Parameter Range Default Notes
Note: No phase shift is allowed in the voltage transformer. That is, the phase angle must be
the same on the high and low voltage sides of the voltage measurement transformer.
Note: The minimum normal operating voltage for the controller is 100 V. However, this
range starts at 17 V to allow switchboard tests.
More information
See Wiring examples for controller functions, AC measurement wiring, [Source] AC configuration in the
Installation instructions for an example of generator voltage transformer wiring.
Current transformer
These parameters relate to the terminals on the ACM3.1. Configure these parameters under Configure > Parameters > [Source] >
AC setup > Current transformer.
CAUTION
Changing the current transformer settings, changes the protection range for the over-current and fast over-current
protections.
If you change the current transformer values and the set points for the over-current and fast over-current protections are out of the
set point range, then the Protection set point out of range alarm activates. The alarm action is warning, and cannot be configured.
You must set these parameters for the current transformer on the source's current measurement. These parameters only apply to
the current measurements on L1, L2 and L3.
More information
See the Installation instructions > Default wiring for controller types > ACM3.1 terminal connections and default
wiring for examples of generator current transformer wiring.
Parameter Range Default Notes
Primary 5 to 9000 A 1000 A The current transformer primary side (source side) nominal current.
Secondary 1 or 5 A 1 A
The current transformer secondary side (controller side) nominal current. You can select either
1 A or 5 A.
CT - ACM3.2 - Consumer side
Configure these parameters under Configure > Parameters > [Source] > AC setup > CT - ACM3.2 - Consumer side. These
parameters are only visible if you have an ACM3.2 installed.
More information
See the Installation instructions > Default wiring for the optional modules > ACM3.2 terminal connections and
default wiring for examples of generator current transformer wiring.
Parameter Range Default Notes
Primary 5 to 9000 A 1000 A
The current transformer primary side nominal current for terminals 1 to
6.
Secondary 1 or 5 A 1 A
The current transformer secondary side nominal current for terminals 1
to 6. You can select either 1 A or 5 A.
Current
reference dir.
• Towards prot. obj.
• Away from prot.
obj.
Towards prot.
obj.
Defines if the current transformer direction is installed towards or away
from the protected object for terminals 1 to 6.
Towards:
DESIGNER'S HANDBOOK 4189340911K UK Page 47 of 521
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