GB
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3. Maintenance and servicing
3.1 Changing the fuse in the relay module/mains unit
Danger!
Live mains connection!
Electric shocks can kill you.
Disconnect the relay module / mains unit by pulling the plug from the power supply before dismantling!
Danger!
Danger of explosion from short circuit!
Combustion hazard. Blast wave: Flying parts can kill you.
Only use the types of fuses listed below. The unit can be damaged and the explosion protection is at
risk if higher fusing ratings are used.
As the blowing of a fuse generally precedes a fault, have the unit checked by an electrical specialist before
changing a fuse.
The units are adequately protected when 5 x 20 mm IEC 127 finewire fuses are used:
RM1 230 V RM1 120 V RM3 NG1 230 V
Power supply SI3: 0.1 A semi 0.1 A semi 0.1 A semi 0.1 A semi
time-lag (mT) time-lag (mT) time-lag (mT) time-lag (mT)
Motor connection SI1: 4 A time-lag (T) 6.3 A time-lag (T) fuse protection –
by mains supply
with max. 16 A
Valve output SI2: 0.5 A semi 0.5 A semi 0.5 A semi –
time-lag (mT) time-lag (mT) time-lag (mT)
1. Pull out the plug of the relay module/mains unit
2. Remove the cap and release the screws
3. Carefully lift the operating unit/protection cap and relay module/mains unit, paying attention to cable length!
4. Release the reed contact plug
5. Check the finewire fuses and replace if necessary
6. Connect the reed contact plug
7. Mount the relay module/mains unit with operating unit/protection cap onto the flow meter
8. Tighten the screws and replace the cap
D. Relay module RM1/RM3 and mains unit NG1
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