POWER AND TYPE OF DUTYThe stated power ratings of the single-phase a.c. motors type E...S and the three-phase motors type D...S are valid under the following conditions:
- continuous operation S1 according to DIN VDE 0530 Part 1
- rated frequency: 50 Hz
- switching rate: < 20 activations/h; frequent starting within a short time interval (e.g. inching operation, short test cycles) is not admissive
- coolant temperature: < 40°C
- mounting altitude: < 1000 m above sea level
- ambient temperature: between -10°C and +40°C
Progressive power assignment / Power assignment according to DIN
The motors with progressive power assignment have a two-steps higher rated power compared with motors
according to DIN.Types of duty other than continuous operation S1 we specify on inquiry. Concerning vibration
and noise characteristics the motors correspond to the international standards.
The motor windings are designed in isolation class F.
Thermal motor protection
The motors can be protected by a thermal overload protection device (motor protection switch and overcurrent relay, respectively) or by temperature controllers or PTC resistors built into the winding in connection with a release device.
The overload protection device depends on current and will operate especially with locked rotor. The winding protection device depends on temperature and protects the motors from excessive heating of winding, for instance with strongly changing load or switching operation.
Voltage and frequency
The motors can also be operated - without changing the rated power - in mains where the voltage at rated frequency varies from the rated value up to ± 5%. The values of the permissible limiting excess temperature may be exceeded by 10°C according to DIN VDE 0530.
IEC standard voltagesSingle phase motors:
The standard voltage according to DIN IEC 38 is 230 V 50 Hz. All 2-pole and 4-pole motors are suitable for the voltage range 220 to 240 V 50 Hz. The motors can also be operated with a rated frequency of 60 Hz at the same power and a voltage of 230 V, if the working capacitor will be adapted. The motor specification gives the rated current at 230 V.
Three phase motors:
The standard voltage according to DIN IEC 38 is 230 / Y 400 V 50 Hz. All 2-pole and 4-pole motors are suitable for the voltage range 220-240 / Y 380-420 V 50 Hz.
The motors can also be operated with a rated frequency of 60 Hz at the same power and a voltage of 266/ Y 460 V.
The motor specification gives the rated current at Y 400 V.
Other voltages and/or frequencies
Voltages at 50 or 60 Hz not within the stated rated voltage ranges can be ordered.
For all abnormal voltages the tolerance according to DIN VDE 0530 Part 1 applies.
Pole changing motors
Motor specifications can be offered on enquiry.
Operation at converter
Motors suitable for the operation with converters or voltage regulators can be quoted on enquiry. For these motors a reinforced isolation system is used.