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117
GND
GND
Drive motor
+36V from key switch
36+V from motor
500mS after key switch on
Main relay
Free wheeling diodes
Alternating power relay
GND via CCU
Connector at CCU
C7: Main relay on/off
Key switch to motor
Key switch to CCU
3
1
4
5
2
6
7
8
RE2
POWER RELAY
1
2
3
4
RE1
MAIN RELAY
SW_KEY
KEY
2
1
FU
5A
D1
DIODE
M
BATT+
D1
BATT-
D2
Main contactor
A10
Key switch
A11
Enable input
A5
Forward/Backwa
A6
Dynamic Brake
A7
Speed IN 0-4,5V
A2
0V REF
A9
Temp sensor
A4
Speed feedback
A1
NC
A8
Error out
A3
Analog 0V REF
A12
DRIVE MOTOR
CCU
CCT001
MAIN RELAY
D2
DIODE
+36V
CCU +36V IN
ALTERNATING
START
ACTIVATE
START_SW
+5V OUT
12.5 Electrical Circuit Diagram
The key switch is always supplied with +36 V
from the batteries via a 5 A fuse. When the key is
turned to the on position, R2 will be activated and
energized, and the gray lead, pin 7, is coupled to
the brown lead, pin 6 via the relay while CCU is
supplied with power. When the driver presses the
activation switch (I), the CCU output (Main Re-
lay) couples the brown lead to GND (shown with
switch function to GND in figure) to activate relay
RE1. The motor control electronics sends +36 V
via Main Relay output A10 (brown lead from drive
motor). This voltage arrives about 500 ms after
the motor has received power via the key, which
energizes RE1 and the machine is activated. Both
these relays have a freewheeling diode across its
coil (D1 and D2 in figure below), the CCU unit is
able to handle relay without freewheeling diode but
not the electronics inside the drive motor. These
diodes are therefore very important, and if they dis-
appear of their leads break, the drive motor elec-
tronics will be damaged. Inside CCU are a number
of functions so that a fault on the output driving the
relay can be seen. The output is short-circuit proof
and CCU can detect if the output is short circuited.
The output can also indicate a break in the lead
out to the relay, so that CCU can send a fault indi-
cation to CST. This is so that the test can show if
there is a fault, break or short circuit.
CST-drive mode logging
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