This section explains the sequence of operation for the spray booth’s fan and motor control system. It outlines the startup and shutdown process, motor starter operation, overload protection, and fault reset procedures. It also describes optional field-connected features, including door and light interlocks, compressed air solenoid operation, and safety functions designed to protect equipment and ensure reliable system performance.
RTT Finishing Solutions 2975 Discovery Blvd. Rockwall,Texas 75032 CONTROLS MANUAL
Motor Starter
Table of Contents
Operation
Page 03
Typical operation of the motor starter
Sequence of Operation
Page 03
In depth explanation of how the motor starter works
Schematic
Page 04
Generic electrical schematic of most common starter
Troubleshooting
Page 05
Solutions to common issues
Preventative Maintenance
Page 06
PM Schedule
Parts List
Page 06
List of recommended spare parts
Operation
Ensure proper power is connected to the motor starter from the building breaker panel. Turn the black toggle switch to the on position to start the fan. To shut the fan down, turn the black toggle switch to the off position. If the motor starter detects a fault, it will automatically shut the fan motor off. Press the blue R button to reset the motor starter. If the fault continues, see the troubleshooting section of this manual.
Sequence of Operation
Operator turns fan toggle switch to on position
Power energizes the coil of MR1 contactor
MR1 contactor pulls in and sends power out to fan motor
Thermal overload mounted at the bottom of MR1 contactor monitors current flowing to motor. If current flowing to motor exceeds overload setting, power is de-energized to motor to prevent motor damage.
Optional Features (when field connected)
MR1 contactor pulls in and sends 120vac power through door limit switches, and light limit switches to compressed air solenoid.
Compressed air solenoid energizes allowing compressed air to feed to the spray equipment. In the event of a system fault, the compressed air solenoid will de-energize which will stop the spraying operation.
Generic Schematic
Troubleshooting
Symptom
Possible Solution
Fan Motor Does Not Start
Confirm proper incoming voltage on top of MR1 contactor between terminals L1 and L2 With fan switch turned on, confirm proper voltage on bottom of thermal overload terminals T1 and T2 With fan switch turned on, confirm proper voltage on bottom of thermal overload terminals T1 and T2 With fan switch turned on, confirm proper voltage on contactor coil between terminals A1 and A2 Motor is wired incorrectly. Motor can be wired for use on various voltages. Use schematic on name plate of motor to properly connect motor to voltage being applied. Motor is overloaded. Use amp meter to determine if motor is pulling too many amps based on motor name plate. Remove belts from motor and attempt to run with no belts. Thermal overload is adjusted incorrectly. Determine the FLA (full load amps) of the motor by checking the motor name plate (ensure the voltage being applied to the motor is known). Adjust the thermal overload to match the motor nameplate. Motor is overloaded. Use an amp meter to determine how many amps the motor is pulling then compare that number to the thermal overload and motor name plate. Incorrect voltage applied between terminal A1 and A2 on contactor coil. Use a volt meter to confirm the voltage on those terminals matches what is printed on the coil.
Fan Motor Starts But Makes Humming Noise
Fan Motor Runs For A Few Moments Then Turns Off.
Motor Starter Makes Buzzing Noise When Turned On
Preventative Maintenance Schedule
Once Per Month
Check motor amperage with amp meter. Press “test” button on thermal overload to ensure it will turn off the motor in the event of a fault.
Once Per Year Disconnect power coming into the motor starter. Ensure all wiring connections are tight (over time connections can become loose due to heating/cooling cycles on the wires when a motor is turned on/off) Disconnect power coming into the motor starter. Remove junction box cover from motor and check the wire nut connections to ensure they are tight. Inspect junction box for unusual discoloration which could indicate overheating.
Parts List
Motor Contactor (Varies By Voltage) If coil is 120v: ELE-CT-23-12 If coil is 208/230v:
ELE-CT-23-23 If coil is 480v: ELE-CT-23-48
Normally Open Contact Block ELE-PB-NO
Thermal Overload (Varies By Voltage) 1 Phase: ELE-SOL-1TO5-1P ELE-SOL-3TO16-1P 3 Phase: ELE-SOL-1TO5-3P ELE-SOL-5TO27-3P
Plastic Locking Ring ELE-PBL
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