Technical Specifications
S5-115F Manual
PS 951 Power Supply Module 24 V DC; 5 V, 7 A
(6ES5 951-7ND41)
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Block diagram
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SIEMENS
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SIMATIC S5
PS
7A/15A
EXT BATT
3.4...9V
BATT LOW
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a a a a a
RESET
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a a a a a
5V DC
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a a a a a a a
5.2V DC
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a a a a a a
a a a a a a
24V DC
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INT DC
POWER
a a a
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a a a
+
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a a a
-
a a a a
a a a a
a a a a
L+
a a a
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a a a
M
a a a a a a a
a a a a a a a
a a a a a a a
24 V DC
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BATT1-BATT2
3.4V/2Ah
Replace by
trained
personnel
only!
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BATT LOW
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Battery
a a a
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PE
4
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RESET
a a a a
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5 V
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5,2 V
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a a a a a
24 V
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EXT. BATT
a a a
a a a
a a a
L
a a a
a a a
a a a
M
a a a a
a a a a
a a a a
5 V
a a a a a
a a a a a
a a a a a
5,2 V
a a a a a
a a a a a
a a a a a
24 V
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Signals
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M
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INT. DC POWER
a a a
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a a a
1
a a
a a
a a
4
a a a
a a a
a a a
2
a a a
a a a
a a a
3
a a
a a
a a
5
a a a
a a a
a a a
6
a a a
a a a
a a a
7
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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1
Chopper controller
4
Control electronics
2
Linear controller
5
Rectifier
3
Linear controller
6
RI filter
7
Monitoring electronics
Technical Specifications
Input voltage L+
- rated value
24 V DC
- permissible range
19.2 to 30 V
Input current at 24 V
- rated value
5.6 A
- inrush current
max.
15×I
N
- I
2
t
4.5 A
2
s
Power consumption
134.4 W
Output voltage
- rated value
5 V
- tolerance
±1.5%
Output current
- rated value without fans
7 A
- rated value with fans
15 A
- permissible range
0.3 to 15 A
Output voltage (programmer/OP)
- rated value
5.2 V
- tolerance
±1.5%
Output current
max. 2.5 A
Backup battery
2 Li batteries,
size AA
(3.6 V/2 x 1.75 Ah)
- Backup time
min.
1 year (at 0.3 mA,
25 °C and
uninterrupted
backup supply)
Mains buffering
(at L+
min
)
min.
20 ms
Output voltage (auxiliary supply)
- rated value
24 V
- tolerance
±5%
Output current
max. 0.35 A
Short-circuit protection
electronic
Fault indicator
no
Fuse (primary circuit)
integral
Class of protection
class 1
Floating
yes
Insulation rating
electrical separation
to VDE 0160
- tested with
2700 V DC
RI specification
A to VDE 0871
Power loss of the
module
typ.
38 W
Weight
approx. 1.7 kg (3.7 lbs.)
8-8
EWA 4NEB 811 6148-02