ABB ACS 400 - Page 136

ACS 400 User’s Manual 125
5 = DI5
Interlocks function is in use. Depending on the number of motors, the digital inputs are reserved for the
interlock signals according to the following table.
6 =
EXTERNAL IO
Interlocks function is in use. All interlock signals are taken through external I/O modules. Depending on the
number of motors, the digital inputs are reserved for the interlock signals according to the following table.
Interlock signals are active low, i.e. an interlock is active when the corresponding interlock signal is absent.
If a start command is given when the interlock signal of the speed regulated motor is active, the ACS 400
will not start, and will show alarm 30 (INTERLOCK) on the control panel.
Each Interlock circuit should be wired as follows:
1. A contact of the On/Off switch of the motor must be wired to the Interlock circuit. PFC logic detects if a
motor is switched off. The logic does not try to start the switched-off motor; the next available motor is
started instead.
2. A contact of the motor thermal relay (or another protective device in the motor circuit) must be wired to
the Interlock input. PFC logic detects if the thermal relay is activated. The motor is stopped.
Code Description
Interlock signals
No of aux. motors
(param. 8117)
ACS 400 digital
inputs
NDIO module 1 NDIO module 2
0 DI1-DI4: free
DI5: Motor 1
Not used Not used
1 DI1-DI4: free
DI5: Motor 1
DI1: Motor 2
DI2: Unused
Not used
2 DI1-DI4: free
DI5: Motor 1
DI1: Motor 2
DI2: Motor 3
Not used
3 DI1-DI4: free
DI5: Motor 1
DI1: Motor 2
DI2: Motor 3
DI1: Motor 4
DI2: Unused
Interlock signals
No of aux. Motors
(param. 8117)
ACS 400 digital
inputs
NDIO module 1 NDIO module 2
0 DI1-DI5: free DI1: Motor 1
DI2: Unused
Not used
1 DI1-DI5: free DI1: Motor 1
DI2: Motor 2
Not used
2 DI1-DI5: free DI1: Motor 1
DI2: Motor 2
DI1: Motor 3
DI2: Unused
3 DI1-DI5: free DI1: Motor 1
DI2: Motor 2
DI1: Motor 3
DI2: Motor 4
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