Siemens Sinumerik 840C Diagnostics Manual page 221

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07/97
300767 Natural frequency greater than Shannon frequency
Scan
Cyclic after control power up
Effect
With MSD:
S
Pulse reset, motor coasts down
S
SIMODRIVE_READY and DRIVE_READY are reset.
S
Reset error
With FDD:
S
Controllers disabled, motor braked
S
SIMODRIVE_READY and DRIVE_READY are reset.
S
Reset error
Response via MD 1613.0 can be configured as from drive SW 2.
Explanation
The natural frequency of a speed setpoint filter is greater than the Shannon sampling frequency from the sampling
theorem.
Remedy
The natural frequency of a speed setpoint filter must be lower than the reciprocal value of two speed controller
pulserates.
Speed setpoint filter 1:
MD 15200.01MD 1514 < 1 / (2MD 100131.25 microsec)
Speed setpoint filter 2:
MD 15210.01MD 1517 < 1 / (2MD 100131.25 microsec)
Note
Alarm in SW 5 and higher
300768 Counter bandwidth greater than double blocking frequency
Scan
Cyclic after control power up
Effect
With MSD:
S
Pulse reset, motor coasts down
S
SIMODRIVE_READY and DRIVE_READY are reset.
S
Reset error
With FDD:
S
Controllers disabled, motor braked
S
SIMODRIVE_READY and DRIVE_READY are reset.
S
Reset error
Response via MD 1613.0 can be configured as from drive SW 2.
Explanation
The counter bandwidth of a current or speed setpoint filter is greater than twice the blocking frequency.
This error message is generated for the general band blocking only if:
Speed setpoint filter 1:
MD 1516 > 0.0 or
MD 1520 100.0
Speed setpoint filter 2:
MD 1519 > 0.0 or
MD 1521 100.0
Current setpoint filter 1:
MD 1212 > 0.0
Current setpoint filter 2:
MD 1215 > 0.0
Current setpoint filter 3:
MD 1218 > 0.0
Current setpoint filter 4:
MD 1221 > 0.0
Remedy
The counter bandwidth must be smaller than double the blocking frequency.
Current setpoint filter 1:
MD 1212 x 2MD 1210
Current setpoint filter 2:
MD 1215 x 2MD 1213
Current setpoint filter 3:
MD 1218 x 2MD 1216
Current setpoint filter 4:
MD 1221 x 2MD 1219
Speed setpoint filter 1:
MD 1516 x 2MD 1514
Speed setpoint filter 2:
MD 1519 x 2MD 1517
Note
Alarm in SW 5 and higher
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SINUMERIK 840C / SIMODRIVE 611–D (DA)
1 Alarms
1.5.1 Alarm description
Reset key
Reset key
1–213