T&R PCU1 Series, Operating And Maintenance Manual

Page: 15 / 48

15
1.3.2 Loading Unit Outputs
Each loading unit has two or three output taps. The highest currents are available on the
lowest voltage taps.
Loading
unit
Open
Circuit
Voltage
Continuous
current
Intermittent current
5 min on/
15 min off
1 min on/
15 min off
40s on/
15 min off
NLU5000
2.3V 1500A 3000A 4500A 5000A
4.6V 750A 1500A 2250A 2500A
9.2V 375A 750A 1125A 1250A
NLU2000
3.5V 600A 1200A 1800A 2000A
6.9V 300A 600A 900A 1000A
13.8V 150A 300A 450A 500A
NLU200
60V 40A 80A 160A 200A
120V 20A 40A 80A 100A
Each output is rated for a continuous current and also for higher intermittent currents. The
maximum ‘on’ time for intermittent currents is enforced by the unit, and the output will be
switched off if the rating is exceeded. The display will then show the following message until
the green ‘off’ button is pressed to clear the trip condition:
Output Tripped
Press Green to Reset
NOTE: If the metering cable is not connected between the control unit and the external loading unit,
the ammeter will not function and the output will not switch on when the output
ON push-
button is pressed. The metering cable between the control and external loading unit acts as
an interlock circuit.
The control unit automatically selects the correct metering ranges and protection for the
loading unit connected.