Setting Parameters
01/02 AWB8230-1413GB
148
Motor restart after removal of the FRS signal
Activation of the digital input configured as FRS (free run stop:
coasting) causes the inverter to shut down, leaving the motor to
coast freely. Two options are available to determine the frequency
inverter’s behaviour after deactivation of the FRS input.
Controlling the internal braking transistor (11 and 15 kW
only)
The 11 and 15 kW versions of the DF6 have a built-in braking
transistor, which is controlled with the following parameters.
Relative permissible duty factor of the built-in braking
transistor
Enter the permissible relative duty factor of the DF6’s built-in
braking transistor here. The value entered here is a percentage of
the longest permissible (continuous) total running time of the
braking transistor, which is 100 s.
Using an example of three braking operations within 100 s, the
illustration below shows the effect of the relative duty factor:
The current relative duty factor T in this example is 44 %.
If, for example, you set PNU b090 to 40 %, a fault message is
issued.
If the braking transistor is operated for a longer period than the
value entered here, fault message E06 is issued.
The assigned external Braking resistor must not fall below the
following minimum values:
Connect the external braking resistor to terminals BR and DC+.
The maximum cable length between frequency inverter and
braking resistor must not be greater than five metres.
If you are using an external braking device, enter 0 % under
PNU b090 and remove any external braking resistors at terminals
BR and DC–.
Under PNU b095, specify when the built-in braking transistor is to
operate.
Under PNU b096, set the voltage threshold at which the built-in
braking transistor becomes active.
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
b088
Motor restart
after removal
of the FRS
signal
–
–
00
0 Hz restart after deactivation of the FRS input
00
01
Synchronization of the motor to the current motor speed
after the waiting time entered under PNU b003.
DF6-340-
Assigned rating
at 400 V
Minimum resistance at DF
= 10 %
= 100 %
kW
O
O
11K
11
50
150
15K
15
50
150
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
b090
Relative
permissible duty
factor of the built-in
braking transistor
–
j
0 to 100 %
To deactivate the relative permissible duty factor of the
built-in braking transistor, enter 0 %.
0
b095
Enable built-in
braking transistor
–
j
00
Do not enable braking transistor
00
01
Enable braking transistor in RUN mode
02
Always enable braking transistor
b096
Voltage threshold
of built-in braking
transistor
–
j
660 to 760 V
With PNU b095 = 01 or 02, the built-in braking
transistor is switched in when the internal DC link
voltage reaches this value.
720
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