Siemens SIMATIC S5-115F - Page 235

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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RESET
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5V DC
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5.2V DC
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24V DC
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INT DC
POWER
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L+
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M
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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
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PE
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RESET
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5 V
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5,2 V
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24 V
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EXT. BATT
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24 V
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Signals
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INT. DC POWER
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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