Siemens Sinumerik 840C Diagnostics Manual page 224

1 Alarms
1.5.1 Alarm description
300778 Illegal converter frequency rotor position identification
Scan
Power–up and cyclic
Effect
FDD only:
– Controllers are disabled, motor brakes
– SIMODRIVE_READY and DRIVE_READY are canceled.
Explanation
When selecting the rotor position identification (MD 1018), only converter frequencies (MD 1100) of 4 kHz or 8 kHz
are permissible.
Remedy
Change converter frequency or deselect rotor position identification.
Note
Applies as from SW 6
Motor moment of inertia x 0
300779
Scan
Power–up and cyclic
Effect
for MSD:
– Pulse suppression, motor coasts down
– SIMODRIVE_READY and DRIVE_READY are canceled
for FDD:
– Controllers are disabled, motor brakes
– SIMODRIVE_READY and DRIVE_READY are canceled.
Explanation
Motor moment of inertia MD 1117 has a value that is smaller or equal to zero.
Remedy
Enter a correct value in machine data MD 1117 "Motor moment of inertia".
Note
Applies as from SW 6
300780 IO motor > I-rated motor
Scan
Power–up and cyclic
Effect
MSD only:
– Pulse suppression, motor coasts down
– SIMODRIVE_READY and DRIVE_READY are canceled.
Explanation
The no–load current of the motor (MD 1136) is greater than the rated current (MD 1103) of the motor.
Remedy
– Change motor data
– Save Boot drive
– Power up again
Note
Applies as from SW 6
300781 IO motor > I-rated power section
Scan
Power–up and cyclic
Effect
MSD only:
– Pulse suppression, motor coasts down
– SIMODRIVE_READY and DRIVE_READY are canceled.
Explanation
Because of its no–load current (MD 1136), the motor connected is too large for the power section used (continu-
ous current MD 1108).
Remedy
Replace power section or motor
Note
Applies as from SW 6
Reactance x 0
300782
Scan
Power–up and cyclic
Effect
FDD only:
– Controllers are disabled, motor brakes
– SIMODRIVE_READY and DRIVE_READY are canceled.
Response configurable via MD 1613.0 as from drive SW 4.
Explanation
The stator reactance MD 1139 or rotor reactance MD 1140 or main field reactance MD 1141 is smaller than or
equal to zero.
Remedy
Correct error when entering MD 1139, MD 1140 or MD 1141.
Note
Applies as from SW 6
1–216
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SINUMERIK 840C / SIMODRIVE 611–D (DA)
04/96
07/97
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