Power Supply Modules
2-5
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Basic circuit diagram of the PS 305; 2 A
L+2
M2
L+1
M1
24 VDC
I/
U
Figure 2-2 Basic Circuit Diagram of the PS 305 Power Supply Module (2 A)
Line protection
We recommend that you install a miniature circuit-breaker (MCB) (for example
Siemens 5SN1 series) with the following rating to protect the incoming supply
cable of the PS 305 power supply module (2 A):
• Rated current at 110 VDC: 10 A
• Tripping characteristic (type): C.
Reaction to atypical operating conditions
Table 2-1 Reaction of the PS 305 Power Supply Module (2 A) to Atypical Operating
Conditions
If ... ... Then ... 24 VDC
LED
... the output circuit is overloaded:
• I > 3.9 A (dynamic)
• 3 A < I v 3.9 A (static)
Voltage dip, autom. volt. recovery
Voltage drop, shortening of service life
Flashes
... the output is short-circuited Output voltage 0 V; automatic voltage
recovery after short circuit has been
eliminated
Dark
An overvoltage occurs on the primary side Possible destruction -
There is an undervoltage on the primary
side
Automatic disconnection; automatic voltage
recovery
Dark
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