OPERATION SUMMARY - Section 3
3-28 MTS-3000 SERIES OPERATION AND REFERENCE MANUAL
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CU M004 01A
4.
Enable the AC outputs with the ENABLE switch. Press and hold FAULT. Increase the current output
with the MODIFY rotary knob until the relay operates. Note the current at that point and release
FAULT.
5.
The operate point can be checked dynamically by leaving the current amplitude adjustment at the same
point, and by pressing FAULT briefly only. This will latch on the current until it’s tripped by sensing
the relay operation. After recording the operate value, press RESET to restore normal operation.
3.3.10.5 TARGET TEST.
If the relay under test has a DC current-operated target, follow the procedure in the preceding section
3.3.9.5. Note that the accompanying differential relay drawing doesn’t show the current target coil and
contact, and the DC current capability is an optional feature of the DIGITAL I/O module.
3.3.11 Voltage Relay Test
FIGURE 3.18 VOLTAGE RELAY TEST
3.3.11.1 SETUP.
To test a single phase voltage relay, connect the test leads, as shown by the solid lines. A three-phase relay
or three single-phase devices on a relay panel require the additional connections shown as dashed lines. If
the relay requires auxiliary DC power, connect it as shown by the dotted lines. If there are more than a
single set of contacts provided (e.g. separate timed and instantaneous contacts), it will be necessary to
move the contact operation sensing leads to the appropriate terminals for the separate element tests. If three
voltage modules are not fitted, it will be necessary to move the Va output to the other phases in turn to
verify them.