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Type PM Line of Relays For Pilot Wire Monitoring
And Transferred Tripping
Turn the shunts all the way in, then back them out
five turns each. With the relay connected as shown in
the left-hand column of the table, apply rated voltage
to the relay and adjust the 50,000 ohm resistor for
0.3 mA dc. Now following the procedure in the previ-
ous paragraph for the PM-5 relay, adjust the shunts
until the left-hand contact closes at 0.3 mA dc.
Change the connections as indicated in the right-
hand column, and adjust the opposite shunt until the
right-hand contact closes. Recheck back and forth
several times and make necessary trimming adjust-
ments to obtain pickup at 0.3 mA in each direction.
The armature will move gradually as the current is
changed for this relay unit.
9.1.10 ICS Unit
Close the main relay tripping contact circuit with a
jumper connected directly across the contact termi-
nals of the polar unit. Pass sufficient direct current
through the relay trip circuit to close the contacts of
the ICS unit. This value of current should not be
greater than the ICS tap setting being used (0.2 or
2.0). The indicator target should drop freely. The con-
tact gap should be approximately 0.047 inch
between the bridging moving contact and the adjust-
able stationary contacts. The bridging moving con-
tact
should
touch
simultaneously.
10.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
41-973.5R
both
stationary
contacts
13
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