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PowerFlex 7000
Performance
(Torque Capabilities)
Glossary of Terms
Breakaway Torque:
Accelerating Torque:
Steady State Torque:
Torque Limit:
7000 "A" Frame
The PowerFlex 7000 drives have been tested on a dynamometer to
verify performance under locked rotor, accelerating, and low speed-
high torque conditions. Table B-4 below shows the PowerFlex 7000
drive torque capabilities as a percent of motor rated torque, independent
of the drive's momentary overload conditions.
Table B-4 – PowerFlex 7000 Drive Torque Capabilities
Parameter
Breakaway Torque
Accelerating Torque
Steady State Torque
Maximum Torque Limit
** Drive will require over sizing to achieve greater than 100% continuous torque.
Torque required to start a machine from standstill.
Torque required to accelerate a load to a given speed, in a certain
period of time. The following formula may be used to calculate the
average torque to accelerate a known inertia (WK
T = ( WK
2
× change in RPM) / 308t
T
where,
= acceleration torque in (lb-ft).
WK
must accelerate, including motor, gear box, and load.
t
= time (seconds) to accelerate total system load.
Continuous operating torque required to control the load, without
instability.
An electronic method of limiting the maximum torque available from
the motor.
The software in a drive typically sets the torque limit to 150% of motor
rated torque.
Catalog Number Explanation – Drive Selection
7000 Torque Capability
Without Tachometer
(% of Motor Rated Torque)
90%
90% ( 0-8 Hertz )
125% ( 9-75 Hertz )
125% ( 9-75 Hertz ) **
150%
2
= total system inertia (lb-ft
B-5
7000 Torque Capability
With Tachometer
(% of Motor Rated Torque)
150%
140% ( 0-8 Hertz )
140% ( 9-75 Hertz )
100% ( 1-2 Hertz )
140% ( 3-60 Hertz ) **
150%
2
):
2
) that the motor
7000A-UM151E-EN-P - October 2018
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