13
1.3
Functions
1.3.1
Main Current Outputs
The main output on the 200A-3PH mk2 is used to inject current into test object to determine
operating (set
ting) levels and trip times. The outputs are taken from the ‘main output’ terminal
groups, and are switched on and off using the “OUTPUT ON” and “OUTPUT OFF”
pushbuttons, and the voltages of each phase (and hence current) are set using the “A”, “B”,
and “C” control knobs.
The main current output of the unit consists of three independent, isolated outputs derived
from the three phase mains supply. The phase difference between the outputs is therefore
fixed.
Each of the main outputs allows voltage output of 0-5 Vac. The ratings are shown in the table
below.
Voltage range
Current rating
Continuous
5min on/15 off
1min on/15 off
0-5V
50A
100A
200A
A true RMS ammeter with 20, 50, 100 and 200A ranges meters the output current. The meter
range is totally independent of the output tap, allowing any metering range to be used with
either of the output taps. It is always best to start by connecting the device under test (as
shown in Figure 1.2), and select the lowest current metering range that includes the desired
test current.
Figure 1.2 Example connection
Device under test
