Power Management
Function description74
Version: 1.5
16.4 DC link charging and monitoring
The new state machines for “Umain” and “DC link charging” ensure high availability and at the same time
improved protection of the servo drive.
Basis is the fast measurement of the mains (X01) and DC link voltage.
All servo drives in a common DC link group must have a firmware version ≥ v2.10.
The charging of the DC link is faster and the axis is thus ready for operation sooner.
The voltage tolerance of the mains voltage for error messages has become larger:
• By default the overvoltage limit is 120% of the mains voltage
• and the undervoltage limit 70% of the mains voltage.
If larger values are desired, they can be entered with P-0-0202 (overvoltage, values > 20%) and P-0-0203
(undervoltage, values > 30%).
The warnings for mains overvoltage or undervoltage are always triggered at the limits defined by P-0-0202
(overvoltage) and P-0-0203 (undervoltage).
This means in the case of P-0-0202 >20% and voltage values > rated voltage (P-0-0201) + P-0-0202 [in %]
that the error is triggered simultaneously with the warning.
In the case of undervoltage, error and warning are triggered simultaneously if P-0-0203 > 30% and the
present voltage is < P-0-0201 – P-0-0203 [in %].
Mains interruptions do not cause an error message as long as the DC link voltage approximately
corresponds to the last measured mains voltage. In the case of low energy requirement of the axes it is quite
possible to bridge mains interruptions lasting up to one second.
The request „Axis to move until no voltage is present“
(P-0-0204 „DisableDcLinkVoltageMonitoring“) results in no error message being generated in relation to the
DC link voltage. At a lower voltage, however, not all speeds can be reached. The application must therefore
monitor the DC link voltage.
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