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5 fault/error messages via leds – Siemens Simatic S7-400 User Manual

Page 93

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Power Supply Modules

3-13

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

3.5

Fault/Error Messages via LEDs

Introduction

The power supply modules of the S7-400 indicate module faults and backup
battery faults via LEDs on the front plate.

Overview of the Fault/Error Messages

Table 3-7

Error messages of the power supply modules

Type of Fault/Error

LEDs

Module fault

INTF

5 VDC

24 VDC

Backup battery fault

Power supplies with 1 backup battery:

BAF

BATTF

Power supplies with 2 backup batteries:

BAF

BATT1F
BATT2F

INTF, 5 VDC, 24 VDC

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 3-8

INTF, DC5V, DC24V LEDs

LED

INTF DC5V DC24V

Cause of Fault

Remedy

D

D

D

Standby switch in position

Set standby switch to the

I

position

Line voltage missing

Check line voltage

Internal fault, power supply module
defective

Replace power supply module

Cutoff after overvoltage on 5 V or illegal
external supply

Disconnect from mains and reconnect
after approximately 1 minute; if
necessary, remove external supply

Power supply module operated in
wrong slot

Install the power supply module in the
correct slot (slot 1)

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 the supply is external; if not,
replace power supply module

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