NORD Drivesystems BU0180 - Manual (Page 120)

SK 180E Manual for frequency inverters
120 Pre-series version BU 0180 GB-0914
Parameter
{Factory setting}
Setting value / Description / Note Device Supervisor
Parameter
set
P536
Current limit
(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.
With the analog input function in P400 = 13/14, this limit value can also be varied and cause an
error message (E12.4).
0.1 ... 2.0 = Multiplier with the inverter nominal current, gives the limit value.
2.1 = OFF means that this limit value is disabled. The FI supplies the maximum possible
current.
P537
Pulse disconnection
(Pulse disconnection)
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 = The function is so to speak switched off and the FI delivers the maximum possible
current. However, at the current limit the pulse switch off can still be active.
NOTE: The value set here can be undershot by a smaller value in P536.
For smaller output frequencies (<4.5Hz) or higher pulse frequencies (>6 kHz or
8 kHz, P504) the pulse switch-off by the power reduction (see Section 8.3) 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.
P539
Check output voltage
(Check output voltage)
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 = Only motor phase, "Only motor phase error": 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 = Only magnetisation, "Only magnetisation monitoring": 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 + Magnet., "Monitoring of motor phases + magnetisation“: as 1 and 2
combined.
NOTE: This function can also be used as an additional protective function for lifting
applications, but is not permissible on its own as protection for persons.