GESTRA NRG 211-1, Оригинальная инструкция по установке

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14
Indication, diagnosis and remedy
Malfunctions indicated by level switch NRS 2-4
Display Error Diagnosis and remedy
LED
Power ON
not illuminated. No supply voltage.
Switch on supply voltage. Check all electrical
connections.
LED Level
electrode
defective and
LED High
Level (MAX)
illuminated
The fixing screw of the level electrode has
not been removed.,
Remove the fixing screw.
Level electrode defective
(insulating seal, stuffing box)
Measure the voltage of the NRS 2-4 across C18/A18.
Measure the voltage of the NRG 211-1 across
terminals 2 and 3. If the voltage ≥ 9 V replace level
electrode.
LED Malfunc-
tion in cable
il-
luminated
Connecting cable to level electrode defec-
tive (short circuit, interruption)
Measure the voltage of the NRS 2-4 across C18/A18.
Measure the voltage of the NRG 211-1 across
terminals 2 and 3. If the voltage ≤ 1 V check the
connecting cables and the wiring.
Attention
Before carrying out the fault diagnosis please check:
Supply voltage:
Is the level electrode supplied with the voltage specified on the name plate?
Wiring:
Is the wiring in accordance with the wiring diagram?
Danger
The terminal strip of the level switch is live during operation.
This presents the danger of electric shock!
Always cut off power supply to the equipment before mounting, removing or connecting
the terminal strip and before unplugging the 19" slide-in unit!
Troubleshooting
Check the supply and measuring voltages of the level electrode. You can measure the voltages on the
level electrode or the level switch. Fig. 5
Checking voltage
Voltages Diagnosis
12 V DC Supply voltage
≤ 0 V – 1 V DC Connecting cable to level electrode defective (short circuit, interruption)
= 1 V – 4 V DC Level electrode exposed, fluid temperature ≥ 395 °C
= 4 V – 7 V DC Level electrode submerged, HIGH level
≥ 9 V DC Level electrode defective (insulating seal, stuffing box)