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RELAY
PMA OR PMA-1
PMD OR PMD-1
†
PM-5
PMG-13 OR PM-13
PM-23 OR PM-2 & PM-3
†
Same relay as for three-terminal lines.
‡
These are pilot-wire current values.
PMA OR PMA-1
PMD OR PMD-1
†
PM-5
PMG-13 OR PM-13
PM-23 OR PM-2 & PM-3
†
Same relay as for two-terminal lines.
‡
These are pilot-wire current values.
5.1.
PM-4, PM-2, and PM-23 Relays
Adjust the resistors in the PM-4, PM-2, or PM-23
relay or relays to a value of 1 mA dc with the monitor-
ing circuits connected for service. Use the milliam-
meter in the PM-23 for this purpose or use a portable
milliammeter with a resistance of less than 200
ohms. Where it is not practical no three-terminal lines
to adjust both receiving relays simultaneously, set
one receiving relay for 18,000 ohms total resistance
(including relay coil and resistors) by measurement
prior to final adjustment of the other receiving relay.
This procedure will minimize the change in monitor-
ing current in the first relay to be adjusted when mak-
ing the final adjustment of the second relay.
5.2.
PMA, PMA-1, PMG-13 and PM-13 Relays
Select the transformer tap nearest to expected nor-
mal ac supply voltage. The full wave rectifier is con-
nected to a secondary transformer tap. Where
desired, the output voltage can be raised about 5%
by reconnecting across the full secondary winding.
Courtesy of NationalSwitchgear.com
NOMINAL CALIBRATION VALUES - TWO TERMINAL LINE
LOW CURRENT ALARM
0.65 mA
0.65
-
0.65
†
0.65
NOMINAL CALIBRATION VALUES - THREE TERMINAL LINES
RELAY
LOW CURRENT ALARM
†
Table 4:
1
HIGH CURRENT ALARM
‡
1
2
Table 5:
HIGH CURRENT ALARM
1.7 mA
1.7
-
‡
1.7
0.65
5.3.
Indicating Contactor Switch
No setting is required on the ICS unit except the
selection of the 0.2 or 2.0 ampere tap setting. This
selection is made by connecting the lead located in
front of the tap block to the desired setting by means
of the connecting screw. When the relay energizes a
type WL relay switch, or equivalent, use the 0.2
ampere tap.
6.
INSTALLATION
The relays should be mounted on switchboard pan-
els or their equivalent in a location free from dirt,
moisture, excessive vibration, and heat. Mount the
relay vertically by means of the four mounting holes
on the flange for semi-flush mounting or by means of
the rear mounting stud or studs for projection mount-
ing. Either a mounting stud or the mounting screws
may be utilized for grounding the relay. The electrical
connections may be made directly to the terminals by
means of screws for steel panel mounting or to the
terminal studs furnished with the relay for thick panel
mounting. The terminal studs may be easily removed
I.L. 41-973.5Q
2
TRIP
1.3 mA
-
1.3
-
±0.3
-
14 V
‡
1.3
14 V
-
Left-hand Contact
Right-hand Contact
TRIP
2.3 mA
-
2.3
-
±0.3
-
‡
14 V
2.3
14 V
-
7
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