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in the molded pedestal and moving the ICS in the
downward direction.
1. Contact Wipe. Adjust the stationary contacts
so that both stationary contacts make with
the moving contacts simultaneously and
wipe 1/64" to 3/64" when the armature is
against the core.
2. Target. Manually raise the moving contacts
and check to see that the target drops at the
same time as the contacts make or up to
1/16" ahead. The cover may be removed
and the tab holding the target reformed
slightly if necessary. However, care should
be exercised so that the target will not drop
with a slight jar.
3. Pickup. Unit should pickup at 98% of rating
and not pickup at 85% of rating. If necessary
the cover leaf springs may be adjusted. To
lower the pickup current use a tweezer or
similar tool and squeeze each leaf spring
approximately equal by applying the tweezer
between the leaf spring and the front surface
of the cover at the bottom of the lower win-
dow.
If the pickup is low, the front cover must be
removed and the leaf springs bent outward
equally.
H. Compensator Check
Accuracy of the mutual impedance T of the com-
pensators is set within very close tolerances at fac-
tory and should not change under normal
conditions. The mutual impedance of the compen-
sators can be checked with accurate instruments
by the procedure outlined below:
1. Set T
on the 15.8 tap
A
T
on the 5.1 tap
C
2. Disconnect the L-leads of sections M
M
C
3. Pass 10 amperes ac current in terminal 9
and out of terminal 8.
4. Measure the compensator voltage with an
accurate high resistance voltmeter (5000
ohms/volt).
5. Compensator A-voltage should be checked
between lead L
A
For T
= 15.8 the voltage measured should
A
be 23.7 volts (±3%).
6. Compensator C voltage should be checked
between lead L
the resistor which is mounted in the rear.
For T
= 5.1, the voltage should be 76.5
C
volts (±3%).
7. For all other taps the compensator voltage is
1.5IT (±3%).
Where I = relay current
T = tap setting
9. RENEWAL PARTS
Repair work can be done and the relay recertified
most satisfactorily at the factory. However, inter-
changeable parts can be furnished to the custom-
ers who are equipped for doing repair work. When
ordering parts, always give the complete name-
plate data. Note that replacement parts are not
"certified" and repair work done outside the factory
can not be certified by ABB.
41-748.21C
A
and terminal 5.
and the fixed terminal on
C
and
17
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