Function 8: BOOST
TAB1
This parameter defines the amount of boost added at low speed to increase the initial
motor torque. The boost-characteristic is set with the parameter in TAB2, function FFB.
Values are in percent (%) of the line input voltage.
Care must by exercised with this adjustment as too much
boost may cause excessive heating.
Range: 0...40%
Default: 5%
Function 8
+
: Dynamic BOOST
TAB1
This parameter may be programmed to provide additional torque boost during accele-
ration.
Values are in percent (%) of line input voltage.
Range: 0...50%
Default: 0%
Function 8
−
: U/f-ratio reduction during deceleration
TAB1
This parameter defines the motor voltage reduction during deceleration to compensate
the increase of the DC bus voltage in the reverse regenerative mode.
Values are in % of the line input voltage.
Range: 0...20%
Default: 20%
Function 9: Static torque time
TAB1
This parameter defines the holding brake activation time at zero speed. The amount of
DC-Voltage applied to the motor windings is controlled by TAB1, function 8 (BOOST).
To configure the holding brake for continous operation at zero speed, set the
parameter value to its maximum (25sec.) and press both
INC
and
DEC
simultaneously. "oooo" in the display indicates the activated continuous operation
mode.
In this case the holding brake can be deactivated only by deactivating the inverter
(
ENABLE
= OFF, terminal 11).
If the holding brake is used for long time or with high
DC-Voltage, excessive motor heating may result.
Range: 0...25 sec.
Default: 2 sec.
Function U: Frequency threshold FX1
TAB1
This parameter is used to program a frequency threshold FX1. The outputs OC1, OC2
or REL may be programmed to signalize motor speed equal or greather than FX1.
For programming of the outputs see TAB3, functions OC1, OC2 and REL.
Range: 0...Fmax
Default: 50 Hz
8 5%
ATTENTION!
8
+
0%
8
−
20%
9 2.0s
ATTENTION!
U 50.0Hz
BERGES electronic
30 Operating manual ACM D2/S2 09.07.2001
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