Mech Brake Ctrl - ABB ACS850 Firmware Manual

No. Name/Value
40.04 Voltage reserve
-4 ... 50%
40.06 Force open loop
False
True
40.07 IR-compensation
0.00 ... 50.00%
42

42 Mech brake ctrl

42.01 Brake ctrl
No
With ack
Description
Defines the minimum allowed voltage reserve. When the
voltage reserve has decreased to the set value, the drive
enters the field weakening area.
If the intermediate circuit DC voltage U
voltage reserve is 5%, the RMS value of the maximum output
voltage in steady-state operation is
0.95 × 550 V / sqrt(2) = 369 V
The dynamic performance of the motor control in the field
weakening area can be improved by increasing the voltage
reserve value, but the drive enters the field weakening area
earlier.
Voltage reserve.
Defines the speed/position information used by the motor
model.
Motor model uses the speed feedback selected by parameter
19.02 Speed fb sel.
Motor model uses the internal speed estimate (even when
parameter 19.02 Speed fb sel
speed).
Defines the relative output voltage boost at zero speed (IR
compensation). The function is useful in applications with a
high break-away torque where direct torque control (DTC
mode) cannot be applied.
U /U
N
(%)
Relative output voltage. IR
compensation set to 15%.
100%
15%
Field weakening point
See also section IR compensation for a scalar controlled
drive on page 44.
Voltage boost at zero speed in percent of nominal motor
voltage.
Mechanical brake control configuration. See also section
Mechanical brake control
Activates the brake control function with or without
supervision.
Note: This parameter cannot be changed while the drive is
running.
Brake control disabled.
Brake control enabled with supervision (supervision is
activated by parameter 42.02 Brake
= 550 V and the
dc
is set to Enc1 speed
Relative output voltage. No
IR compensation.
on page 35.
acknowl).
Parameters 169
FbEq
1 = 1%
0
1
/ Enc2
f (Hz)
100 = 1%
0
1