Siemens SINUMERIK 840D sl Series Diagnostics Manual page 685

08/2005
Cause: The line synchronization is not possible within the monitoring time.
The infeed was re-synchronized to the line supply because it was interrupted due to a line
frequency that was determined to be either too low or too high.
After 20 attempts, synchronization - and therefore also the power-on operation - were
interrupted.
Remedy: - check the parameterized line frequency and if required change (p0211).
- check the fault thresholds (p0284, p0285).
- check the line supply.
- check the line supply quality.
See also: p0211, p0284, p0285
206601 <location>Infeed: Current offset measurement interrupted
Reaction: NONE
Acknowledge: NONE
Cause: Defective current measurement or a DC current is present during the offset measurement.
Alarm value (r2124, decimal):
1: Excessively high phase current has occurred during the current-offset calibration.
2: The measured current - offset is greater than the 3% of the maximum permissible
converter current (e.g. due to a ground fault in the DC link).
Remedy: Re alarm value = 1:
- possible counter-measure if there is no line contactor: Switch-in the line supply for a
sufficiently long time before OFF1 = 1.
Re alarm value = 2:
- defective current measurement or a DC current is present during the offset measurement.
- check the DC link for a ground fault.
206602 <location>Infeed: Current offset measurement not possible
Reaction: NONE
Acknowledge: NONE
Cause: After an OFF1 = 1 no valid current offset measurement was able to be made within the
monitoring time (p3491) before closing the line contactor.
The phase current measurement calibration is interrupted. The current offset is set to 0.
See also: p3491
Remedy: - check the DC link for a ground fault. A ground fault can destroy parts and components!
- Check the monitoring time setting and if required increase (p3491). At least 100 ms are
required for the current calibration (p3491 > 100 ms).
Notice:
If the current measurement is not calibrated, then under certain circumstances, the quality
of the DC link control will be reduced.
See also: p3491
206800 <location>Infeed: Maximum steady-state DC link voltage reached
Reaction: NONE
Acknowledge: NONE
Cause: The DC link voltage setpoint has reached the maximum steady-state voltage
parameterized in p0280.
The DC link voltage is increased by the modulation depth reserve controller for the
following reasons:
- modulation depth reserve is too low (p3480).
- line supply voltage is too high.
- supply voltage (p0210) parameterized to be too low.
- excessively high setpoint for the reactive line current.
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
Overview of Alarms
2-685