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Appendix
A.1 Description of terms
No-load current I
μ
This is the current (effective phase current) that is required for operating the motor under no-
load conditions at the rated speed without load torque. The no-load current defines the
motor magnetization in the base speed range (low speed at the start of field weakening).
Maximum speed n
max
This is the speed determined by mechanical factors. The maximum speed n
exceeded.
NOTICE
Motor damage when the maximum speed is exceeded
The maximum speed n
rating plate. The motor can be damaged if you operate it at inadmissible speeds.
• Make sure that the maximum permissible speed is not exceeded. Realize this by using a
Maximum torque M
This is the torque that is briefly available for dynamic operations, for example, during
accelerating.
Maximum current I
max
This is the current (effective phase value) that is produced at the rated speed and maximum
torque.
S1 duty (continuous operation)
This is the operation with a constant load, the duration of which is sufficient for the motor to
go into a thermally steady state.
S6 duty (intermittent operation)
This is the operation that comprises a sequence of identical duty cycles; each of these duty
cycles comprises a time period with a constant motor load and a no-load time period. Unless
otherwise specified, the constant-load time period refers to a duty cycle of 10 minutes.
Example:
S6-25% =
124
is the highest permissible operating speed and is stamped on the
max
suitable control system or by activating the speed monitoring function in the drive.
max
2.5 minutes of load operation, 7.5 minutes of no-load operation
max
Equipment Manual, 09/2021, A5E51077676A-AA
must not be
1PH1 main motors
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