Table 8-1. Test Procedure-Continued

Step

Test

Procedure

Corrective action

"C to " D approx. 445-455 ohms.

7

"E to " G approx. 30-45 ohms.

8

"F to" G approx.30-45 ohms.

8

"H to " J approx. 30-45 ohms.

8

"K to " J approx. 30-45 ohms.

8

"M to" J approx. 30-45 ohms.

8

Using 100K scale on ohmmeter check pin to Remote Indicator

1

Cabinet should read Infinity.

Install Remote Indicator Cable P2-P5 to P5 at Remote Indicator only.

.

18

Remote indicator warning

lights

1. Connect Jumper from Computer P2-J to Cable pin "J".

2. Connect Jumper from Computer P2-G to Cable pin "K".

8, 5

Observe red light, move P2-G Jumper to Pin " H" and Pin " M"

8, 5

observe, orange & green respectively. Remove both jumpers.

19

Remote indicator

1. Connect Jumper from Computer P2-J to Cable pin "J".

"floats/tires" lights

2.Connect Jumper from Computer P2-G to Cable Pin G. and "E"

8, 5

observe blue lights for "Floats" & "Tires" respectively.

.

20

Angle transducer

Check Angle Transducer

Unlock transducer and position pendulum somewhere in midrange of

its travel. DO NOT hold in this position by using transducer lock, but

tape or (prop with a small wooden block into this position.) Using 100K

scale on ohmmeter check as follows for continuity & leakage:

1. Continuity -Desirable

10

A to B E to R

J to R

N to R

A to C F to R

K to R

P to R

B to C G to R

L to R

M to S

D to R H to R

M to R

T to Case

2. Leakage--Undesirable

11

A to T

F to T

L to T

B to T

G to T

M to T

C to T

H to T

N to T

D to T

J to T

P to T

E to T

K to T

R to T

B to S

Read the following points while swinging the pendulum through 90

10

degrees:

C to S

C to T

S to T

Read from B to S and it should indicate open. Now, lock the

pendulum and it should show a leak or continuity

3. Lack of continuity and any leakage indicates either an open or a

ground in the transducer, and the complete unit should be replaced .

Visual inspection can be made of the assembly, but faults inside of

potentiometer can not be field repaired. The angle transducer is

shown in Figure 8-7.

21

Angle transducer

Resistance Verification

By using a good ohmmeter resistance values of the windings can be

checked as follows:

1. Check resistance between 'A' and 'B'; should be 25K ohms + 5%.

12

2. Check resistance between 'A' and 'C' and move pendulum.

12

Observe a smooth change of resistance from 0 to 25K ohms t 5%

over 90

3 Check resistance between 'B' and 'C' and move pendulum. Observe

12

a smooth change of resistance from 0 to 25K ohms 4 5% over 90 .

4.Check resistance between 'D' and letter indicated and confirm

approximate resistance:-

`D'-' E'

694. ohms +3%

'D'-' F'

1388. ohms+3%

'D'-' G'

2083. ohms +3%

'D'-'H'

2778. ohms +3%

`D'-'J'

4166. ohms +3%

'D'-'K'

5555. ohms +3%

'D'-' L'

8333. ohms +3%

'D'-'M'

12500. ohms +3%

'D'-'N'

15277. ohms +3%

'D'-' P'

18055. ohms +3%

'D'-' R'

22223. ohms +3%

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