SECTION 9
9-3
01/01/2014
1B. SEQUENCE:
MAIN CIRCUIT BREAKER "ON" *(380V,480V,575V-3P SYSTEMS)*
ACTION:
MAIN POWER LIGHT "ON", APPLIES POWER TO HIGH VOLTAGE
CIRCUITS, STEP DOWN TRANSFORMER (XMFR5) AND 120V CONTROL
CIRCUIT BREAKER (CB1).
SYMPTOMS:
A.
NO MAIN POWER LIGHT (DS1).
B. CONTROL CIRCUIT BREAKER (CB1) HAS TRIPPED.
POSSIBLE
CAUSES:
A1. DEFECTIVE MAIN POWER LIGHT (DS1).
A2. DEFECTIVE CONTROL CIRCUIT BREAKER (CB1).
A3. DEFECTIVE FUSE IN MAIN PANEL DISCONNECT.
A4. DEFECTIVE FUSES F1 AND/OR F2.
A5.
DEFECTIVE TRANSFORMER (XMFR5).
B1. SHORT CIRCUIT.
B2. OVERLOAD CONDITION.
B3. DEFECTIVE CIRCUIT BREAKER (CB1).
CORRECTIVE
ACTION:
A1.
CHECK TERMINAL #25 FOR 120 VOLTS. IF POWER IS
PRESENT THE MAIN POWER LIGHT (DS1) IS DEFECTIVE,
REPLACE.
A2. CHECK CONTROL CIRCUIT BREAKER (CB1), IF DEFECTIVE,
REPLACE.
A3.
CHECK ACROSS L1 & L3 ON THE MAIN POWER DISTRIBUTION
BLOCK. IF LINE VOLTAGE IS NOT PRESENT, CHECK MAIN
PANEL DISCONNECT FOR POWER. IF FUSES ARE DEFECTIVE,
REPLACE.
A4.
CHECK TO SEE IF VOLTAGE IS PRESENT ON L1-POS AND
L2-NEU (120 VOLTS) ON THE 120 VOLT PANEL POWER
DISTRIBUTION BLOCK (TB2). IF POWER IS NOT PRESENT,
CHECK FUSE F1 AND F2. IF DEFECTIVE, REPLACE.
A5.
IF FUSE F1 AND F2 ARE OKAY AND NO VOLTAGE IS
PRESENT ON L1-POS AND L2-NEU (120 VOLTS) ON THE 120
VOLT PANEL POWER DISTRIBUTION BLOCK (TB2) THE STEP
DOWN TRANSFORMER (XMFR 5) IS DEFECTIVE, REPLACE.
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.
2. SEQUENCE:
POWER SWITCH (SW1) TO "ON", ENERGIZING SAFETY CIRCUIT.
ACTION:
SAFETY CIRCUIT PROVEN LIGHT "ON" (DS11), ALL SAFETY
CIRCUIT MONITOR LIGHTS "ON" (DS2 – DS8), APPLIES POWER TO
ENTIRE 120 VOLT CIRCUIT AND ENERGIZES POWER RELAY (K8).
Содержание DPX12T
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