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Siemens Simatic S7-400 User Manual

Page 94

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Power Supply Modules

3-14

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Table 3-8

INTF, DC5V, DC24V LEDs, continued

LED

INTF

Remedy

Cause of Fault

DC24V

DC5V

H

D*

D

Short circuit or overload on 5 V and
24 V

Check load on the power supply
module.
Possibly remove modules

H

D*

H/D **

Short circuit or overload on 5 V

Check load on the power supply
module. Possibly remove modules

H

H

D

If the standby switch is at the
position, illegal external supply on 5 V

Remove all modules.
Determine which module is faulty

If the standby switch is at the

I

position, short-circuit or overload on
24 V

Check load on the power supply
module.
Possibly remove modules

D

B

H

Voltage restored after short circuit or
overload on 5 V if faults occur in
operation

Press FMR momentary-contact
pushbutton:
Flashing light changes to constant light

Dynamic overload on 5 V

Check load on the power supply
module.
Possibly remove modules

D

H

B

Voltage restored after short-circuit or
overload on 24 V if faults occur in
operation

Press FMR momentary-contact
pushbutton:
Flashing light changes to constant light

Dynamic overload on 24 V

Check load on the power supply
module.
Possibly remove modules

D

B

B

Voltage restored after short circuit or
overload on 5 V and 24 V if faults occur
in operation

Press FMR momentary-contact
pushbutton:
Flashing light changes to constant light

D

B

B

Dynamic overload on 5 V and 24 V

Check load on the power supply
module.
Possibly remove modules

D = LED is dark; L = LED lights up; F = LED flashing;

* If the power supply module does not start up again after a few seconds once the
overload has been removed, remove power to the module for 5 minutes and then
switch it on again. If the module stills does not start up, you must replace it. This
applies to 6ES7407-0KA01-0AA0, release 3 and for 6ES7407-0KR00-0AA0,
release

5.

** Depending on the short-circuit resistance

If either the 5 VDC or 24 VDC LEDs remains dark after switching on, the system
has not powered up.

If either of the 5 VDC or 24 VDC LEDs of the PS 407 10AR remains dark for longer
than 1 or 2 seconds after it is switched on, the power supply module will not start
up.

This manual is related to the following products: