Efficient Networks S120 manual External armature short-circuit braking

Basic functions

6.8 Armature short-circuit brake, internal voltage protection, DC brake

External armature short-circuit braking

The external armature short-circuit is activated via p1231 = 1 (with contactor feedback signal) or p1231 = 2 (without contactor feedback signal). It is initiated when the pulses are canceled.

This function controls an external contactor via output terminals, which then short-circuits the motor through resistors when the pulses are canceled. Armature short-circuit braking has the advantage with respect to a mechanical brake that at the start of braking (at a high speed), the braking effect is initially high. However, at lower speeds, the braking effect is significantly decreases - this is the reason that we recommend a combination with a mechanical brake.

A prerequisite for the use of the external armature short-circuit is:

●One of the following motor types was parameterized:

–Rotating permanent-magnet synchronous motor (p0300 = 2xx)

–Linear permanent-magnet synchronous motor (p0300 = 4xx)

In case of incorrect parameterization (e.g. induction motor and external armature short-circuit selected), an error 7906 "Armature short-circuit / DC brake parameterization error" is generated.

+:SXOVHHQDEOH

$6&DFW r0046.4

p1230

(0)

3XOVHLQKLELW

(r0046.19 = 1)

r0046.20

'ULYHVWDWXV666>@

1

≥1

p1231 = 1

&RQWDFWRUIHHGEDFN

p1235

r0002 = 19

&RQWDFWRU2Q

r1239.0

&RQWURO8QLW

DI

DO

2000 µs

&RQYHUWHU

+24 V

M 3~

		p1236 = 200 ms					p1231 = 1
	=1		T	0	&		F07905
							&RQWDFWRUIHHGEDFN2SHQPLVVLQJ
							A07904
					&
							&RQWDFWRUIHHGEDFN&ORVHGPLVVLQJ
		p1237 = 200 ms					p1231 = 2
						+:SXOVHHQDEOH
0				T

1

Figure 6-3 External armature short-circuit braking with/without contactor feedback signal

Internal voltage protection (booksize)

The internal voltage protection is activated with p1231 = 3. It is initiated when the pulses are canceled.

The internal voltage protection is used to protect the drive group when the pulses are cancelled. This is realized by short-circuiting a half bridge in the power unit (Motor Module).

192	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4