Siemens SIMODRIVE 611A Installation And Planning Manual page 213

10.96
08.95
Fig. 2-9
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)
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:
l
q
I
Brake
dU
Example: 1FK6101 with brake EBD 3.8B I
dU=0.042*50/1*0.9=1.89
i.e. the voltage on the supply side must be a minimum of 24V*0.9+1.89V=23.5 V.
1) Safety extra–low voltage
Siemens AG 1997 All Rights reserved
SIMODRIVE 611 (PJ)
Supply
C1
~
V
M
C1 – Capacitor
K1 – Contactor contact
S1 – Holding brake
R1 – Varistor (e.g. Q69–X3022 Siemens type 30 V)
Recommended external power supply circuit for the holding brake
dU=0.042*(l/q)*I
=cable length in m
=brake conductor cross–section in mm
=brake DC current in A
=voltage drop along the brake cable in V
6SN1197–0AA20
2.2 Mounted/integrated components
General information on AC servomotors
Average secondary voltage 29 V AC
F
K1
S1
R1
F – MCB
M – Single–phase transformer
V – Rectifier
1)
basic insulation must also be pro-
Brake
2
=0.9A, l=50m, q=1mm
Brake
AL S
RMS
2
AL S/2-15