Constant Torque Motor

Agenda – What is torque – General Motor Characteristics – Motor connections – PSC versus Constant Torque Blower curves – Troubleshooting

What is Torque

F r

F r Motor Blower Wheel Rotational Force

Constant Torque Motors General Characteristics – Same power conversions in the module as variable speed. (Creates 3-phase dc from line voltage) – Same efficiency as variable speed. – Permanent magnet rotor same as variable speed

Constant Torque Motors – Control is optimized around providing constant torque Does not have the flexibility of the variable speed. motor. – Motor receives line voltage all the time – just like variable peed – Motor is programmed, similar to variable speed – Soft (controlled) starting – similar to variable speed – Simpler Interface than variable speed

Constant Torque Motors Motor Voltage 115 volts Rated 110v-120v Min 98 volts Max132 volts 230 volts Rated 220v-240v Min 196 volts Max 264 volts Normal Hz Hz Min 47Hz Max 126 Hz RPM 1050 Control Input 24vac/dc Min 12vac/dc Max33vac/dc

Constant Torque Motor

Note: These motors are NOT dual voltage. L = Line, G = Ground, N = Neutral 3/16” x QC’s Same nomenclature for 115V and 230V (just treat neutral as L2) Blank slot for keying/future use. Hi-Voltage Connections

Constant Torque Motor Low-Voltage Connections Std. 1/4” x QC’s 24vac Common 24vac/dc Connections Applying 24vac to a “Tap” tells the motor to produce the torque programmed into that memory location. (See next slide)

Constant Torque Motor Tap13254 Value 50%70%60%80%90% 24 vac is applied to the Tap in order to tell the motor what torque to produce. 24

PSC Motor

CTM Motors

Constant Torque Motor PSC Motor Torque “Constant-Torque” Motor Torque

Constant Torque Motor Troubleshooting – (until further notice) Apply Line Voltages Apply 24vac/dc signal to Tap 1. This tap should always be programmed If it doesn’t start, replace motor module combination Applying 24vac/dc to an un-programmed motor or un-programmed torque tap, motor will not start. (Please return for warranty)

Constant Torque Motor Labels are expected to have the Taps and their percentages listed on the motor Troubleshooting – The Future The supplier of the CTM has requested the motor and module combination returned for warranty the first year. Separate motor/modules will be available – after the first year

Constant Torque Motor Replacement Parts – 1 st Year – Motor + module will be replaced as a unit – Memphis will program the initial replacement motors. (Updated programming boxes are require for field programming.) – In time, programming will be rolled out to the field, as we currently have with the ECM 2.3, and files will be uploaded to the Amstdnet.

Constant Torque Motor More information will be available at the 2006 Technical Conference Question ?