Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 99)

Chapter 11
Troubleshooting
11-5
Table 11.A
LED Fault Diagnostics
Enable Enable LED is NOT Illuminated
1. The position controller has not enabled the drive.
2. The Enable wiring to the drive is open.
3. The position controller Enable relay/switch has malfunctioned.
4. The position controller has detected a machine system malfunction that will not
allow the drives to be Enabled.
5. Power has not been applied to input transformer.
6. The logic supply (
±
12V DC) circuits have malfunctioned (fuse blown etc.) or the
AC input at TB4-19, 21 is incorrectly wired or missing.
Enable LED is Illuminated, but drive does not Enable
1. A drive malfunction has occurred but is not annunciated by the LED indicators.
Check the status of the Drive OK output (DROK) relay.
2. A component malfunction exists in the Enable circuit.
3. The circuit breaker (MCB) is tripped.
4. The power contactor has not been energized or has malfunctioned.
5. Motor cables removed.
The drive logic supplies are not operational
1. The logic supply fuses are blown
2. Logic supply AC voltage is missing
3. A drive malfunction has occurred but is not annunciated by the LED indicators
(check the status of the Drive OK contacts).
The application of an Enable signal
by the machine position controller
will cause the ENABLE LED to
illuminate.
1. System fault has occurred.
2. Power was applied while the drive was enabled. Remove enable and reapply
power.
1. The power contactor (M) has not energized or has dropped out.
2. The input line voltage is low.
3. The shunt regulator circuit has malfunctioned and is placing the shunt resistor
across the power bus.
4. The power bus capacitor has malfunctioned.
5. The circuit breaker (MCB) has tripped.
6. The three-phase input line is open.
7. Transformer is supplying the wrong line voltage or has malfunctioned.
Status Status LED is flashing red.
This LED is green until a system
fault occurs. The LED will flash
green when bus voltage is not
present (DROK open).
If the DC Power Bus drops
below a preset level the DROK
contact will open if parameter
130 is set to 1.