Magnetic Contactor
A noisy contactor (hum or chatter) is generally due to
enough dust or dirt on the armature pole faces or
around the armature core that the magnet coil cannot
pull the armature into a completely sealed position.
This can usually be corrected by blowing or wiping the
pole faces clean.
Disconnect the
electrical power to the machine and
follow lockout / tagout procedures.
Inspect the contactor as follows:
1.
Remove two screws and the contactor cover.
2.
Look at the electrical contacts for damage (pits
and / or burns).
3.
If damage is found, replace contactor.
Certain procedures in this section
require electrical test or measurements while power is
applied to the machine. Exercise extreme caution at
all times. If test points are not easily accessible,
disconnect power and follow lockout / tagout
procedures, attach test equipment and reapply power
to the test.
Heating Element
1.
Measure the voltage at the heating element
terminals and verify it against the data plate
voltage.
A.
If voltage is correct then proceed to Step 2.
B.
If voltage is not correct, check the following:
•
Fuses or breaker blown.
•
Power to contactor coils.
•
Contactors not pulling in (mechanical
linkage damaged).
2.
Check current draw (amps) through the heating
element lead wires. See Table 10.
A.
If current draw is correct then heating
element is ok.
B.
If current draw is not correct then proceed to
Step 3.
3.
Disconnect the heating element lead wires.
4.
Use a VOM to check the element resistance.
•
If resistance readings are not correct,
replace the heating element.
VOLTAGE
TOTAL KW
NUMBER OF
ELEMENTS
KW PER
ELEMENT
AMPS PER LINE
RESISTANCE
PER ELEMENT
1 PH 3 PH
(OHMS)
1PH
3 PH
208
18
2
9
87
50
14.42
240
18
2
9
75
44
19.20
480
18
2
9
NA
22
76.80
*220 / 380
240 / 415
18
2
9
NA
25
19.20
208
24
4
6
116
68
21.63
240
24
4
6
100
58
28.80
480
24
4
6
NA
29
115.20
*220 / 380
240 / 415
24
4
6
NA
57.8
28.80
208
24
2
12
116
68
10.82
240
24
2
12
110
58
14.40
480
24
2
12
NA
29
57.60
*220 / 380
240 / 415
24
2
12
NA
34
14.40
VSX BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES
Page 25 of 82
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