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GEK-1253E
SETTINGS
Cup Unit (PFD)
*
The CHCIIA relay has been tested at the factory.
The pickup of the cup (PFD)
unit has been set at 2.0 amperes phase-to-phase.
This pickup may be set at a
higher value by loosening the hexagonal control-spring-locking screw and rotating
the control-spring adjuster in a counterclockwise direction until the desired
phase-to-phase pickup is obtained.
It is only necessary to set pickup for one pair
of phases.
Figure BA shows the connections necessary to do this.
After the pickup
has been set, make sure the spring-adjusting ring is set back as far as possible
into the molded spring-adjusting-ring housing before tightening the hexagonal lock
screw.
Hinged-Armature Unit (GFD)
When the relay was tested at the factory, the pickup of the hinged-armature
unit was set at its minimum value; i.e., the top of the hexagonal adjustable core
was lined up with the lowest calibration mark.
The pickup-current levels for this
unit are stamped beside each calibration mark.
To increase the current at which the hinged-armature unit picks up, loosen the
locking nut and then rotate the adjustable core in a counterclockwise direction.
After the top of the hexagonal head core is at the des ired ca 1 i brat i on mark, the
final core adjustment may be made, using the test connections shown in Figure BB.
Tighten the locking nut, being sure not to turn the adjustable core.
If the external reactor supplied with the relay is used, as shown in Figure
11, the pickup of the GFD unit will be approximately 40% higher than indicated by
the calibration points marked at the factory.
Target Units (Tl and T2)
The electrically operated target units have two taps, 0.2 and 2.0 amperes.
The relay is shipped with the tap screws in the 2.0 ampere tap.
The applicable tap
must be selected, and the tap screw placed in that tap.
Tap screws should not be
in both taps at the same time.
Auxiliary Relay (A)
Connected from the auxiliary relay contacts to either terminal 19 or 20, is a
red jumper 1 ead .
Th
i
s 1 ead can be connected to either termi na 1 to obta ina
normally-open or a normally-closed contact.
As shipped from the factory, the red
lead is connected to terminal 19, to give a normally-open contact between terminals
19 and 20.
LOCATION AND MOUNTING
The location should be clean and dry, free from dust and excessive vibration,
and well lighted to facilitate inspection and testing.
*
Revised since last issue
9
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