System Configuration
The Unipower HPL110A measures voltage in all three legs of the 3-phase supply (or one
leg and neutral for single phase versions) and current in one leg. The HPL110A has an
internal current transformer with a measurement range of 8 Amps.
In configuring the HPL110A for a particular application, the voltage rating of the unit
must match the mains supply being used and the effective current measured by the unit
must be within its internal 8 Amp capacity.
4.1 VOLTAGE MATCHING:
From Table 4.1, ensure that the rated voltage for the HPL110A unit matches the mains
voltage being used.
For single phase applications, an isolation transformer must always be used with a
secondary voltage of 24V.
Note:
The display full scale for the HPL110A is based on the nominal voltage of the unit;
e.g. when using a nominal 220V unit at 208V, the display range will read 95% at full load
(208/220 in %).
4.2 CURRENT MATCHING:
From the motor name plate, note the full load current in Amps. If full load amperage for
the motor is 8 amps or less, an external current transformer is not required.
If the full load current is greater than 8 amps, then an external N/1 or N/5 current
transformer must be used.
Refer to Table 4.2 for the appropriate selection of current transformer and current range
setting for the HPL110A.
The HF3A current transformers specified in this table are low voltage, through-primary
devices offered as accessories for the HPL110A product line; equivalent devices from other
manufacturers may be substituted at user’s discretion.
8
Catalog Number
Phase
Use for 50/60 Hz Mains Voltages
HPL110/220
3-Phase
208/220/230/240 VAC
HPL110/380
3-Phase
380/415 VAC
HPL110/460
3-Phase
460/480 VAC
HPL110/575
3-Phase
575/600 VAC
HPL110A/S24
1-Phase
110/120 and 208/220/230/240 VAC
F i g u re 4 . 1
4
