Operating instructions
65
O The gateway has no supply
or has a poor connection.
- Check that the connectors are
well connected to the gateway.
- Energize the power module.
Red ashing Communication error. Re-initialise the supply to the
power module.
Red continuous The gateway has detected
an error that makes any
communication impossible.
- Check that the control
potentio-meters on the
communication gateway are set
to their original control.
- Re-initialise the supply to the
power module.
Green ashing Network connected. No
communication in progress.
Operation is normal.
Green continuous Communication in progress. As above.
The operating status of the variable-frequency drive can
be seen on the status LEDs on the front face of the power
module on the control interface board. The LEDs are
located on each rectifier and chopper control board.
The chopper status diagnostics are quickly carried out by
checking the corresponding status LEDs:
Green Flashing 12 V supply present. Ready to operate.
Continuous 12 V supply present. Operating.
Yellow Flashing The variable-frequency drive is not ready to start,
as PIC shutdown command is present.
Continuous An alarm is present: check the return of the
variable-frequency drive status on the ICVC.
Red Flashing A fault is present: check the return of the
variable-frequency drive status on the ICVC.
Continuous A fault is present that cannot be reset: check the
return of the variable-frequency drive status on
the ICVC.
Chopper: red
Rectier: green
Continuous The thyristor control circuit of the variable-frequency
drives has opened after a safety pressure switch
fault.
If there is a more general fault that affects the rectifier and
the chopper, the status diagnostics are displayed as shown
in the table below:
Red-green Alternate
ashing
The rmware may be corrupt. Contact Carrier
Service.
Yellow/green/red Flashing,
repeating
pattern
RAM fault or the rmware may be corrupt.
Contact Carrier Service.
13.5.1 - Safety shutdown
The controlled safety shutdowns initiate a decreasing
voltage/frequency ramp until the motor shuts down.
In addition to shutdowns initiated as standard by the
machine, certain specific component faults are likely to
lead to a safety shutdown, if a variable-frequency drive as
used:
• Variable-frequency drive power fault
• Variable-frequency drive overheating
• Condensation formation on the cooling plate of the
variable-frequency drive
The faults detected in the variable-frequency drive can be
checked on the VFD_HIST screen of the ICVC.
13.5.2 - Emergency stop by the circuit breaker/main
disconnect switch
The emergency shutdown immediately opens the circuit
breaker/main disconnect switch. It can be initiated by
certain internal fault conditions at the variable-frequency
drive. Overvoltage faults on the power bus and earth current
leaks detected by the variable-frequency drive lead to an
emergency shutdown.
13.5.3 - Safety pressure switch cut-out
The opening of the safety pressure switch leads to the
disconnection of the 24 V power supply for the command
gates of the IGBT of the variable-frequency drive (Gate
Kill input on the power module): the motor shuts down
immediately following the power supply fault.