
Power supply modules
3.5 Fault/Error messages via LEDs
S7-400 Automation System Module Data
60 Reference Manual, Edition 09/2009, A5E00850736-06
INTF, 5 VDC, 24 VDC LEDs
The following table shows the faults indicated by the INTF, 5 VDC, and 24 VDC LEDs and
lists how to remedy the faults. The status of the BAF, BATTF, BATT1F, and BATT2F LEDs is
not relevant here.
Table 3- 7 INTF, 5 VDC, 24 VDC LEDs
INTF
LED
LED
DC5V
LED
DC24V
Cause of fault Remedy
Standby switch in position Set standby switch to the |
position
Line voltage missing Check line voltage
Internal fault, power supply module
defective
Replace power supply module
Cutoff after overvoltage on 5 V or
non-permissible external supply
Disconnect from mains and
reconnect after approximately 3
minutes; if necessary, remove
external supply
Power supply module operated in
wrong slot
Install the power supply module
in the correct slot (slot 1)
D D D
Short-circuit or overload on 5 V Switch off the power supply
module, remove the source of the
short-circuit; after
approximately 3 seconds, the
power supply module can be
switched on with the standby
switch or via the power system.*
D H D Overvoltage on 24 V Check if there is an external
supply; if not, replace power
supply module.
H D* D Short-circuit or overload on 5 V
and 24 V and overheating
Check the load on the power
supply module. Remove module
if necessary. Wait 5 minutes
before switching the power
supply module again.
If the standby switch is set to the
position, illegal external supply
on 5 V
Remove all modules; determine
which module is faulty.
H H D
If the standby switch is set to the |
position, short-circuit or overload
on 24 V.
Check the load on the power
supply module. Remove module
if necessary.
Voltage restored after short-circuit or
overload on 5 V if faults occur in
operation
Press FMR button: Flashing
changes to steady light
D B H
Dynamic overload on 5 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 button: Flashing
changes to steady light
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