Figure FO-17. Clarifier Control Fault Isolation Flow Chart

TM 11-5865-215-13

WITH OSCILLOSCOPE

REPLACE

CHECK FOR PULSE

CCA Al

ACTIVITY ATA3-105

CHANNEL A

1. CONNECT CHANNEL D OF OSCILLOSCOPE TO A3-106

(0671). THIS NEGATIVE GATE ESTABLISHES THE TEST

INTERVAL WITHIN WHICH ALL DATA IS MEASURED

(REFER TO FIGURE A). ADJUST OSCILLOSCOPE SWEEP

SO THAT THE GATE FILLS THE WIDTH OF THE TRACE.

INTERNALLY SYNC THE OSCILLOSCOPE TO THE

NEGATIVE EDGE OF THIS GATE.

(1623)

2. CONNECT OSCILLOSCOPE CHANNEL B TO

CHANNEL B

AND CHANNEL C TO A3-1OO (1622).

3. ROTATE CLARIFIER CONTROL FULL CW. OBSERVE BOTH

CHANNELS C AND B OF THE OSCILLOSCOPE ARE HIGH

V).

(APPROX

ROTATE THE CLARIFIER CONTROL CW WHILE

1. WITH A VOLTMETER CHECK A3-68

CHANNEL C

OBSERVING CHANNELS C AND B:

AND A3

(-).

a. CHANNEL C SHOULD SHOW 32 HIGH-TO-LOW

2. WHEN THE CLARIFIER CONTROL IS

TRANSITIONS.

FULL CCW THE VOLTMETER SHOULD

b. CHANNEL B SHOULD SHOW 16 HIGH-TO-LOW

THIS VOLTAGE DECREASES

READ

TRANSITIONS.

TO OV AS THE CONTROL IS ROTATED

TO THE FULL CW POSITION.

5. WHEN THE CLARIFIER CONTROL IS FULLY CW BOTH

INTERVAL

CHANNELS C AND B SHOULD BE LOW.

FIGURE A

REMOVE AND

REPLACE CCAS

CHANGE THE CHANNEL D PROBE TO

(0670).

Al AND A5

7. CONNECT THE CHANNEL A PROBE TO A3-101 (1621).

8. ROTATE THE CLARIFIER CONTROL FULL CCW. OBSERVE CHANNELS A, B, AND C ARE HIGH.

ROTATE THE CLARIFIER CONTROL

OBSERVE THE OSCILLOSCOPE:

4 HIGH-TO-LOW TRANSITIONS

a. CHANNEL A SHOULD

b. CHANNEL B SHOULD SHOW 1 HIGH-TO-LOW TRANSITION

TRANSITIONS

c. CHANNEL C SHOULD SHOW 2 HIGH -TO-

10. WHEN THE CLARIFIER CONTROL IS FULL CW CHANNELS A, B, AND C SHOULD BE LOW.

REPLACE

11. CHANGE THE CHANNEL C PROBE TO A3-102

REPLACE

CLARIFIER

12. ROTATE THE CLARIFIER CONTROL FULL CCW, OBSERVING CHANNEL C GOES HIGH.

CCA A3

CONTROL

OBSERVING CHANNEL C CHANGES HIGH-TO-LOW 8 TIMES.

13. ROTATE THE CLARIFIER CONTROL

CHANNEL C SHOULD BE LOW.

14. WHEN THE CLARIFIER CONTROL IS FULL

EL3RJ062

Figure

Clarifier Control

Fault Isolation Flow Chart