OM Centrif Micro ΙΙ-5 93
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
LED #
NAME
INDICATION
LEDC1
Watch Dog/Power
Fail/Reset
On when reset/CPU failure/control voltage
failure.
LEDC2
Control power
On if control voltage is present.
NS
DeviceNet Network Status
See DeviceNet manual.
Computer
MS
DeviceNet Module Status
See DeviceNet manual.
DE
Data Enable
On when card is transmitting data.
TXD
Transmit Data
On when card is transmitting data.
RXD
Receive Data
On when card is receiving data.
LED1
Operation
Flashes when card is operating.
Local I/O
Controller Card
LED2
Communication
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.
Power
LEDP1
LEDP2
LEDP3
SCR Status
Run - LEDs must be fully off or the SCR is open
or misfiring.
L1 - L6
Condition of SCR’s
L1 and L2 - SCR’s A and B
L3 and L4 - SCR’s C and D
L5 and L6 - SCR’s E and F
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.
Pulse Generator
A - F
SCR gate voltage
These LEDs will be on, while ramping, to
indicate that gate power is reaching the SCR’s.
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.
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