OPERATION SUMMARY - Section 3
3-26 MTS-3000 SERIES OPERATION AND REFERENCE MANUAL
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CU M004 01A
Selecting slope display mode forces the CM to display the % slope, operate current, and restraint current
on the second and third line of the CM. The phase angle of Ib also will change to 0
°.
2.
Disable the outputs, if necessary, by pressing ENABLE until its LED is out, and press FAULT. Its LED
will come on.
3.
Select the A phase of the current output module by pressing the F1 key on the module. Its LED will
come on and a cursor will flash slowly beneath the ‘A’ representing Amps in the F1 line of the
module’s display.
4.
Enter the desired nominal Ia (restraint) current via the MODIFY keypad or rotary knob.
5.
Select the B phase of the current output module by pressing the F2 key on the module, and enter the
desired nominal restraint current via the MODIFY keyboard or rotary knob.
6.
Press the F2 key of the current module again to select phase angle adjustment on B phase, indicated by
a flashing cursor beneath the
°
symbol.
7.
Adjust the phase angle on channel B, as required, via the MODIFY keyboard or rotary knob. The angle
is usually set to 0
°
, but may be displaced by +/- 30( for relays protecting wye-delta transformers.
8.
Enable the outputs by pressing ENABLE. Press and hold FAULT. Select IB for amplitude adjustment,
and then slowly lower the Ib current by rotating the MODIFY knob counterclockwise until the relay
begins to operate. The LED indicator on INPUT 1 of the DIGITAL I/O module will light, and the
audible tone, if enabled via the tone switch, will sound. The current may be adjusted up or down via
the MODIFY knob to verify the pickup level.
Note the calculated values of slope, operate current and restraint current are displayed on the 2nd and 3rd
line of the CM display.
9.
Release the FAULT button when the test is complete.
10. To repeat for different values of restraint current, repeat the above process.
3.3.10.2 OPERATE TIME TEST.
1.
Set up the MTS, as described above, with sufficient operate current to trip the relay at the desired level
of restraint current. Release the FAULT button.
2.
With the AC outputs enabled (ENABLE LED lit) and the trip indication (if any) cleared by pressing
RESET, press FAULT momentarily to enter Dynamic Fault Mode. The AC outputs will be latched on
until the relay operates. The TRIP signal from the relay will force a state change from FAULT to
POSTFAULT causing the TRIP LED to be lit, the timer and AC readings to be frozen, and the AC
outputs to be disabled.
3.
Record the timer reading from the first line on the Control Module display. Press RESET to restore the
system operation.