SIEMENS
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Siemens MD 50.8 · 2017
Motor options
Mounted components
Brake
6
■
Function rectifier
The following table provides an overview of brake control with function rectifiers.
Duty cycle, function rectifier
The high-speed rectifier releases the brake with overexcitation
and thus reduces the maximum duty cycle (on-load factor) of the
brake.
Depending on the supply voltage and the switching frequency,
the maximum duty cycle of the brake solenoid can be taken from
the following diagrams and tables.
Fig. 6/37
Duty cycle/switching frequency for the 103 V DC brake solenoid
Function rectifier
High-speed rectifier + disconnection on the DC side using
Technical specifications
Unit
Current sensing
Voltage sensing
Supply voltage
V
AC
± 10 %
220 … 460
220 … 500
Supply frequency
Hz
40 … 60
40 … 60
Max. output current up to an
ambient temperature of +40 °C
1)
A
DC
1.2
1.2
Output voltage
V
DC
0.445 x supply voltage
(0.89 - max. 8 %) x supply voltage
0.445 x supply voltage
(0.89 - max. 8 %) x supply voltage
Permissible continuous current of
the current sensor
A
DC
0.27 … 34
-
Max. switching frequency
2)
rpm
76
2)3)
76
2)3)
Supported motors
Max. motor current 34 A
No restrictions
Supported brakes
L4 … L400
L4 … L400
Suitable for
Braking operation for fast brake release +
application
Braking operation for fast brake release +
application
Inverter operation
Not suitable
Separate power supply required
Line operation
Direct-on-line starting
Direct-on-line Y/
starting
Motor starters
Not suitable
No restrictions
Operation with driving loads and/or
high moment of inertia
No restrictions
Separate power supply required
Suppressor circuit
Spark suppressor
Spark suppressor
Order code
C59
4)
C60
1)
At higher ambient temperatures the output current decreases.
2)
The specified maximum switching frequencies are upper limit values.
They are essentially dependent on the braking power and the permissible
operating energy of the brakes.
3)
The maximum switching frequency is obtained from the overexcitation
times and recovery times as well as switching-off in holding operation.
4)
The function rectifier
C59
is connected to the terminal
board at the factory depending on the selected circuit or voltage.
not permissible with C60
Duty cycle DC [%]
Switching frequency [
s/h
]
240 V AC
230 V AC
220 V AC
210 V AC
200 V AC
190 V AC
Duty cycle/switching frequency for brake solenoid 103 V DC with AC connection to:
= max. 1800
85 W
≥
With
P
G_D087_EN_00118a
2500
2250
2000
1750
1500
1250
1000
750
500
250
0
100
90
80
70
60
50
40
30
20
10
0
Supply voltage
Switching frequency
s/h
-1
Up to brake size L80
V
AC
1
250
500
750
1 000
1 250
1 500
1 750
2 000
2 250
2 500
220 … 240 V AC for separate power supply
220
100
100
91
83
75
67
59
51
43
35
26
230
100
90
82
74
66
58
50
42
34
25
17
240
100
82
74
66
58
50
42
34
25
17
9
© Siemens AG 2017