Siemens SINAMICS PERFECT HARMONY GH180 - Commissioning; 8.1 RCD Compatibility

4.7.5 Open Loop Test Mode (OLTM)
CAUTION
Open loop test mode (OLTM) is used for test purposes during commissioning only.
Do not use this mode to control a motor.
In OLTM the motor current feedback signals are ignored. This control mode is used during drive
setup, when the modulation on the cells is to be veri󹪝ed, or when testing the drive without a
load. It can also be used when the motor is 󹪝rst connected to the drive to make sure that the Hall
e󹪜ect transducers are working correctly and are providing the correct polarity on the feedback
signals. Do not use this mode to adjust scale factors for input and output, voltage and currents.
In this mode, the drive goes through the magnetizing state to the run state without considering
the motor 󹪞ux. Only motor nameplate values and some drive related parameters are required for
this mode. Ensure the following parameter settings are con󹪝gured for this control mode:
• Disable spinning load and fast bypass.
• Increase acceleration and deceleration times in the Speed Ramp Menu.
• Reduce 󹪞ux demand. Flux and voltage instability may occur with an attached motor.
• Uncouple any connected motor from a load. Do not run higher than 20 to 25 %, this allows for
veri󹪝cation of the current feedback polarity.
NXGPro+ Control Description
4.7 Control Modes
NXGPro+ Control Manual
Operating Manual, A5E50491925A 51