Troubleshooting With Circuit Diagram - Husqvarna 967187001 Workshop Manual

CST-drive mode logging
12.6 Troubleshooting with Circuit
Diagram
1
A brown lead runs from CCU connector C:7 to
one pole of the switching relay coil. On the other
side of the relay coil is a gray lead running to the
single-action power relay coil. On the other side of
the coil on the single-action relay is a brown lead
running to the drive motor.
When activating with the key switch, relay RE2 will
be energized while the drive motor receives a volt-
age on A:11 (key switch). After about 500 ms, the
drive motor will couple an output voltage on A:11
(Main Relay). After pressing the start button, CCU
C:7 (main relay) is coupled to GND and then relay
RE1 is energized.
If this circuit does not function, any messages
received from the test with CST must first be read.
If the machine is activated with Manual Drive Mode
Logging with the following results:
Main relay circuit on = green
Main relay circuit status = green
Main relay circuit fault status = green
Then the output inside CCU is activated OK.
The circuit being OK depends on the drive motor
being OK and sending voltage on its brown lead
for activating the power relay and the switching
relay is activated by turning the key to ON.
GND
36V from keys witch when on
+36V from motor
500mS after key switch ON
118
English –
RE2
GND via CCU
Alternating power relay and this
relay is activated with the key switch
RE1
Main relay
This relay is activated by the CCU and drive motor
if the alternating relay is activated
Connector C at CCU
C7: Main relay ON/OFF