© Ernst Nagel GmbH 2S Trimmer Service Manual en.doc Rev.1.0. 20.07.2011
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Contents
5. Troubleshooting
(continued)
5.3 Fault Code Solutions
(continued)
STR 021
Motor7 Pulse Timeout
Procedure
STR 022
Motor7 Cycle Timeout
•
Go
to
STR 024 – Motor7 Open Circuit
Warning : Fault code STR021 can be caused by a NVM 2 Infeed Position that is to high.
Enter the Service mode and select Motor7 encoder A in sensors. Slowly rotate the motor by hand and check the value on the display.
Value toggles between “0” and “1”?
Y N
Disconnect the sensor plug to Motor7 (STR-Motor7). Measure between the two wires for the sensor (5V and Signal ground).
The voltage is approximately 5VDC?
Y N
Check
wires
for
damage.
Are the wires damaged?
Y N
Go to
STR 023 Motor 7 Short Circuit
Replace
wire
Harness
Replace
Sensor
Enter the Service mode and select Motor7 encoder B in sensors. Slowly rotate the motor by hand and check the value on the display.
Value toggles between “0” and “1”?
Y N
Disconnect the sensor plug to Motor7 (STR-Motor7). Measure between the two wires for the sensor (5V and Signal ground).
The voltage is approximately 5VDC?
Y N
Check
wires
for
damage.
Are the wires damaged?
Y N
Go to
STR 023 Motor 7 Short Circuit
Replace
wire
Harness
Replace
Sensor
Enter service mode and start Motor7.
The motor starts?
Y N
Go
to
STR 024 Motor 7 Open Circuit
Check for obstructions
