69
notes on module operation
1. The chiller operator monitors and modifies configura-
tions in the microprocessor by using the 4 softkeys and
the ICVC. Communications between the ICVC and the
CCM is accomplished through the SIO (Sensor Input/
Output) bus, which is a phone cable. The communication
between the CCM and VFD is accomplished through
the sensor bus, which is a 3-wire cable.
. If a green LED is on continuously, check the commu-
nication wiring. If a green LED is off, check the red
LED operation. If the red LED is normal, check the
module address switches (SW1). See Fig. 16. Confirm
all switches are in OFF position.
All system operating intelligence resides in the ICVC.
Some safety shutdown logic resides in the Gateway in
case communications are lost between VFD and ICVC.
Outputs are controlled by the CCM and VFD as well.
3. Power is supplied to the modules within the control
panel via the 4 V a.c. T1 and T transformers. The
transformers are located within the power panel. In
the power panel, T1 supplies power to the compressor
oil heater, and optional hot gas bypass, and T supplies
power to both the ICVC and CCM. T3 provides 4 V
power to the optional DataPort or DataLINK modules.
Power is connected to Plug J1 on each module.
Chiller Control Module (CCM) (Fig. 16)
Inputs
Each input channel has or 3 terminals. Refer to individual
chiller wiring diagrams for the correct terminal numbers
for a specific application.
outputs
Output is 4 V a.c. There are terminals per output. Refer
to the chiller wiring diagram for a specific application for
the correct terminal numbers.
8 - CONTROL MODULES
CAUTION: Turn controller power off before servicing
controls. This ensures safety and prevents damage to the
controller.
The ICVC and CCM modules perform continuous diagnos-
tic evaluations of the hardware to determine its condition.
Proper operation of all modules is indicated by LEDs (light-
emitting diodes) located on the circuit board of the ICVC
and CCM. There is one green LED located on the CCM
board, and one red LED located on the ICVC and CCM
boards respectively.
ReD LeD (Labeled as StAt)
If the red LED:
•
Blinks continuously at a -second interval, the module
is operating properly
•
Is lit continuously, there is most likely a hardware
fault that requires replacing the module
•
Is off continuously, the power should be checked
•
Blinks 3 times per second, a software error has been
discovered and the module must be replaced
If there is no input power, check the fuses and circuit breaker.
If the fuse is good, check for a shorted secondary of the
transformer or, if power is present to the module, replace
the module.
GReeD LeD (Labeled as CoM)
These LEDs indicate the communication status between
different parts of the controller and the network modules
and should blink continuously.
Inverter status light
COLOUR
STATE
DESCRIPTION
Green
Flashing
Drive ready, but not running and no faults are present.
Steady
Drive running, no faults are present.
Yellow
Flashing
The drive is not ready. A VFD start inhibit is in effect. Normal condition when chiller not running because the ICVC has
issued a stop command.
Steady
An alarm condition exits. Check VFD FAULT CODE in ICVC VFD_STAT screen.
Red
Flashing
A fault has occurred. Check VFD FAULT CODE in ICVC VFD_STAT screen.
Steady
A non-resettable fault has occurred. Check VFD FAULT CODE in ICVC VFD_STAT screen.
Red Inverter, Green Rectifier
Steady
VFD Gate Kill circuit has opened because the compressor high pressure switch has opened.
Rectifier status light
COLOUR
STATE
DESCRIPTION
Green
Flashing
Rectifier ready, but not running and no faults are present.
Steady
Rectifier running, no faults are present.
Yellow
Flashing
Rectifier is not ready. A VFD start inhibit is in effect. This is a normal state if the inverter is not running and/or the precharge
contacts are open.
Steady
Rectifier alarm condition exits. Check VFD FAULT CODE in ICVC VFD_STAT screen.
Red
Flashing
Rectifier fault has occurred. Check (VFD FAULT CODE in ICVC VFD_STAT screen.
Steady
A non-resettable fault has occurred. Check VFD FAULT CODE in ICVC VFD_STAT screen.
Red Inverter, Green Rectifier
Steady
VFD Gate Kill circuit has opened because the compressor high pressure switch has opened.
Inverter and rectifier control board failure status light patterns
COLOUR
DESCRIPTION
Red/Green Alternating
Control board application firmware may be corrupt. Call Carrier Service.
Yellow/Green/Red Repeating Pattern
Control board RAM failure or control board firmware may be corrupt. Call Carrier Service.
Table 13 - DPI Communications interface board status LEDs
