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11  Fault diagnosis and troubleshooting

11.1 General fault diagnosis and troubleshooting

Fault

Cause

Remedy

Device cannot be 

switched on

No mains voltage 

Device fault

Connect the device to the 

mains.
Send the device to the manu-

facturer for inspection.
Stop using the device!

Charging process 

takes longer than 

usual

Derating active due 

to high ambient 

temperatures or poor 

circulation
Parallel loads

Ensure sufficient circulation 

at the rear of the device, and, 

if necessary, remove any dust 

by vacuuming.
Remove parallel loads

11.2 Fault diagnosis STM 820/860

Fault

Cause

Remedy

LED permanently 

red

No battery connected
Totally discharged 

battery connected 

(voltage <  V)
Battery connected 

with reverse polarity


Connect the battery. 

Disconnect the battery and 

check polarity.

LED slowly flashes 

red

Battery fault
Max. battery capacity 

has been reached

Battery with too high 

or too low a voltage 

is connected
Overvoltage due to 

additional power 

supply/ 

charger


Check the battery.
Set the capacity correctly.
Check the battery. Disconnect 

other loads.
Disconnect the battery. The 

battery charger is not suitable 

for this battery. 

Disconnect the additional  

power supply/charger.

LED quickly 

flashes red

Device fault

Send the device to the manu-

facturer for inspection.
Stop using the device!

11.3 Fault diagnosis STM 821/861

STM 81/861 devices display fault messages in plain text.
During charging, an info screen which displays additional device data (e.g. tem-

peratures) can be opened with the down (more) button.

Fault message

Cause

Remedy

Device fault

Hardware defective

Send the device to the manu-

facturer for inspection.
Stop using the device!

Overvoltage

Wrong battery con-

nected 

Additional power  

supply/charger con-

nected

Disconnect the battery. The 

battery charger is not suitable 

for this battery (battery volt-

age too high).
Disconnect the additional  

power supply/charger.

Battery fault

Maximum capacity 

charged

Correct the battery capacity 

setting.
Check the battery.
Disconnect other loads.

Summary of Contents for Stecamat STM 820

Page 1: ...Installation and operating instructions Stecamat STM 8 0 1 V 4 V 36 V 48 V STM 8 1 1 V 4 V 36 V 48 V STM 860 1 V 4 V 36 V 48 V STM 861 1 V 4 V 36 V 48 V 7 3 977 Z0 09 47 BATTERY CHARGING SYSTEMS EN...

Page 2: ...7 5 2 Menu description 7 6 Mounting 9 6 1 Mounting location requirements 9 6 2 Mounting the STM 860 861 9 6 3 Mounting the STM 820 821 9 7 Operation 10 7 1 STM 820 860 10 7 2 STM 821 861 11 8 Care mai...

Page 3: ...65 24 V 35 A 24 V 35 A 36 V 25 A 36 V 25 A 48 V 18 A 48 V 18 A STM 861 12 V 50 A 12 V 50 A LCD display IP 65 24 V 35 A 24 V 35 A 36 V 25 A 36 V 25 A 48 V 18 A 48 V 18 A 1 About this manual These opera...

Page 4: ...s thawed out Lead acid batteries may only be charged if the acid level complies with the bat tery manufacturer s specifications WARNING Ensure that a professional electrician regularly checks the func...

Page 5: ...If acid splashes into the eyes immediately rinse with plenty of water and seek medical advice Ensure that the battery is in a secure and stable position because if the battery were to tip over or fall...

Page 6: ...ed Send the device to the manufacturer for inspection and do not use it any longer 4 Devices with potentiometer and LED STM 860 4 1 Structure The STM 860 battery chargers comprise the following compon...

Page 7: ...ing In start screen start stop charging process 5 2 2 Adjusting settings Example adjusting the displayed battery capacity Make sure that the parameter Battery capacity is marked with the symbol If nec...

Page 8: ...actor 0 3 C the charging current for a 100 Ah battery is 30 A Temperature compensation If temperature compensation is switched on the end of charge voltage is reduced in high temperatures and increase...

Page 9: ...the mains cables or charging cables 6 2 Mounting the STM 860 861 Attach the mounting plate to the wall with four M5 screws not provided Allow the device to slide down from above onto the hooks which p...

Page 10: ...harged When the LED slowly flashes green the battery is 100 charged Trickle charging is being realised by the device Trickle charging can continue for any length of time STM 820 turn the potentiometer...

Page 11: ...ength of time Stop the charging process with the stop button Disconnect the charging clips from the battery Switch off the device with the mains switch STM 861 only 8 Care maintenance and service The...

Page 12: ...nts 12 V 24 V 36 V 48 V Charging capacity 12 V variant max 600 W 24 V variant max 840 W 36 V variant max 840 W 48 V variant max 840 W Characteristic curves STM 820 860 IU STM 821 861 IU IA constant U...

Page 13: ...variant with factory settings 1 Pre charging with end of charge voltage only with totally discharged batteries 2 Charging with constant charging current charging voltage increases 3 Recharging with e...

Page 14: ...t factor This setting is suitable for back up operation e g to supply power to vehicles in exhibition rooms or for uninterruptible power supplies 10 4 4 On off charging 100 16 V 14 4 V 13 8 V 13 5 V 1...

Page 15: ...w a voltage is connected Overvoltage due to additional power supply charger Check the battery Set the capacity correctly Check the battery Disconnect other loads Disconnect the battery The battery cha...

Page 16: ...ension period in writing by the customer the reduction in value caused by the fault shall be replaced or if this is not sufficient taking the interests of the end customer into consideration the contr...

Page 17: ...e product They will help you with any issues you may have Europe Steca Elektronik GmbH Mammostrasse 1 87700 Memmingen Germany Tel 49 0 8331 8558 0 Fax 49 0 8331 8558 132 Email ladesysteme steca com Ba...

Page 18: ...18 723 976 09 47 EN...

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