AL S
08.95
AL S/2-15
Siemens AG 1997 All Rights reserved 6SN1197–0AA20
SIMODRIVE 611 (PJ)
Average secondary voltage 29 V AC
RMS
K1
F
M
C1
R1
S1
Supply
~
V
C1 – Capacitor F – MCB
K1 – Contactor contact M – Single–phase transformer
S1 – Holding brake V – Rectifier
R1 – Varistor (e.g. Q69–X3022 Siemens type 30 V)
Fig. 2-9 Recommended external power supply circuit for the holding brake
Technical data for the holding brakes are provided in the appropriate motor
chapters.
!
Important
The brake connecting cable is included in the power cable. The insulation be-
tween the power– and brake connection is designed for the basis insulation
(230 V).
To protect the internal logic voltage (PELV)
1)
basic insulation must also be pro-
vided between the coil and contact of relay K1.
The PELV power supply may not be used for the holding brake (refer to the
recommended circuit).
Note
You must always ensure that there is a minimum 24 V –10% available at the
connector on the motor side, in order to guarantee that the brake opens cor-
rectly.
The voltage drop across the power cable brake conductors must be taken into
account. The voltage drop for copper cables can be approximated as follows:
dU=0.042*(l/q)*I
Brake
l =cable length in m
q =brake conductor cross–section in mm
2
I
Brake
=brake DC current in A
dU =voltage drop along the brake cable in V
Example: 1FK6101 with brake EBD 3.8B I
Brake
=0.9A, l=50m, q=1mm
2
dU=0.042*50/1*0.9=1.89
i.e.thevoltageonthesupplysidemustbeaminimumof 24V*0.9+1.89V=23.5 V.
1) Safety extra–low voltage
J
General information on AC servomotors
2.2 Mounted/inte
rated components
10.96
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