Lenze 8400 motec - Manual (Page 282)

8 Basic functions
8.2 Holding brake control
282 Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
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8.2.5 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 value before the brake switches to the release mode.
Here, the direction of the feedforward control depends on two conditions:
1. On the settings selected under C02582 :
• Bit 2 = feedforward control inverted
• Bit 3 = direction of the axis
2. On the sign of the setpoint.
Truth table for the direction of the feedforward control
Related topics:
 Functional settings ( 273)
 Switching thresholds ( 274)

Note!
The feedforward control is only executed in mode 12 ("automatically controlled") or
mode 13 ("semi-automatically controlled").
Setpoint 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 with
horizontal direction not
effective
n < 0
0
P
Q
0
P
Q
0
P
Q
0
P
Q
0
Q
0
Q