4T-V0-SF-1Q-EN
41
Communication Loss
Yes
Yes
No
Yes
No
No
Yes
No
Scan to see a
video on the
Communications
Troubleshooting
Drive SW or HW
issue: Replace
Drive
Power Applied to Unit but no
Comm LED
Check and Record CDA Status -
Powered/Not Powered
Measure DC Bus Voltage with
multimeter (+VDC to -VDC)
Power Off 2 min (need to wait to
completely bleed off voltage for
true reset) and then Power On
Is DCV > 240VDC?
First time
through process?
Check Supply Voltage at Board
(Use connector points at top of board.)
Is Vsupply between
170 and 253VAC?
Remove power and isolate all
external sensors. Disconnect HPCO,
J1, CDA, LSOV, EEV and PWM.
Reapply power.
LEDs
lighting
Replace
Drive
Identify and
repair shorted
circuit/component
Check upstream
At Disconnect
Breaker.
No LEDs are lighting:
Status and Comm
Scan to see a
video on how to
replace the IVSC
+VDC
-VDC
ELECTRICAL
HAZARD
Failure to follow this
warning could result in
personal injury or death.
WAIT TWO (2) MINUTES
after disconnecting power
prior to touching electrical
components as they may
hold a dangerous charge
of 400VDC, then verify DC
Voltage is less than 42 VDC
at inverter test points
lVDC and -VDC
before servicing board.
400 VOLTS
WARNING