Central Controllers and Expansion Units Power Supply Units

6ES5 955-3LC42

6ES5 955-3LF42

Output 1

Rated output voltage Vo/pN1

Rated output current Io/pN1

Basic load

5.1V DC $ 1.2% 18 A

0.5A

5.1V DC $ 1.2% 40 A

1.6A (typical)

3.1A (worst case)

Ripple

Spikes

Static voltage tolerances

±at 95% load variation

±at 15% variation of Vi/p

±at temperature variation / 1K

Dynamic voltage tolerances

at load surge 50% to 100% Ii/oN

±overshoot

±settling time

Maximum permitted capacity

v1% of Vo/p1

v4% of Vo/p1

v0.005% of Vo/p1

v0.0005% of Vo/p1

v0.02% of Vo/p1

v3% of Vo/p1

v5 ms

100 mF

v1% of Vo/p1

v4% of Vo/p1

v0.08% of Vo/p1

v0.0005% of Vo/p1

v0.02% of Vo/p1

v3% of Vo/p1

v5 ms

750 mF

Protection and monitoring

Voltage Monitor

Overvoltage shutdown Vo/p1

Undervoltage signal Vo/p1

Current limiting for overload

Test sockets for Io/p1

Signaling section

Green LED: ª5V o.k.º for Vo/p1

Monitors voltage for

<14 V and > 16 V

6V $ 5%

4.75 V + 3%

1.0 to 1.2 Io/pN1

On front plate (3 V ¢ 18 A) linearity range:

0.5 V/2.8 A to 3 V/18 A

Signals for SIMATIC S5,

relays ªFan Warning, Fan Alarm, Warningº 250V/3A

LED lights up if

4.75V < Vo/p1

Monitors voltage for

<14 V and > 16 V

6V $ 5%

4.75 V + 3%

1.0 to 1.2 Io/pN1

On front plate (3 V ¢ 40 A) linearity range:

0.5 V/6.6 A bis 3 V/40 A

Signals for SIMATIC S5,

relays ªFan Warning, Fan Alarm, Warningº 250V/3A

LED lights up if

4.75V < Vo/p1

Output 2

Rated output voltage Vo/pN2

Rated output current Io/pN2

Total current X2 and front terminals

Ripple

Spikes

DC 24 V (+ 25%, -12.5%)

1 A

1 A max.

v1% of Vo/p2

v2% of Vo/p2

DC 24 V (+ 25%, -12.5%)

2.8 A

2.8 A max.

v1% of Vo/p2

v2% of Vo/p2

Protection and monitoring

Current limiting for overload

Green LED ª24V o.k.º for Vo/p2

Maximum permitted capacity

1 to 1.3 Io/pN2

LED lights up if

Vo/p2 > 19.9 V to 21.1 V

0.2 mF

1 to 1.3 Io/pN2

LED lights up if

Vo/p2 > 19.9 V to 21.1 V

0.8 mF

4-52

System Manual

C79000-G8576-C199-06

Page 118
Image 118
Siemens S5-135U/155U appendix 6ES5 955-3LC42 6ES5 955-3LF42 Output, Protection and monitoring