T&R Z-OVR, Operating And Maintenance Manual

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1.2.5 Overload protection
Location Protection
Mains supply Hydraulic-magnetic circuit breaker
Control unit output Hydraulic-magnetic circuit breaker
Control unit control/metering T4A HRC 32mm fuse
Voltage input 2xT250mA HRC 32mm fuses
1.3 Functions
1.3.1 Output
The output has three ranges. The highest currents are available on the lowest voltage outputs.
When testing, start with the lowest output voltage output. If the required test current cannot be
achieved (because the impedance of the line is high) use a higher voltage output.
Output unit
Open Circuit
Voltage
Continuous
current
Intermittent current
5 min on/
15 min off
Maximum
current
NLU75/80
75V 40A 80A 100A*
150V 20A 40A 40A
300V 10A 20A 20A
*100A available for short periods
Each output is rated for a continuous current and 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:
Figure 1.8 Output tripped
!
NOTE
If the metering cable is not connected between the control unit and the external
output 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 output unit acts as an interlock circuit.
Output tripped
Press Green to Reset