OPERATION SUMMARY - Section 3
3-38 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
1. If you haven’t done so, perform steps 1-4 of Section 3.3.13.1.
2. Select
Φ
-N/A-N fault mode. If the [MODE/MENU DISPLAY] doesn’t show, VOLTS in the upper left
corner, press [VOLTAGE].
3. Turn the [MODIFY] knob to lower Va (3rd-harmonic) until the relay operates. When the relay contacts
close, the [TONE] button will light. If the audible stop trigger tone has been enabled (by pressing the
[TONE] button), the tone also will sound.
4.
Change the fault mode to
Φ
-N/C-N. Adjust the inhibit voltage lower until the relay restrains to find the
threshold for the inhibit element.
3.3.14 Frequency Relay Test
3.3.14.1 PICKUP TEST.
To check the pickup level of an over/underfrequency element:
1. The test connections are the same as those for a voltage relay (see Figure 3.6). Select
Φ
-N/A-N fault
mode. If more than 150V is required, connect the relay across A-B, and select
2
Φ
-N/A-B fault mode.
2. Press [STATIC/DYNAMIC], as required, to select STATIC operation mode.
3. Press [FREQ] once or twice, as required, to toggle the frequency reference mode from line to variable.
The annunciation in the upper right of the [MODE/MENU DISPLAY] will change from “LINE” to a
specific frequency (defaults to your system frequency 60.000Hz or 50.000Hz).
4. Press [VOLTAGE] to display/adjust voltage. Turn [PREFAULT] on, and set the desired prefault
voltage.
5. Press and hold [FAULT], or short the [EXTERNAL START] contact inputs. This holds the MTS-1710
in the fault state, indicated by the illuminated [FAULT] button.
6. Turn the [MODIFY] knob to adjust the voltage for the fault state (generally the same as prefault).
7. Press [FREQ] to display/adjust frequency. Turn the [MODIFY] knob to adjust the frequency for the
fault state. When the relay contacts close, the [TONE] button will light. If the audible stop trigger tone
has been enabled (by pressing the [TONE] button), the tone also will sound. The frequency may be
adjusted, as required, to determine the pickup level.
8. Release the [FAULT] button, and remove connections to the [EXTERNAL START] inputs.
3.3.14.2 TIMING TEST.
To check the operation time of an over/underfrequency element:
1. If you haven’t done so, perform steps 1-4 of the pickup check above.
2. Press and hold [FAULT], or short the [EXTERNAL START] contact inputs. This holds the MTS-1710
in the fault state, indicated by the illuminated [FAULT] button.
3. Turn the [MODIFY] knob to adjust the voltage for the fault state (generally the same as prefault).
4. Press [FREQ] to display/adjust frequency. Set the desired fault frequency.
5. Release the [FAULT] button, and remove connections to the [EXTERNAL START] inputs.
6. Turn the [MODIFY] knob to set a specific prefault frequency if desired.
7. Press [STATIC/DYNAMIC] to select DYNAMIC operation mode. Press [FAULT] to initiate.
8. When the relay operates, the [STOP/RESET] button will illuminate. Press [TIME] to read the operate
time. Press [TIME] again to toggle between time in seconds/cycles. Press [STOP/RESET] to return to
the prefault state, and to prepare for the next test.