36 Planning – additional instructions
Connecting the Ready and Start enable signals
All drives which you connect to the AC power line must be ready (charging complete)
before you can start to load any of the drives. If a drive on the common DC system starts
its motor too early, it can cause damage to the charging contactor or resistor.
To make sure that starting is not possible during the charging:
1. Connect the Ready signals of all drives with the AC power line connection in series
and supply the circuit with +24 V from one drive. This becomes the common Ready
signal for all drives.
Note: Relay output RO1 of the drive indicates the Ready signal in ACS880 primary
control program when the Factory macro is selected. If you have another macro or
control program in use, or want to use another relay output instead, see the drive
firmware manual for the parameter settings (parameter group 10 Standard DI, RO).
2. Connect the common Ready signal to digital input DI6 of all drives.
3. Connect the ground of the 24 V DC supply in all drives to each other (DICOM
terminals in ZCU control unit). We also recommend that you separate it from the digital
I/O ground (DIOGND terminal) in all drives. (Switch J6 in ZCU control unit.)
4. Set the digital input DI6 as the source for the Start enable signal in the drive control
program in all drives. (parameter 20.19 Enable start command in the ACS880 primary
control program.)
The diagram below shows the control connections with a solid line.
3
2
XD24
1
2
3
DIIL
+24V
DICOM
XRO1
1
2
3NO
COM
NC
ZCU
Control unit
M
~3
3
2 2
J6: OFF
M
~3
3
M
~3
3
XDI
6DI6
XD24
1
2
3
DIIL
+24V
DICOM
XRO1
1
2
3NO
COM
NC
ZCU
Control unit
J6: OFF
XDI
6DI6
XD24
1
2
3
DIIL
+24V
DICOM
XRO1
1
2
3NO
COM
NC
ZCU
Control unit
J6: OFF
XDI
6DI6
3
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