SECTION 9
9-22
01/01/2014
VOLTAGE ON TERMINAL #49. IF VOLTAGE IS NOT PRESENT
THE UNLOAD SWITCH (SW5) IS DEFECTIVE, REPLACE. IF
VOLTAGE IS PRESENT, THE GRAIN UNLOADING LIGHT
(DS19) IS DEFECTIVE, REPLACE.
B1. IF AUXILIARY UNLOAD STARTER (S8) DOES NOT PULL IN
AND VOLTAGE IS PRESENT AT LOAD SIDE OF COIL, THE
HOLDING COIL IS DEFECTIVE, REPLACE.
B2. IF AUXILIARY UNLOAD STARTER (S8) DOES PULL IN,
CHECK LOAD SIDE OF INTERLOCK (SW20) ON AUXILIARY
UNLOAD STARTER (S8) FOR PRESENCE OF VOLTAGE (120
VOLTS). IF VOLTAGE IS PRESENT AT LOAD SIDE OF
INTERLOCK (SW20), CHECK OPPOSITE SIDE OF INTERLOCK
(SW20). IF NO VOLTAGE IS PRESENT, THE INTERLOCK
(SW20) IS DEFECTIVE, REPLACE.
B3. IF UNLOAD AUGER STARTER (S7) DOES NOT PULL IN AND
VOLTAGE IS PRESENT AT LOAD SIDE OF COIL, THE
HOLDING COIL IS DEFECTIVE, REPLACE.
C1.
OVERLOADS ON UNLOAD AUGER AND/OR AUXILIARY UNLOAD
STARTER(S) (S7, S8) MAY HAVE TRIPPED FROM A MOTOR
DRAWING HIGH AMPERAGE. DETERMINE WHICH ONE IS OPEN.
RESET DEFECTIVE OVERLOAD. IT WILL BE NECESSARY TO
DETERMINE IF A SHORT CIRCUIT OR EXCESSIVE OVERLOAD
CONDITION EXISTS IN THIS ISOLATED SYSTEM AND WHAT
CORRECTIVE STEPS NEED TO BE TAKEN TO RESOLVE THIS
CONDITION. OTHER POSSIBLE CAUSES COULD BE (1) BAD
MOTOR, REPLACE. (2) JAMMED UNLOAD SYSTEM, CORRECT.
(3) LOOSE WIRING CONNECTIONS ON TERMINALS, TIGHTEN.
(4) DEFECTIVE OVERLOAD, REPLACE.
C2.
CHECK FOR OVERFLOW CONDITION, CORRECT.
7A.
SEQUENCE:
METERING SELECTOR SWITCH (SW6) TO "MAN",
ENERGIZING METERING SYSTEM CIRCUIT.
ACTION:
METERING SELECTOR SWITCH (SW6) TO "MAN" POSITION, STARTS
METERING ROLLS AND DISCHARGES AT VARIABLE RATE CONTROLLED
BY SETTING OF MANUAL METERING CONTROL (RV1).
NOTE:
UNLOAD AUGER AND AUXILIARY UNLOAD SYSTEM MUST BE
"ON" BEFORE METERING SYSTEM IS ENERGIZED.
SYMPTOMS: A. METERING ROLLS DO NOT START.
B.
DRYER SHUTS DOWN IMMEDIATELY OR DURING UNLOADING
OPERATION.
C. RATE OF DISCHARGE CANNOT BE CONTROLLED.
POSSIBLE
CAUSE: A1. DEFECTIVE UNLOAD STARTER INTERLOCK (SW21).
A2. DEFECTIVE FUSE(S) – DC MOTOR DRIVE (SCR1).
A3. DEFECTIVE METERING ROLL SELECTOR SWITCH (SW6).
A4. DEFECTIVE DC MOTOR DRIVE (SCR1).
Содержание DPX12T
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