Flowserve NRS 1-50 For TWO Electrodes User Manual download pdf (Page 19)

Commissioning – continued –

Checking switchpoint and function

Start

Activity Indication Function

Apply

mains voltage.

All LEDs are illuminated.

System is being started and tested,

this takes approx. 10 sec.

Output contacts are open.

Signal outputs 1 and 2 are closed.

All LEDs are illuminated for

more than 10 sec.

System malfunction. Possible causes:

Faulty power supply, level switch defective.

Raise water in boiler until the

switchpoint “low water level (LW)”

is ecxeeded. Level electrode(s)

make(s) contact with the water.

Green LEDs for level

electrode 1 / 2 illuminated.

Output contacts are closed.

Signal outputs 1 and 2 open.

Checking switchpoint and function

Lower water level until it is below

the switchpoint “low water level

(LW)”. Level electrode(s) is/are

exposed.

Red LEDs

for level electrode 1 / 2 are

ﬂashing.

De-energizing delay is running.

Signal outputs 1 and 2 are closed

instantaneously.

Red LEDs

for level electrode 1 / 2

illuminated.

Delay time has elapsed,

output contacts open.

Signal outputs 1 and 2 are closed.

Possible installation faults

Status and indication Fault Remedy

Sightglass indicates level

below switchtpoint “low water

(LW)”, red LEDs for level

electrodes 1/2 not illuminated.

Safety circuit closed.

Electrode rod(s) is/are too long.

Cut electrode rod(s) to the length dictated by the

switchpoint LW.

If installed inside the boiler: Up-

per vent hole in protection tube

does not exist or is obstructed.

Check installation of level electrode. Make sure

that the level in the protection tube corresponds

to the actual water level.

Water level sufﬁcient. Red

LEDs for level electrodes 1 / 2

illuminated! Safety circuit open.

Electrode rod(s) is/are too short.

Replace electrode rod(s) and cut new rods to

the length dictated by the switchpoint LW.

The earth connection to the

vessel is interrupted.

Clean seating surfaces and screw in level

electrode with metallic joint ring. Do not insulate

the electrode with hemp or PTFE tape!

Electrical conductivity of the

boiler water too low.

Set response sensitivity of the level switch to

0.5 μS/cm.

Upper vent hole ﬂooded.

Check installation of level electrode. Make sure

that the level in the protection tube corresponds

to the actual water level.

LED alarm 2 /

operating mode

Level electrode1

Test & diagnosis

button

LED alarm 1 /

operating mode

Level electrode 2

Test & diagnosis

button

Diagnosis LED

Fig. 14

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 27 28

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Flowserve NRS 1-50 For TWO Electrodes User Manual Page 19

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