NORDAC SK 5xxE Manual
108
Subject to technical alterations
BU 0500 GB
Parameter
Set value / Description / Note
Device
Supervisor
Parameter
set
P536 Current
limit
S
0.1 ... 2.0 / 2.1
(x nominal FI
current)
[ 1.5 ]
The inverter output current is limited to the set value. If this limit value is reached, the inverter
reduces the actual output frequency.
Multiplier with the inverter nominal current, gives the limit value
2.1 = OFF, OFF represents the disabling of this limit value.
P537 Pulse
switch-off
S
10 ... 200 % / 201
[ 150 ]
This function prevents rapid shutdown of the FI according to the load. With the pulse switch-off
enabled, the output current is limited to the set value. This limitation is implemented by brief
switching off of individual output stage transistors, the actual output frequency remains
unchanged.
10...200% = Limit value related to the nominal FI current
201 = Function is disabled
NOTE:
The value set here can be undershot by a smaller value in P536.
For smaller output frequencies (<4.5Hz) or higher pulse frequencies (>6kHz or
8kHz, P504) the pulse switch-off by the power reduction (see Section 8.5) can be
undershot.
NOTE:
If the pulse switch-off is disabled (P537=201) and a high pulse frequency is
selected in parameter P504, the FI automatically reduces the pulse frequency
when the power limit is reached. If the load on the FI is again reduced, the pulse
frequency increases to the original value again.
P538
Mains voltage monitoring
S
0 ... 4
[ 3 ]
For safe operation of the inverter the power supply must meet a certain quality. If there is a brief
interruption of a phase or the voltage supply sinks below a particular limit value, the inverter will
output an error.
Under certain operating conditions, it may be necessary to suppress this error message. In this
case, the input monitoring can be adjusted.
0 = Disabled
: No monitoring of the supply voltage.
1 = Only phase errors:
only phase errors
will produce an error message.
2 = Only low voltage
: only low voltage will produce an error message.
3 = Phase error and low voltage
: Phase errors and low voltage generate error messages.
4 = DC supply
: The input voltage is fixed at 480V for the direct supply of direct current.
Phase error and low mains voltage monitoring are deactivated.
NOTE:
Operation with an impermissible mains voltage can destroy the frequency inverter!
P539 Output
monitoring
S P
0 ... 3
[ 0 ]
This protective function monitors the output current at the U-V-W terminals and checks for
plausibility. In cases of error, the error message E016 is output.
0 = Disabled:
Monitoring is not active.
1 = Motor phase error only:
The output current is measured and checked for symmetry. If
an imbalance is present, the FI switches off and outputs the error message E016.
2 = Excitation monitoring only:
At the moment the FI is switched on, the level of the
excitation current (field current) is checked. If insufficient excitation current is present, the
FI switches off with the error message E016. A motor brake is not released in this phase.
3 = Motor phase and excitation monitoring:
as 1 and 2 combined
NOTE:
This function can be used as an additional protective function for lifting applications,
but is not permissible on its own as protection for persons.
