Appendix
A.1 Description of terms
1PH7 induction motors (Machine tools)
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
237
S1 duty (continuous operation)
Operation with a constant load, the duration of which is sufficient that the motor goes into a
thermal steady-state condition.
S6 duty (intermittent operation)
S6 duty is operation which comprises a sequence of identical duty cycles; each of these duty
cycles comprises a time with constant motor load and a no-load time. Unless otherwise
specified, the load period refers to a duty cycle of 10 min.
S6-40 % = 4 min load operation, 6 min no-load operation
S6-60 % = 6 min load operation, 4 min no-load operation
Speed for field weakening with constant power n
2
Maximum achievable speed at rated power corresponding to the specified operating mode
(duty type) according to IEC 60034-1.
Thermal time constant T
th
The thermal time constant defines the temperature rise of the motor winding when the motor
load is suddenly increased (step increase) up to the permissible S1 torque. The motor has
reached 63% of its S1 final temperature after T
th
.
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