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Electrical Maintenance (Rev. 04/03)
53
Wire 7EA supplies control voltage from the unit to the cur-
rent relay at terminal 4. When the current relay is energized,
control voltage passes through the contacts to terminal 2
and wire 7EB to energize the motor start relay. The C3
capacitor, which is connected in parallel with the control
coil of the motor start relay, works with the motor start relay
to act as a smoothing device to reduce chatter in the motor
start contactor.
Motor Start Contactor Control Coil Circuit
7EA energizes the motor start contactor through the start
relay when the current in T2-T2A exceeds 27 amps
A branch of wire 7EA also supplies control voltage to one
side of the motor start relay contacts. When the motor start
relay is energized, control voltage passes through the closed
contacts and wire 7EB to energize the motor start contactor.
The contacts in the motor start contactor close when it is
energized through the motor start relay. T3E and T3F are
energized and the start capacitors provide the phase shift
and boost in power necessary to start the motor under a
load.
Summary of Contents for KD-II SR
Page 4: ......
Page 8: ......
Page 13: ...Safety Precautions Rev 04 03 v AEA40...
Page 14: ...Safety Precautions Rev 04 03 vi AEA38...
Page 33: ...Unit Description Rev 04 03 19 1 Evaporator 2 Access Door Rear View Curbside KD II SR 1 2 AEA38...
Page 37: ...Unit Description Rev 04 03 23 Power Receptacle Box KD II SR 50 AEA42...
Page 58: ...Remote Control Panel Features Rev 04 03 44...
Page 112: ...Refrigeration Maintenance Rev 04 03 98...
Page 120: ...106...
Page 146: ...132...
Page 156: ...142...
Page 162: ...148...
Page 170: ...156...
Page 172: ...158...
Page 173: ...159 KD II 30 Schematic Diagram Page 1 of 2...
Page 174: ...160 KD II 30 Schematic Diagram Page 2 of 2...
Page 175: ...161 KD II 30 Wiring Diagram Page 1 of 2...
Page 176: ...162 KD II 30 Wiring Diagram Page 2 of 2...
Page 177: ...163 KD II 50 Schematic Diagram Page 1 of 2...
Page 178: ...164 KD II 50 Schematic Diagram Page 2 of 2...
Page 179: ...165 KD II 50 Wiring Diagram Page 1 of 2...
Page 180: ...166 KD II 50 Wiring Diagram Page 2 of 2...
Page 181: ...167 KD II 50 SR 230 1 60 Wiring Diagram Page 1 of 2...
Page 182: ...168 KD II 50 SR 230 1 60 Wiring Diagram Page 2 of 2...