Siemens Simatic S7-400 - Manual (Page 83)

Power Supply Modules
3-3
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Switching the Line Voltage Off/On
The power supply modules have a making-current limiter in accordance with
NAMUR.
Power Supply Module in Invalid Slot
If you insert the power supply module of a rack in an invalid slot, it will not power
up. In this case, proceed as follows to start up the power supply module correctly:
1. Disconnect the power supply module from the mains (not just the standby
switch).
2. Remove the power supply module.
3. Install the power supply module in slot 1.
4. Wait at least 1 minute and then switch the line voltage on again.
!
Caution
Damage can result.
If you insert the power supply module in a slot that is not intended for power
supply modules, the module may be damaged. Slots 1 to 4 are permissible as long
as you start at slot 1 and leave no gaps.
Make sure that power supply modules are only inserted in permissible slots.
Compliance with the NAMUR Recommendation
If you use one of the modules listed below, you can achieve mains buffering in
accordance with the NAMUR recommendation with a central power supply in
accordance with NAMUR or an uninterrupted power supply.
Table 3-1 Compliance with the NAMUR recommendation
Name Order number
Power Supply Module PS 407 4 A 6ES7407-0DA00-0AA0
Power Supply Module PS 407 20 A 6ES7407-0RA00-0AA0
Power Supply Module PS 405 4 A 6ES7405-0DA00-0AA0
Power Supply Module PS 405 10 A 6ES7405-0KA00-0AA0
Power Supply Module PS 405 20 A 6ES7405-0RA00-0AA0