8400 StateLine C | Reference manual
Basic drive functions (MCK)
Holding brake control
378
L
Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
8.4.6
Feedforward control of the motor before release
The motor is precontrolled by selecting the lower speed threshold for applying the brake.
When the upper speed threshold for brake release is reached, the motor is precontrolled for
200 ms with the lower threshold before the brake switches to the release mode.
The direction of the feedforward control depends on two conditions:
1. On the settings selected under
C02582
:
– Bit 2 = Inverted feedforward control
– Bit 3 = direction of the axis
2. On the sign of the setpoint.
Truth table for the direction of the feedforward control
Setpoint
Sense of direction
Feedforward control
Scheme
Direction
Feedforward
control value
Start value
n
≥
0
Vertical/hoist
(
C02582
: Bit 3 = 0)
not inverted
(
C02582
: Bit 2 = 0)
inverted
(
C02582
: Bit 2 = 1)
n < 0
not inverted
(
C02582
: Bit 2 = 0)
inverted
(
C02582
: Bit 2 = 1)
n
≥
0
Horizontal/winding drive
(
C02582
: Bit 3 = 1)
Inversion via bit 2 is not
effective in case of
horizontal sense of
direction
n < 0
0
P
Q
0
P
Q
0
P
Q
0
P
Q
0
Q
0
Q
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