Connecting The Motor Holding Brake - Siemens SINAMICS G120D Operating Instructions Manual

Operating the motor in a delta connection with 87 Hz characteristic
The motor only goes into field weakening above 87 Hz.
The higher motor power when operated with an 87 Hz characteristic has the following
disadvantages:
• The converter must supply approximately 1.73x current. Select a converter based on its rated
current - and not its rated power.
• The motor temperature increases more significantly than when operated with f ≤ 50 Hz.
• The motor must have windings that are approved for a voltage > rated voltage U
• As the fan impeller rotates faster, the motor has a higher noise level than operation with
f ≤ 50 Hz.
4.2.14

Connecting the motor holding brake

Electric shock from live parts in the motor terminal box
The temperature sensor and motor holding brake connections of the converter are at DC link
negative potential. Touching live parts on the motor cable and in the motor terminal box can
result in death or severe injury.
• Power down the converter and disconnect all power cables from the converter before
• Insulate cables in the motor terminal box that are not used.
NOTICE
Converter damage when earthing the connections for temperature sensor and motor
holding brake
The temperature sensor and motor holding brake connections are at DC link negative potential.
Earthing any connection of the motor cable will damage the converter.
• Insulate cables in the motor terminal box that are not used.
• Do not earth cables that are not used.
Converter with the control units CU240D-2
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH
WARNING
connecting or disconnecting the motor temperature sensor or the motor holding brake.
4.2 Electrical Installation
In a delta connection, the motor is oper‐
ated with a voltage and frequency above
its rated values. As a consequence, the
motor power is increased by a factor
√3 ≈ 1.73.
In the range f = 0 ... 87 Hz, the motor can
output its rated torque M
The maximum voltage U = 400 V is avail‐
able at a frequency of f = √3 × 50 Hz ≈
87 Hz.
Installation
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