ABB CA-16 Памятка по эксплуатации - Страница 6

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41-337.31B

(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

Courtesy of NationalSwitchgear.com

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.