KEB COMBIVERT F5-A, Applications Manual, Page: 435 / 552

Special functions
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.15 - 3
7
7.15 Special functions
The following section should facilitate the adjustment and programming of special functions.
7.15.1 DC-braking
The DC braking is available:
- in software type F5-A (standard software), for v/f characteristic control of asynchronous motors (control
type F5-M and cS.00/ control mode < 4)
- in software type F5-H in speed-controlled operation of asynchronous motors without encoder feedback
(cS.01/ actual value source = "2: calculated actual value") and
- at v/f characteristic control (cS.00/ control mode < 4)
During the DC-braking the motor is not decelerated over the ramp. The braking is done with a DC voltage and
a DC current, respectively, that is applied to the motor winding.
After activation of the DC braking, the modulation is switched off and the base-block time (base-block time,
duration dependent on the power circuit) waited for until the DC value is applied to the motor.
With Pn.28 it is adjusted whereby the DC brake is triggered. According to the adjusted mode, the speed when
the DC brake triggers can be preset with Pn.32.
Pn.30 „DC braking time“ determines the braking time (0..100,00 s).
Pn
.29 is bit-coded and defines the inputs which trigger DC braking.