Section IV. MAINTENANCE OF THE CAPACITANCE PROXIMITY SENSOR

Trouble

Probable Cause

Corrective action

Small animals contacting protected

Correct as appropriate to facility.

equipment.

Protected equipment not soundly

Check to be sure insulating blocks are

insulated from ground.

installed and have not become

unsound

Intermittent tamper false alarms.

Sensor cable intermittently open or

Inspect sensor cable, repair as

shorted

necessary, or replace.

Tamper switch in CPS enclosure loose

Secure tamper switch.

on mounting.

Tamper alarm not effective for one or

Connection to Item(s) of equipment

Repair sensor cable connection(s) to

more items of equipment, operational

open.

appropriate item(s) of equipment.

for others.

No tamper alarm, proximity alarm

Tamper alarm line shorted

Troubleshoot alarm wiring

normal.

Change setting of sensitivity switch.

No proximity alarm, tamper alarm

Sensitivity switch set wrong.

Remove one or more items of

normal.

Excessive

total

capacitance

equipment from protection circuit.

protected equipment.

Troubleshoot alarm wiring

Proximity alarm line shorted.

Section IV. MAINTENANCE OF THE CAPACITANCE PROXIMITY SENSOR

7-8. General

This section provides instructions for maintenance functions authorized to direct support maintenance personnel by the

maintenance allocation chart (Appendix B).

7-9. Circuit Card

a. Removal.

(1) Turn off power to the equipment, open the enclosure, tag and disconnect wiring from TB1 and TB2.

(2) Tag and remove the tamper switch leads from the circuit card (9, fig. C-1).

(3) Remove four screws (2) and washers (3 and 4).

Remove circuit card (9), from the enclosure.

b. Installation.

(1) Install circuit card (9) in the enclosure and secure with four screws (2) and washers (3 and 4).

(2) Install the tamper switch leads to circuit card (9).

(3) Connect wires to TB1 and TB2. Close the enclosure and turn on power to the equipment.

7-10. Sensor Cable

a. Removal.

(1) Shut off main power to the unit.

(2) Open the CPS door.

(3) Disconnect the cable center conductor and ground shield from TB2-1 and -2 respectively.

(4) Slip the cable through the cable hole.

b. Installation.

(1) Install the end of the sensor cable through the cable hole on the CPS enclosure.

(2) Connect the cable center connector to TB2-1 and the cable ground shield to TB2-2.

(3) Close the CPS door.

(4) Turn on power to the unit.

7-11. Tamper Switch

a. Removal.

(1) Shut off main power to the unit.

(2) Open the CPS door.

(3) Tag and disconnect the two leads from the rear terminals of tamper switch (7, Figure C-1).

(4) Remove two screws (5) securing switch (7) to the enclosure being careful to retain the two washers (6)

between the switch (7) and the edge of the enclosure.

b. lnstallation.

(1)Place two washers (6, Figure C-1)between the switch (7) and the edge of the enclosure.

(2) Install two screws (5) and secure switch (7) to the enclosure.

(3) Connect the two leads from the circuit card (9) to the rear terminals of switch (7).

(4) Close the CPS door.

(5) Turn on main power to the unit.

7-2