Section III. PRELIMINARY CHECK OF EQUIPMENT

Section III. PRELIMINARY CHECK OF EQUIPMENT

NOTE

A good sensor cable (as determined by an ohmmeter check, if

necessary) properly terminated must be connected to the CPS

before the following equipment check can be made.

2-10. Preliminary Steps

a. Request the Control Unit operator to apply power to the CPS and notify him that tests are being conducted.

Make sure that personnel are clear of the equipment protected by the CPS.

b. Using a screwdriver, open the front cover. A tamper alarm should be received immediately at the Control Unit.

c. Disconnect the alarm wires from terminals 1, 2, 5, and 6 of TB1. Continuous capacitance proximity and tamper

alarms should be received at the Control Unit until the connections are restored.

2-11. Capacitance Proximity Alarm Check

a. Connect an ohmmeter (X100 scale) between terminals 1 and 2 of TB1. Ohmmeter should indicate less than

2,000 ohms (no alarm). If ohmmeter reading is not correct, remove and replace circuit card.

NOTE

Ohmmeter may show initially a high resistance (alarm) due to

the technician (operator) having been in proximity to sensitive

components while connecting the ohmmeter. If so, move away

from the protected enclosure; low resistance (less than 2, 000

ohms) should be indicated after approximately five seconds.

b. Approach one of the items of protected equipment, and test for acceptable sensitivity. Ohmmeter should

indicate greater than 100K ohms (alarm). If ohmmeter reading is not correct, remove and replace circuit card.

c. Have the person step away from the protected equipment. After approximately five seconds, ohmmeter should

indicate less than 2,000 ohms (cessation of alarm). If ohmmeter reading is not correct, remove and replace circuit card.

d. Repeat steps b. and c. for each of the other items of protected equipment. If ohmmeter reading is not correct,

remove and replace circuit card.

2-12. Tamper Alarm Check

a. Connect an ohmmeter between terminals 5 and 6 of TB1. Ohmmeter should indicate greater than 100K ohms

(alarm). If ohmmeter reading is not correct, remove and replace circuit card.

b. Place the plunger of the tamper switch in the maintenance position (fully out). Ohmmeter should indicate less

than 2, 000 ohms (cessation of alarm). If ohmmeter reading is not correct, remove and replace circuit card.

2-13. Short Detection

Connect a jumper wire to terminal 2 of TB2. Touch the other end of the jumper wire to terminal 1 of TB2. Ohmmeter

should indicate greater than 100K ohms (alarm). If ohmmeter reading is not correct, remove and replace circuit card.

Remove the jumper wire from terminal 1 of TB2. Ohmmeter should return to less than 200 ohms (cessation of alarm).

2-14. Open Circuit Detection

Disconnect the outer conductor of the sensor cable from terminal 2 of TB2. Ohmmeter should indicate greater than 100K

ohm (alarm} If ohmmeter reading is not correct, remove and replace circuit card. Momentarily touch the outer conductor

of the sensor cable to terminal 2 of TB2. Ohmmeter should indicate less than 2,000 ohms (cessation of alarm} If

ohmmeter reading is not correct, remove and replace circuit card.

2-15. Button Up

After completing the operational check, restore the alarm wire connections to terminals 1, 2, 5, and 6 of TB1 and the

sensor cable connection to terminal 2 of TB2. Close and latch the CPS enclosure and notify the central Control Unit

operator that the CPS is operational.

2-16. Failure Checks

If any portion of the operational check fails, recheck the installation using the instructions in Section II of this chapter as a

guide. Especially check the soundness of the connections of the sensor cable to the equipment, the installation of the

470K ohm cable terminating resistor, the insulation of the outer cable braid, and the insulation of the equipment from

ground. If it is determined that the installation is correct, refer to Chapter 7 for corrective maintenance.

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