Vulcan VGCTS16 User Manual download pdf (Page 15)

ROUND TILTING BRAISING PANS - SERVICE PROCEDURES AND ADJUSTMENTS

e 15 of 24

Potentiometer

Perform the followin

test procedure to verify the

potentiometer is functionin

properly and to confirm

the temperature settin

of the dial. A V-O-M

connected from TC (-) to the wiper (red) on the

potentiometer will read a volta

e that corresponds to

the set point temperature. Ex. If the set point is

300°F the DC volta

e measured at the wiper should

be approximately 1.49 volts.

1. If the thermocouple condition has not

been

verified as described in step 3A above, place a

jumper across TC (-) and TC (+). If the

thermocouple condition has been verified,

proceed to step 2.

NOTE: Remove jumper when test is

completed.

2. Connect the black meter lead of a V-O-M to the

TC (-) on the temperature controller.

3. Connect the red meter lead of a V-O-M to the

red wire (wiper arm) on the potentiometer.

4. Turn the power switch on and set the

temperature dial to 100°F. Increase set point to

200°F, 300°F, 400°F and 450 °F while

monitorin

the volta

e chan

e between dial set

points. Compare the meter readin

s to the

chart below.

TEMPERATURE

SETTING (°F)

APPROXIMATE

DC VOLTAGE

100 0.38

200 0.93

300 1.49

400 2.0

450 2.3

A. If the volta

e measurements a

ree with

those listed in the table and the increase in

volta

e was smooth without drops or

spikes then the potentiometer is

functionin

properly.

B. If the volta

e measurements do not a

ree

with those listed in the table or the

increase in volta

e was not smooth but

with drops or spikes then the

potentiometer is not functionin

properly.

Replace the temperature controller and

potentiometer assembly and check unit for

proper operation.

HEATING ELEMENTS

(ELECTRIC MODEL)

WARNING: THE FOLLOWING STEPS REQUIRE

POWER TO BE APPLIED TO THE UNIT DURING

THE TEST. USE EXTREME CAUTION AT ALL

TIMES.

1. Measure the volta

e at the heatin

element

terminals and verify it a

ainst the data plate

volta

A. If volta

e is incorrect, find the source of

the problem.

2. If volta

e is correct, check current draw (amps)

throu

h the heatin

element lead wires. If

current draw is correct then heatin

element is

ok. See table below for proper values.

A. If current draw is not correct then, replace

heatin

element.

3. Check for proper operation.

VOLTAGE

TOTAL

AMPERAGE

PER LINE

OHMS PER

ELEMENT

1 PH 3 PH

208 7.5 36.1 20.9 17.4

240 7.5 31.3 18.1 23.1

480 7.5 9.0 30.6

NOTE: Values in the table are nominal. Tolerance is

+5/-10 %.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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