Nord Drivesystems SK 300P Series - Page 95

5 Parameter
BU 0800 en-4521 95
P505 Absolute mini. freq. S P
Setting range
0.0 … 10.0 Hz
Factory setting
{ 2 }
Description
“Absolute minimum frequency”. Specifies the frequency value that cannot be
undershot by the FI. If the setpoint becomes smaller than the absolute minimum
frequency, the FI switches off or changes to 0.0 Hz.
At the absolute minimum frequency, braking control P434 and the setpoint delay P107
are executed. If a setting value of “Zero” is selected, the brake relay does not switch
during reversing.
When controlling lift equipment without speed feedback, this value should be set to a
minimum of 2 Hz. With 2 Hz and above, the current control of the FI operates and a
connected motor can supply sufficient torque.
Note
Output frequencies < 4.5 Hz result in current limitation .
P506 Automatic acknowled. S
Setting range
0 … 7
Factory setting
{ 0 }
Description
"Automatic fault acknowledgement" In addition to manual fault acknowledgement,
automatic acknowledgement can also be selected.
Note
Automatic fault acknowledgement is performed three seconds after the error can be
acknowledged.
NOTICE! This parameter must not be set to 6 “Always” if P428 is set to “On”.
Otherwise, after an active fault (e.g. earth fault/short circuit), the device continually
switches on again. This would result in destruction of the device and could possibly
endanger the system.
Setting values
Value Meaning
0 No automatic fault acknowledgement
When using the
control terminals to
control the FI, the
error message is
acknowledged by
removing the
enabling signal.
1
… 5
Number of permissible automatic fault
acknowledgements within one mains-on
cycle. After mains off and switch on again,
the full amount is available again.
6
Always, a fault message will always be
acknowledged automatically if the cause of
the error is no longer present, see note.
7
Quit disable, acknowledgement is only possible using the OK /
ENTER key or by switching off the mains. No acknowledgement is
implemented by removing the enable!
P509 Control word source
Setting range
0 ... 8
Factory setting
{ 8 }
Description
Selection of the interface via which the frequency inverter receives its control word (for
enabling, direction of rotation, etc.).
Note
Note P510!
For parameterisation via the bus: Set P509 and if necessary P899 to the relevant bus
system.
Setting values
Value Meaning
0
Contr.term. or keyb.
Control is via the optional control display (SK TU5-CTR) (if P510 =
0) or via BUS I/O Bits.
1
Contr. terminal only
Control is via the digital inputs or via the BUS I/O Bits.
2 USS / Modbus The control word is expected via the RS 485 interface.
The frequency inverter automatically detects whether this is a USS
protocol or a Modbus protocol.
8
Ethernet
The control word is received via the Ethernet-based interface,
which was selected in P899 (󰋕󰋖󰋗󰋘󰋙󰋚 see BU 0820).