close
open open
400V 415V
open open
close open
open close
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