Led Diagnostics; Preventive Maintenance - McQuay WSC Operating Manual

LED Diagnostics

There are several LEDs located on the Micro II circuit cards. These LEDs can be used to help
troubleshoot problems with the starter. Refer to the circuit card layouts for LED locations.
Table 46, LED Diagnostics
CARD
Computer
Local I/O
Controller Card
Power
Pulse Generator

Preventive Maintenance

During Commissioning
• Torque all power connections during commissioning, including pre-wired equipment.
• Check all control wiring for loose connections.
• If fans are installed, check for proper operation.
One Month After Commissioning
• Re-torque all power connections, including pre-wired equipment.
• If fans are installed, check for proper operation.
After First Month of Operation
• Re-torque all power connections, including pre-wired equipment annually.
• Clean accumulated dust with clean compressed air.
• Inspect cooling fans, if present, every three months.
• Clean or replace air vent filters every three months.
OM Centrif Micro ΙΙ-5
LED # NAME
Watch Dog/Power
LEDC1
Fail/Reset
LEDC2 Control power
NS DeviceNet Network Status
MS DeviceNet Module Status
DE Data Enable
TXD Transmit Data
RXD Receive Data
LED1 Operation
LED2 Communication
LEDP1
LEDP2 SCR Status
LEDP3
Condition of SCR's
L1 and L2 - SCR's A and B
L1 - L6
L3 and L4 - SCR's C and D
L5 and L6 - SCR's E and F
A - F SCR gate voltage
INDICATION
On when reset/CPU failure/control voltage
failure.
On if control voltage is present.
See DeviceNet manual.
See DeviceNet manual.
On when card is transmitting data.
On when card is transmitting data.
On when card is receiving data.
Flashes when card is operating.
On when valid data is received over the master
link.
Indicates forward SCR condition;
Stop - LEDs must be on or the SCR is shorted
Start - LEDs will become dimmer as motor
accelerates.
Run - LEDs must be fully off or the SCR is open
or misfiring.
Indicates SCR condition;
Stop - LEDs will be off when stopped.
Start - LEDs will be bright when the in-line is
energized. LED's will go progressively dimmer
as motor accelerates.
Run - LED's will be off when motor reaches full
voltage.
These LEDs will be on, while ramping, to
indicate that gate power is reaching the SCR's.
93