KROHNE ALTOFLUX IFM 6080 K EEx EN - Manual (Page 8)

8
7 Service
Important!
Following instructions must be followed when the converter housing has to be opened (e.g. in case
of replacing the power supply fuse or programming of the converter through the internal IMOCOM-
interface).
To open the housing the special wrench supplied with every flowmeter has to be used.
- Make sure there is no explosion hazard
- Gas-free certificate!
- Make sure all connection cables are safely isolated from any supply.
- Allow the prescribed waiting time to elapse before opening of the housing:
20 mins. for temperature class T6
11 mins. for temperature class T5
7.1 Replacement of the power supply fuse
1. Use the special wrench to remove the cover from the electronic compartment
2. Remove screws R and fold the display board aside.
(see corresponding drawing in sect. 8.5 of the standard Installation and operating instructions).
3. Remove the 2-pole connector X1 (field power) and the 3-pole connector for the electrode circuit
mounted on the safety-barrier printed circuit board.
4. Remove the screws Q of the electronic unit and the screw SE of the earthing strip at the
backside of the electronic unit. For the removal of latter screw a screwdriver for recessed head
screws, size no.2 with a blade length of at least 200 mm is needed.
5. Remove carefully the electronic unit.
6. Replace the power supply fuse mounted at the power-supply printed circuit board.
Electrical data of the fuse: 1,25A slow, breaking capacity High, rated voltage 250V.
(T1,25H250V to IEC127-2, Krohne Ident. no. 5.06232).
7. Reassemble in reverse order.
Note!
- The grounding strip of the safety barrier must always be reliable connected to the signal
converter housing via screw SE.
- Screw the cover of the housing firmly in the housing to ensure that it can not be opened by
hand!
- The screw threads and gaskets on the covers of the electronic and connection compartment
must be well greased at all times (acid and resin free grease, e.g. silicone grease).