Mains Monitoring - Lenze 4800 Manual

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7.7.5

Mains monitoring

Purpose
The monitoring ensure faultfree mains operation. In the event of mains failures it
is not possible to refer to the actual mains status. Therefore, the controller sets
pulse inhibit and activates the monitoring function priorisized accordingly.
Message
LU1
LU
OUE
LF
OF
Caution!
If one of the mains monitorings is activated, the drive torque can be lost.
Mains synchronisation for DC controllers
In practice, two complete different mains conditions for DC controller operation
must be considered.
1. Powerful interconnected system which is characterised by a low internal
2. Isolated operation, characterised by a small ratio of generator power
Under C237 the synchronisation can be adapted to the existing mains situation.
C237 = 0
In the event of mains failures, the synchronisation procedure sets pulse inhibit itself.
By this, blown fuses can be avoided in the extent possible with physical measures.
Precondition for fault-free operation with this operating mode is that the mains
supply corresponds to the VDE 0160 which contains regulations for DC controller
operation.
Fault Cause
Phase failure Failure of the mains voltage or mains interruption for more than 120 ms
If the mains interruption is shorter than 120 ms (e.g. if the short-circuit power of the
mains is too low for the DC controller), only pulse inhibit will be set.
Mains undervoltage Mains voltage < 340V or < 410V (variant V014)
Mains overvoltage Mains voltage > 460V or > 550V (variant V014)
Mains Mains frequency < 47Hz
underfrequency
Mains Mains frequency > 63Hz
overfrequency
resistance:
The frequency of the mains voltage is more or less constant. The sine
wave is distorted.
Phase failures - static and short-term - are possible.
and DC controller power:
The mains voltage amplitude and frequency fluctuations can be caused
by loads. Under load, the wave considerably differs from the sine wave.
Phase failures - static and short-term - are possible.
The synchronisation is carried out as in the software versions up to
V5.2 (see code C099).
Configuration
48XX/49XXSHB0399
7-105