ABB CA-16, Instruction Leaflet

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41-337.31 C
6
current can best be determined with the permanent
magnet removed.
Adjust the spring tension until t he relay just closes its
contacts with the following current applied to termi-
nals 12 and 13 of the relay.
CA-16 0.15 amperes
7.3. Percentage Slope Characteristic
Connect the relay per the test circuit of Figure 8.
Pass 20 amperes for the CA-16 relay into terminals 9
and 19 of the relay. Adjust the plug (when used) in
the operating electromagnet until the contacts just
close with the following currents into the operating
circuit of the relays.
CA-16 29.4 to 34 amperes
7.4. Time Curve
Place the permanent magnet on the relay and apply 20
amperes to terminals 12 and 13 of the relay. Adjust the
keeper of the permanent magnet until the contacts just
close in the following times:
CA-16 58 to 68 Milliseconds
These times should be the average of 5 readings.
7.5. Indicating Contactor Switch (ICS)
Initially adjust unit on the pedestal so that armature fin-
gers do not touch the yoke in the reset position.
(Viewed from top of switch between cover and frame).
This can be done by loosening the mounting screw in
the molded pedestal and moving the ICS in the down-
ward position.
a. Contact Wipe – Adjust the stationary contact 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.
b. Target – Manually raise the moving contacts and
check to see that the target drops at the same
time as the contacts make or 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.
If the pickup is low, the front cover must be removed
and the leaf springs on each side bent outward
equally.
7.6. Sensitive Fault Detector
Loosen the lock nut at the top of the element and run
the core screw down until it is flush with the top of the
lock nut. Back off the Micarta disc by loosening the
two lock nuts. Apply 0.15 amperes to terminals 14
and 15. Operate the moving element by hand and
allow the current to hold the moving contact disc
against the stationary contacts. Now, screw up the
core screw slowly. This causes the plunger to move
up, compressing the spring until a point of maximum
deflection is reached. Further upward motion will
cause the plunger to drop part way out of the coil,
thus diminishing the spring pressure on the contacts.
By thus adjusting the core screw up or down the
maximum spring deflection for this value of current
may be found.
Then lock the core screw in place. Next, adjust the
de-energized position of the plunger by raising the
Micarta disc until the plunger just picks up electrically
at the 0.15 ampere value.
7.7. Electrical Checkpoints
Figures 9 and 10 will aid in trouble shooting the
CA-16. These curves show the operating current to
trip the relay for different restraint current for one
restraint element as well as for six restraint elements
connected in series.
8.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.