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74 The control unit
Default I/O diagram of the supply control unit (BCU-x2)
The diagram below shows the default I/O connections on the supply control unit (A51),
and describes the use of the connections in the supply unit. Under normal
circumstances, the factory-made wiring should not be changed.
The wire size accepted by all screw terminals (for both stranded and solid wire) is
2
0.5 ... 2.5 mm
(22 ... 12 AWG). The tightening torque is 0.45 N·m (4 lbf·in).
Terminal
XD2D
1
B
1
2
2
A
3
3
BGND
4
4
Shield
D2D.TERM
X485
5
B
5
6
6
A
7
7
BGND
8
8
Shield
XRO1, XRO2, XRO3
11
NC
11
12
COM
12
13
NO
13
21
NC
21
22
22
COM
23
23
NO
31
31
NC
32
32
COM
33
33
NO
XSTO, XSTO OUT
1
OUT
1
2
SGND
2
3
IN1
3
4
4
IN2
5
5
IN1
6
6
SGND
7
7
IN2
8
8
SGND
XDI
Description
Drive-to-drive link
Not in use by default
Drive-to-drive link termination switch
RS485 connection
Cooling fan monitoring (CIO module)
Relay outputs
Norm. closed
Common
Norm. open
Norm. closed
Common
Norm. open
Norm. closed
Common
Norm. open
4)
Safe torque off
XSTO: Factory connection. Both circuits (power module, control unit) must
be closed for the supply unit to start (IN1 and IN2 must be connected to
OUT).
XSTO OUT: Not in use.
Digital inputs
1)
2)
XRO1: Charging
(Energized = Closes
charging contactor.)
250 V AC / 30 V DC, 2 A
3)
XRO2: Fault (-1)
(Energized = Indicates
no fault.)
250 V AC / 30 V DC, 2 A
2)
XRO3: MCB ctrl
(Energized = Closes
main contactor/breaker.)
250 V AC / 30 V DC, 2 A
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