7
7.3 List of faults and warnings
7-680
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
724 Invalid motor pole pair number
Cause Synchronous motors:
– The pole pair number in P1112 is zero or negative.
– Encoder with CD track (P1027.6 = 0): The pole pair number in P1112
is greater than 6.
– Encoder without CD track or with Hall sensors (P1027.6 = 1):
The motor pole pair number is dependent on the encoder pulse
number (max. 4096 for P1005 >= 32768).
Induction motors:
– An invalid pole pair number was determined from P1134 and P1400.
Motor with resolver:
– The maximum motor pole pair number for the modules
6SN1118–*NK01–0AA0 or 6SN1118–*NJ01–0AA0 is 64, otherwise 4 or 6.
Remedy Synchronous motors:
– Check P1112, P1027 and P1014.
Induction motors:
– Determine and correctly enter rated speed and/or rated frequency.
Acknowledgement POWER ON
Stop response STOP II (SRM, SLM) STOP I (ARM)
725 Invalid encoder pulse number
Cause The encoder pulse number of the motor measuring system (P1005) is
set to zero.
Remedy Harmonize the encoder pulse number of the motor measuring system
in P1005 to the encoder used. The indirect motor measuring system
must always be configured for synchronous and induction motors (ex-
ception: Induction motor operation).
Standard setting: 2 048 increments/revolution
Acknowledgement POWER ON
Stop response STOP II (SRM, SLM) STOP I (ARM)
726 Invalid voltage constant
Cause The voltage constant of the motor in P1114 is set to zero.
Remedy Determine the voltage constant of the motor used, and enter in P1114.
The voltage constant is measured as induced voltage (EMF) under no-
load conditions at n = 1 000 RPM as RMS valued at the motor termi-
nals (phase to phase).
Third-party motor:
The voltage constant should be determined from a motor data sheet.
Siemens motor:
The voltage constant is determined from the motor code (P1102).
Acknowledgement POWER ON
Stop response STOP II (SRM, SLM) STOP I (ARM)
7 Fault Handling/Diagnostics
04.05
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