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13
TROUBLESHOOTING
Indexer Problems
Driver Problems
Symptom
Solution
My indexer/PLC reports a fault
from the SD17040C when every-
thing seems fine.
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.
The motor is running faster/slower
than expected and/or the distance
traveled is farther/shorter than
expected.
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.
Symptom
Solution
Both LED’s are off, and the Fault
Output is active. (Not conducting)
Power is applied to the driver.
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.
Both LEDs are green, the Fault
Output is inactive, (conducting) but
the motor is not powered.
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.
The
STEP/FAULT
LED does not
blink when the indexer sends
pulses to the driver. The motor
does not turn.
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.
The
STEP/FAULT
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
phases.)
b) Open circuit from “A+” to “Earth Ground” and “B+” to “Earth
Ground”. (Tests for short between phase and case.)
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.
Summary of Contents for SD17040C
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