Sequence Analysis - DeLUX MSF Operation Manual

1A. Sequence: main circuit breaker "ON" *(230V‐1P, 240V‐3P systems) *
Action:
Symptoms:
Possible
Causes:
Corrective
Action:
1B. Sequence: Main circuit breaker "ON" *(380V, 480V, 575V‐3P systems)*
Main power light "ON", applies power to high voltage circuits and
120v control circuit breaker (CB1).
A. No main power light (LT1).
B. Control circuit breaker (CB1) has tripped.
A1. Defective main power light (LT1).
A2. Defective control circuit breaker (CB1).
A3. Defective fuse in main panel disconnect.
A4. Missing 120 volt wire.
B1. Short circuit.
B2. Overload condition has occurred.
B3. Defective control circuit breaker (CB1).
A1. Check terminal #2 for 120 volts. If power is
Present the main power light (LT1) is defective, replace.
A2. Check circuit breaker (CB1) for fault.
A3. Check across L1 & L3 (L2 on 1P) on the main power distribution
block. If 240 volts is not present, check main panel disconnect
for power and if fuses are defective, replace. (Wild Leg is on L2
– 3P only)
A4. If voltage is present across L1 & L3 (L2 on 1P) on the main
power distribution block, check to see if the black wire is
connected from L1 on the main power distribution block to the
positive side on the 120V panel power distribution block (TB2).
Also check to see that the ground lead (green wire) is
connected to chassis ground and the common lead of the
incoming power source is connected to chassis ground.
B1. Repair or replace burned or bare wiring in contact with chassis
or other wiring.
B2. Check current for any overload conditions and
Correct.
B3. Inspect circuit breaker (CB1) for defect. Replace.
SEQUENCE ANALYSIS
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01/01/2016