Power supply modules 3
3.5 Fault/Error messages via LEDs
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 error messages of the power supply modules
Table 3- 6 Error messages of the power supply modules
Type of fault/error LED
Module error INTF
5 VDC 24 VDC
Power supplies with 1 backup battery:
BATTF BAF Backup battery fault
Power supplies with 2 backup battery:
BATT1F BAF BATT2F
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Power supply modules
3.5 Fault/Error messages via LEDs
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 Press FMR button: Flashing
D B H
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Power supply modules 3.5 Fault/Error messages via LEDs
INTF
LED LED
DC5V LED
DC24V Cause of fault Remedy
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; H = LED lights up; B = 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 the following power supply modules:
● 6ES7407-0KA01-0AA0, Release 3
● 6ES7407-0KR00-0AA0, Release ≤ 5
● 6ES7407-0KA01-0AA0, Release ≥ 10
● 6ES7405-0DA02-0AA0, 6ES7407-0DA02-0AA0
● 6ES7405-0KA02-0AA0, 6ES7407-0KA02-0AA0
● 6ES7405-0KR02-0AA0, 6ES7407-0KR02-0AA0
● 6ES7405-0RA02-0AA0, 6ES7407-0RA02-0AA0
The same characteristic is displayed by the built-in overtemperature protection is triggered.
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.
The following power supply modules will switch off in the event of a short-circuit or overload after 1 to 3 seconds. The module will try to restart after no more than 3 seconds. If the error has been eliminated by then, the module will start up. This applies to the following modules:
Modules
PS 405 4A (6ES7405-0DA01-0AA0) PS 407 4A (6ES7407-0DA01-0AA0) PS 405 4A (6ES7405-0DA02-0AA0) PS 407 4A (6ES7407-0DA02-0AA0) PS 405 10A (6ES7405-0KA01-0AA0) PS 407 10A (6ES7407-0KA01-0AA0),
release ≥5
PS 405 10A (6ES7405-0KA02-0AA0) PS 407 10A (6ES7407-0KA02-0AA0) PS 405 10A R (6ES7405-0KR00-0AA0) PS 407 10A R (6ES7407-0KR00-0AA0),
release ≥7
PS 405 10A R (6ES7405-0KR02-0AA0) PS 407 10A R (6ES7407-0KR02-0AA0) PS 405 20A (6ES7405-0RA01-0AA0) PS 407 20A (6ES7407-0RA01-0AA0) PS 405 20A (6ES7405-0RA02-0AA0) PS 407 20A (6ES7407-0RA02-0AA0)
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Power supply modules
3.5 Fault/Error messages via LEDs
Overload at 24 V
In the event of overload at 24 V the output current is electronically limited to a value
between 100% and 150% of the rated value. If the voltage then goes below the undervoltage threshold of 19.2 V (-0/+ 5% corresponds to 19.2 V to 20.16 V), the modules respond as follows:
● For the power supply modules, the 24 V voltage is disconnected and reconnected at a repeat rate of approx. 0.5 to 1 seconds until there is an output voltage that exceeds the undervoltage threshold.
● For the power supply modules 6ES7407-0KA01-0AA0, 6ES740x-0KR00-0AA0 and 6ES740x-0KR01-0AA0, the voltage reaches the level determined by the load impedance, the module is in the characteristic operating range.
After the overload has been eliminated, the voltage returns to the nominal range and the green 24 V LED flashes. The CPU sets the EXTF LED (external fault) and saves the fault in the diagnostic buffer. You can trigger other responses, such as CPU STOP or a message to a control room, in OB 81 (power supply error). If OB 81 is not configured, the CPU continues as normal.
Overload at 5 V
In the event of an overload at 5 V, the power supply modules with 10 A or 20 A output current can retain an output current of 16 A or 26 A for 300 ms. The power supply modules with 4 A output current can retain an output current of 6 A for 300 ms. The CPU will then go to DEFECT afterwards. If the 5 VDC LED flashes on the power supply and can be reset with the FMR button, you will be able to perform a restart. The CPU will remain in STOP
afterwards and will then require a memory reset.
BAF, BATTF
The following table applies to power supply modules with one battery if the BATT.INDIC switch is set to the BATT position. It shows the faults indicated and lists how to remedy the faults.
Table 3- 8 BAF, BATTF; BATT.INDIC LEDs on BATT LED BAF LED
BATF Cause of fault Remedy
H H Battery empty or missing.
No external backup voltage available Insert new battery. Press FMR button.
D H Battery is empty or missing.
Battery stored too long.
External backup voltage available.
Insert new battery. Press FMR button.
Depassivate battery (see Installation Manual).
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Power supply modules 3.5 Fault/Error messages via LEDs
BAF, BATT1F, BATT2F
The following table applies to power supply modules with two batteries if the BATT.INDIC switch is set to the 1BATT position. It shows the faults indicated and lists how to remedy the faults.
Nothing is indicated about the condition of any second battery that may be in use.
Table 3- 9 BAF, BATT1F, BATT2F, BATT.INDIC LEDs on 1BATT LED BAF LED
BATT1F LED
BATT2F Cause of fault Remedy
H H D Battery 1 empty or missing
No external backup voltage available.
Insert new battery in
compartment 1. Press FMR button.
Battery 1 empty or missing External backup voltage available.
Insert new battery in
compartment 1. Press FMR button.
D H D
Battery stored too long.
External backup voltage available.
Depassivate battery (see Installation Manual)
H D D Battery 1 OK.
No external backup voltage available (short-circuit)
Fault after plugging in a module:
Plugged-in module defective
Fault after switching on:
Remove all modules and plug in individually
D D D Battery 1 OK.
External backup voltage available.
-
D = LED is dark; H = LED lights up;
BAF, BATT1F, BATT2F
The following table applies to power supply modules with two batteries if the BATT.INDIC switch is set to the 2BATT position. It shows the faults indicated and lists how to remedy the faults.
Table 3- 10 BAF, BATT1F, BATT2F, BATT.INDIC LEDs on 2BATT LED BAF LED
BATT1F LED
BATT2F Cause of fault Remedy
H H H Both batteries are empty or missing.
No external backup voltage available
Insert new batteries in
compartments 1 and 2 Press FMR button.
D H H Both batteries are empty or missing.
External backup voltage available
Insert new batteries in
compartments 1 and 2 Press FMR button.
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Power supply modules
3.5 Fault/Error messages via LEDs
LED BAF LED
BATT1F LED
BATT2F Cause of fault Remedy
H H D Battery 1 empty or missing No external backup voltage available (short-circuit or overload)
Insert new battery in
compartment 1. Press FMR button.
Fault after plugging in a module:
Plugged-in module defective
Fault after switching on:
Remove all modules and plug in individually
Battery 1 empty or missing Insert new batteries in
compartments 1 and 2 Press FMR button.
D H D
Battery has been stored for too long
External backup voltage available
Depassivate battery (see Installation Manual).
H D H Battery 2 empty or missing No external backup voltage available (short-circuit or overload)
Insert new battery in
compartment 2. Press FMR button.
Fault after plugging in a module:
Plugged-in module defective
Fault after switching on:
Remove all modules and plug in individually
Battery 2 empty or missing Insert new batteries in
compartments 1 and 2 Press FMR button.
D D H
Battery has been stored for too long
External backup voltage available
Depassivate battery (see Installation Manual).
H D D Both batteries in order.
No external backup voltage available (short-circuit)
Fault after plugging in a module:
Plugged-in module defective
Fault after switching on:
Remove all modules and plug in individually
D D D Both batteries in order.
External backup voltage available
-
D = LED is dark; H = LED lights up;
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Power supply modules