AMCI SD17040C User Manual - Page 13

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Indexer Problems

Symptom

My indexer/PLC reports a fault

from the SD17040C when every-

thing seems fine.

The motor is running faster/slower

than expected and/or the distance

traveled is farther/shorter than

expected.

Driver Problems

Symptom

Both LED's are off, and the Fault

Output is active. (Not conducting)

Power is applied to the driver.

Both LEDs are green, the Fault

Output is inactive, (conducting) but

the motor is not powered.

STEP/FAULT

The

blink when the indexer sends

pulses to the driver. The motor

does not turn.

STEP/FAULT

The

20 Gear Drive, Plymouth Ind. Park, Terryville, CT 06786

Tel: (860) 585-1254 Fax: (860) 584-1973 http://www.amci.com

TROUBLESHOOTING

Solution

Your logic may be reversed. On the SD17040C, the Fault Output is on (con-

ducts current) when the driver is working correctly and turns off (stops cur-

rent flow) when there is a fault with the driver. Therefore, losing power to the

driver appears as a fault. If you're expecting the fault output to turn on and

conduct current when there is a fault, then your logic is reversed.

Most likely a problem with the SD17040C's Step Resolution setting or the

indexer's programming. If the motor is running too fast, the Step Resolu-

tion on the SD17040C is set lower than the indexer's programmer

assumed it would. If the motor is running slow, the Step Resolution is set

higher than the indexer programmer assumed it would be.

Solution

1) The AC line voltage may be too low. It must be greater than 85Vac

for the SD17040C to operate properly.

2) One or both of the 10A fuses may be blown. These fuses will not

blow under normal circumstances, so call AMCI for assistance.

Blown fuses may be a sign of serious installation problems.

1) The ±Disable input may be active. The active state, (power applied

or power removed), is set by DIP switch SB1-4. This switch may be

set incorrectly.

2) The Idle Current Reduction may be set to its To 0% setting. With this

setting, current is removed from the motor if a directional pulse is not

received for one second.

LED does not

1) Verify that your two directional inputs on the Indexer Connector are

not swapped or cross-wired.

2) If the inputs are wired as a sinking or sourcing instead of differential,

verify that they are wired correctly. If your indexer has sourcing out-

puts, then the inputs of the SD17040C must be wired as sinking

inputs and vice versa.

LED is red.

The driver is experiencing a fault condition. All faults are latched, so

power must be cycled to the driver or the Disable Input must be toggled

before the fault will clear.

1) Over Temp Fault. Is the driver very hot? It shuts down when its

internal temperature exceeds 90°C (195°F).

2) Interlock Fault. The motor is not plugged into the driver or a wire

jumper was not installed between the two Interlock pins on the Motor

Connector.

3) Short in Motor. Shut off the SD17040C and disconnect the motor.

Pull back the rubber boot and verify the following with an ohmmeter.

a) Open circuit from "A+" to "B+" pins. (Tests for short between

b) Open circuit from "A+" to "Earth Ground" and "B+" to "Earth

If any of these readings is not an open circuit, then check your wiring.

The most common cause of a short between phases is cross-wiring

the phases when wiring the connector. If you see a phase-to-case

short, make sure you don't have a stray wire from the "B+" or "A-" ter-

minals hitting the Earth Ground terminal on the connector.

phases.)

Ground". (Tests for short between phase and case.)