Constant Torque Motor • Agenda • What is torque • General Motor Characteristics • Motor connections • PSC versus Constant Torque Blower curves • Troubleshooting
What is Torque r F
What is Torque Rotational Force r Blower Wheel F Motor
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 50-60 Hz Min 47Hz Max 126 Hz RPM 1050 Control Input 24vac/dc Min 12vac/dc Max33vac/dc
Constant Torque Motor Hi-Voltage Connections L = Line, G = Ground, N = Neutral 3/16” x 0.020 QC’s Same nomenclature for 115V and 230V(just treat neutral as L2) Blank slot for keying/future use. Note: These motors are NOT dual voltage.
Constant Torque Motor Low-Voltage Connections 24vac Common Std. 1/4” x 0.036 QC’s 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 24 Tap 1 2 3 4 5 50% 60% 70% 80% 90% Value 24 vac is applied to the Tap in order to tell the motor what torque to produce.
Constant Torque Motor “Constant-Torque” Motor Torque PSC 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 • 1st 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 ?