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OM-218 Page 22
SECTION 6 − MAINTENANCE & TROUBLESHOOTING
ST-144 567-A
3 Months
Clean
And
Tighten
Weld
Terminals
6 Months
Tape Or
Replace
Cracked
Cables
Replace
Unreadable
Labels
Fan
Motor
Sealed
Bearings
− No Oil
Needed
OR
During Heavy Service,
Clean Monthly
Blow Out
Or
Vacuum
Inside
See
Section
4-6
− −
10
− −
− −
6-1. Routine Maintenance
Y Turn Off polyweld system, and disconnect input power
before inspecting, maintaining, or servicing.
6-2. Overload Protection
A. Overload Supplementary Protector CB1 And Module Supplementary Protectors CB11 Through CB81
ST-144 570-A / Ref. ST-174 143 / Ref. SC-085 382
1 Overload Supplementary
Protecotr CB1
Supplementary protector CB1 pro-
tects the 115 volts ac windings of
control transformer T3 from over-
load. If CB1 opens, the 115 volts ac
duplex receptacle RC2 would not
work. Manually reset CB1.
2 Module Supplementary
Protectors CB11 Through
CB81
The control circuitry in each of the
eight modules is protected from
overload by a supplementary pro-
tector CBX1 (“X” represents the
number of the applicable module,
1−8). If a module supplementary
protector opens, output from the
affected module would drop to mini-
mum and can not be regulated.
Manually reset the affected
protector.
1
115V AC
10A
115V AC
OVERLOAD
BREAKER
CLOSED
OPEN
2
Y Turn Off polyweld system, and dis-
connect input power before inspect-
ing, maintaining, or servicing.