Maintenance and service, 3 replacement of mains fuse – KROHNE OPTISONIC 3400 Ex EN User Manual

Page 27

MAINTENANCE AND SERVICE

OPTISONIC 3400

www.krohne.com

10/2013 - 7312472200 - AD EX OPTISONIC 3400 -en- R02

5.3 Replacement of mains fuse

• Pull the display unit of the mounting frame and turn display unit carefully aside.
• Unscrew the two screws size M4 that hold the mounting frame with the electronics unit.
• Carefully pull the mounting frame with electronics unit out of the housing, until the small

printed circuit board with the six soldered coaxial cables can be pulled off of the sensor driver
PC-board. Now carefully remove the unit from the housing, while keeping the small printed
circuit board with coaxial cables down, close to the housing wall.

• The mains fuse is located in a fuse holder at the back-end of the electronics unit on the top

printed circuit board (power supply PCB). The specifications must be as follows:

• Reassemble the unit in reverse order.

WARNING!
Before commencing the work, refer to Before and after opening on page 26

, then continue as

follows:

Fuse type: 5 x 20 mm (H) according to IEC 60127-2/V

Power supply

Electrical data

KROHNE part number

12...24 V DC

250 V / 2 A

5060200000

24 V AC/DC

250 V / 2 A

5060200000

100...230 V AC

250 V / 0,8 A

5080850000

WARNING!
Before reassembling the unit, refer to Before and after opening on page 26

, then: