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6.0
ADJUSTMENT AND MAINTENANCE
The proper adjustments to insure correct operation
of this relay have been made at the factory and
should not be disturbed after receipt by the cus-
tomer. If the adjustments have been changed, the
relay taken apart for repairs, or if it is desired to
check the adjustments at regular maintenance peri-
ods, the instructions below should be followed.
All contacts should be cleaned periodically. a con-
tact burnisher S# 182A836H01 is recommended for
the purpose. The use of abrasive material for clean-
ing contacts is not recommended because of the
danger of embedding small particles in the face of
the soft silver and thus impairing the contact.
6.1
Product Unit
6.1.1
Contacts
The index mark on the movement frame will coin-
cide with the "0" mark on the time dial when the sta-
tionary contact has moved through approximately
one-half of its normal deflection. Therefore, with the
stationary contact resting against the backstop, the
index mark is offset to the right of the "0" mark by
approximately.020". The placement of the various
time dial positions in line with the index mark will
give operating times as shown on the respective
time-current curves.
6.1.2
Minimum Trip Volt Amperes
Connect the relay per Figure 9. Set the time dial to
position 6. Using the lowest tap setting, alternately
apply tap value volt-amperes plus 3% and tap value
volt-amperes minus 3% with the current leading the
voltage by 30 ° . The moving contact should leave the
backstop at tap value plus 3% and should return to
the backstop at tap value minus 3%. The relay
should be calibrated with 10 times tap value at the
number six time dial position. Check several points
on the typical time curves. Time curve calibration is
affected by adjusting the position of the permanent
magnet keeper. Note that with current leading volt-
age by 30 degrees the actual watts applied to the
relay are.866 time tap value at pickup.
6.2
Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts
of the ICS. This value of current should not be
greater than the particular ICS tap setting being
used. The indicator target should drop freely.
6.3
Current Coil Ratings:
A.
20-120 Watt Range
35-200 Watt Range
B.
100-600 Watt Range
175-1000 Watt Range
7.0
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.
41-241.3L
Continuous
1Sec.
5 Amperes
230 Amperes
8 Amperes 370 Amperes
5
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