You must set these parameters if you do not want the AC measurements that the controller uses for the alarms to be phase-to-
phase. These parameters determines whether the controller uses phase-to-phase or phase-to-neutral voltages.
Measurements from the neutral line can be present for phase-to-phase measurements.
Parameter Range Default Notes
AC setup
• Phase-
phase
• Phase-
neutral
Phase-
phase
Phase-phase: The controller uses the phase-to-phase voltages for the alarms (that is,
L1-L2, L2-L3, and L3-L1). See the Installation instructions for a wiring examples
for a phase-to-phase AC configuration.
Phase-neutral: The controller uses the phase-to-neutral voltages for the alarms (that is,
L1-N, L2-N, and L3-N). Measurements from the neutral line must be present in a phase-
to-neutral system.
If you select Single-phase L1 (or L2 or L3), you must also select Phase-neutral.
More information
See Wiring for examples controller functions, AC measurement wiring, System AC configuration in the Installation
instructions for an example of wiring required for the phase-to-neutral voltage measurements.
INFO
This parameter does not affect the nominal voltages. The nominal voltages are always phase-to-phase voltages.
Phase direction: AC phase rotation
Configure this parameter under Configure > Parameters > [Source] > AC setup > Phase direction.
You must set this parameter if the AC phase rotation is not L1-L2-L3.
This parameter must be the same in all the controllers in the system.
Parameter
Range Default Notes
AC phase
rotation
• L1-L2-L3
• L1-L3-L2
L1-L2-L3
L1-L2-L3: The global standard phase rotation is L1-L2-L3. Using an alternative
wiring can lead to confusion, fatal accidents and serious damage to equipment.
L1
L2 L3
Voltage
[V]
Time [s]
L1-L3-L2: DEIF does not recommend that you wire the system L1-L3-L2, due to
the potential for confusion. However, this parameter allows the controller to
function correctly even though the generator is wired L1-L3-L2.
DESIGNER'S HANDBOOK 4189340911K UK Page 45 of 521
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