NORD Drivesystems BU0750 - Manual (Page 113)

7.7 Extra functions
BU 0750 GB-3311 Subject to technical amendments 113
Parameter Setting value / Description / Note
Parameter
set
Available with option
P519 Skip frequency range 2 P Always visible
0.0 ... 50.0 Hz
[ 2.0 ] Skip range for the >Skip frequency 2< P518. This frequency value is added and subtracted from the
skip frequency.
Skip frequency range 2: P518 - P519 ... P518 + P519
P520 Flying start P Always visible
0 ... 4
[ 0 ] This function is required to connect the FI to already rotating motors, e.g. in fan drives. Motor
frequencies >100Hz are only picked up in speed controlled mode (Servo mode P300 = ON).
0 = Switched off, no flying start.
1 = Beoth directions, the FI looks for a speed in both directions.
2 = Setpoint value direction, searches only in the direction of the setpoint value which is present.
3 = Both directions, only following mains supply failure and error
4 = In setpoint direction, only following mains supply failure and error
P521 Flying start resolution P Always visible
0.02... 2.50 Hz
[ 0.05 ] The flying start increment size can be adjusted with this parameter. Values that are too large affect
accuracy and causes the FI to cut out with an overcurrent message. If the values are too small, the
search time is greatly extended.
P522 Flying start offset P Always visible
-10.0 ... 10.0 Hz
[ 0.0 ] A frequency value that can be added to the frequency value found, e.g. to remain in the motor range
and so avoid the generator range and therefore the chopper range.
P523 Factory setting Always visible
0 ... 2
[ 0 ] By selecting the appropriate value and confirming it with the ENTER key, the selected parameter
range is entered in the factory setting. Once this setting is made, the parameter value automatically
changes back to 0.
0 = No change: Does not change the parameterisation.
1 = Load factory settings: The complete parameterisation of the FI reverts to the factory setting.
All originally parameterised data are lost.
2 = Factory settings without bus: All parameters of the FI, however not the bus parameters are
reset to the factory setting.
P535 I 2 t motor Always visible
0 ... 1
[ 0 ] The motor temperature is calculated according to the output current, time and the output frequency
(cooling). If the temperature limit value is reached then switch off occurs and error message E002
(motor overheating) is output. Possible positive or negative effects of ambient conditions cannot be
taken into account.
0 = Switched off
1 = Switched on
P536 Current limit Always visible
0.1...2.0 / 2.1
( x nominal current of
FI)
[ 1.5 ]
The inverter output current is limited to the set value. (as before = "Increase delay") If this limit value
is reached, the inverter reduces the actual output frequency.
0.1 - 2.0 =
Multiplier with the inverter nominal current, gives the limit value
2.1 = OFF indicates that this limit value is switched off. This is also the basic setting of this
parameter.
P537 Pulse switch-off Always visible
0 ... 1
[ 1 ] This function prevents immediate switch-off of the inverter in case of a heavy overload (>200%
inverter current). With the current limit switched on, the output current is limited to approximately
150% of the FI nominal current. This limit is implemented by briefly switching off the end stage.
0 = Switched off
1 = Switched on
Note: For devices above 30kW the Pulse switch-off function can not be switched off.