4.2.2Monitoringforsingle-phasefailure
P No. Index Name / Setting Unit Function
701 28 VDC_Variance V^2 DCvoltagevariance
737 MON_MNCTL Monitoringcontrolandstatusword
737 0 MON_MNCTL Monitoringcontrolword
737 1 MON_MNSTAT Monitoringstatusword
760 MON_VDC_Guard MonitoringofDClinkvoltage
0 Tfilt_av ms Filtertimeconstantforaverage
1 Tfilt_var ms Filtertimeconstantforvariance
2 Max_var V^2 Maxallowedvariance
3 Max_time s Maxtimewithvariancethresholdexceeded
4 Check_time s Intervaltocheckreturnoffailedphase
Table 4.8: Parameter - Single-phase failure of the device power supply
In the event of a single-phase failure of the device supply, e.g. a burned-out non-
renewable fuse, the DC link voltage is maintained and the device continues to
operate for the time being. However, the input rectifier can be damaged at a high
output power.
The single-phase power failure detection is set with P 737[0] MON_MNCTL - bit 3 =
1.
The quadratic ripple (variance) of the DC link voltage is calculated. If it exceeds the
threshold value P 760[2]-MON_VDC_Guard - MaxVar for the time P 760[3]-MON_
VDC_Guard - Max_time, the monitoring is triggered.
The actual value is shown in P 701[28] - VDC Variance. Measure this value at
maximum output power and proper operation, then use about 5-10 times that as the
monitoring threshold.
The monitoring triggers error 54-1 (Emergency code 6100h). See chapter 11.6 Error
list.
ID No.: 0842.26B.5-01Date: 09.2020
ServoOne- Device Help
31
4 Power stage
If the parameter is P 737[0] MON_MNCTL, bit 4 = 1, the PowerFail state of the
control is initiated. This must therefore be configured. See chapter 4.2.1 Detection of
a voltage failure. In this case, the error reaction should be set to "Ignore".
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