constant torque motor agenda – what is torque – general motor characteristics – motor...
TRANSCRIPT
Constant Torque Motor
Constant Torque Motor
• Agenda–What is torque
–General Motor Characteristics
–Motor connections
–PSC versus Constant Torque Blower curves
–Troubleshooting
What is Torque
What is Torque
F
r
What is Torque
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 MotorsMotor Voltage
115 voltsRated 110v-120vMin 98 voltsMax132 volts
230 voltsRated 220v-240vMin 196 voltsMax 264 volts
Normal Hz 50-60 HzMin 47HzMax 126 Hz
RPM 1050Control Input 24vac/dc
Min 12vac/dcMax33vac/dc
Constant Torque Motor
Constant Torque Motor
Note: These motors are NOT dual voltage.
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.
Hi-Voltage Connections
Constant Torque MotorLow-Voltage Connections
Std. 1/4” x 0.036 QC’s24vac Common
24vac/dc ConnectionsApplying 24vac to a“Tap” tells the motorto produce the torqueprogrammed into thatmemory location.(See next slide)
Constant Torque Motor
Tap 1 32 54
Value 50% 70%60% 80% 90%
24 vac is applied to the Tap in order to tell themotor 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–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 ?