Interroll DP 0080, User Manual

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16 of 40
Version 1.2 (08/2022) en
Translation of original operating instructions
Options and accessories
4.2 Asynchronous Pallet Drive with frequency inverters
4.2.1 Torque dependent on input frequency
Operating frequency [Hz] 5 10 15 20 25 30-50
Available motor torque in % of
rated motor frequency 50 Hz
80 85 90 95 100 100
The torque dependency depicted in the figure above is expressed as P = T x ω . With a reduced operating frequency
of below 20/24 Hz, the motor torque is reduced by changing heat dissipation conditions.
4.2.2 Frequency inverter parameters
Clock frequency:
A high clock frequency leads to a better utilization factor of the motor. Optimum frequencies are 8 or 16 kHz.
Parameters such as smooth running test quality (motor is running smoothly) and noise development are also affected
positively by high frequencies.
Voltage increase:
Interroll motor windings are designed for a rated voltage increase rate of 1 kV/μs. If a frequency inverter generates
a steeper voltage increase, motor chokes must be installed between the frequency inverter and the motor. However,
since all Interroll Pallet Drives run in an oil bath, the risk of overheating or damage to the motor due to high voltage
increase rates is extremely low. Contact your local Interroll dealer about the need for motor chokes.
Voltage:
If a frequency inverter with single-phase supply is installed in the Pallet Drive, the specified motor must be designed for
the frequency inverter output voltage and must be connected accordingly. Single-phase motors cannot be operated
with a frequency inverter.