Rockwell-automation 1391ES AC Servo Controller User Manual download pdf (Page 65)

Troubleshooting

Chapter 10

10-63

Table 10.A

LED Descriptions and Fault Diagnosis

LED

OVERTEMPERATURE

(RED)

Potential Cause

OVERTEMPERATURE LED is Illuminated

The logic supply (±12V DC, +5V DC) circuits have malfunctioned

(fuse blown etc.) or the AC input at TB4-19, 20, 21 is incorrectly wired.

The heat sink thermal overload has tripped. One or more of the

following may have occurred:

1. The cabinet ambient temperature is above rating.

2. The machine duty cycle requires an RMS current exceeding the

continuous rating of the controller.

3. The integral fan is not functioning.

4. The airflow access to the controller is limited or blocked.

LED Description

The controller contains a thermal

switch on the heat sink which

senses the power transistor

temperature. If the temperature is

exceeded the LED will illuminate.

CONTROL (POWER) FAULT LED is illuminated

1. Open or short circuit on resolver wiring.

2. The input line voltage is out of tolerance.

2. The transformer auxiliary logic supply winding is open.

3. The logic supply (±12V DC, +5V DC) circuits have malfunctioned

(fuse blown etc.) or the AC input at TB4-19, 20, 21 is incorrectly

wired.

A fault will occur and the LED will

illuminate, if:

1. The logic supply rises or drops

10% from its nominal value

2. The resolver wiring is open or

shorted.

POWER FAULT

(RED)

POWER FAULT LED is Illuminated

1. The current through any one of the power transistors has exceeded

300% of the controller’s current rating.

2. Malfunctioning power transistor.

3. Shorted Lead.

4. Winding to case motor capacitance is out of tolerance.

The current through the power

output transistors is monitored. If

the current exceeds a fixed level

(greater than 300% of controller

rating) the LED will illuminate.

CONTROL (POW-

ER) FAULT

(RED)

OVERVOLTAGE

(RED)

OVERVOLTAGE LED is illuminated

The logic supply (±12V DC, +5V DC) circuits have malfunctioned

(fuse blown etc.) or the AC input at TB4-19, 20, 21 is incorrectly wired.

The power bus voltage has exceeded 405V DC.

1. Logic Board is malfunctioning and incorrectly sensing the bus

voltage.

2. A vertical axis with insufficient counterbalancing is overdriving the

servomotor and causing excessive energy to be returned to the power

supply bus.

3. The system inertia is too high causing excessive energy to be

returned to the power supply bus.

4. Input line voltage exceeds the maximum controller input voltage

rating.

5. The position controller acceleration / deceleration rate is incorrectly

set.

6. The shunt regulator or transistor has malfunctioned.

7. Shunt regulator fuse has blown.

8. Shunt regulator resistor not connected to controller.

The DC Power Bus is continuously

monitored. If it exceeds a preset

level a fault is sensed, the power

supply is disabled and the LED is

illuminated.

UNDERVOLTAGE

(YELLOW)

UNDERVOLTAGE LED is illuminated

The power bus voltage has dropped below a preset DC value

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.

If the DC Power Bus drops below a

preset level, a fault occurs and the

LED is illuminated.

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Rockwell-automation 1391ES AC Servo Controller User Manual Page 65

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