Sensus FM-1D/K Operating Instructions - page 4
7. Standard mode
Rapid flashing of all status LED’s indicates incoming
pulses.
The permanently illuminated status LED indicates the
measuring units on the display.
The display can switch between:
• Flowrate
indication
At reverse flow direction the display shows “-000” *)
• Counter reading (first 4 digits)
• Counter reading (last 4 digits)
• Pulse value of the pulser input(Sensor)
• Pulse value of the pulse output
•
Current output range
•
Damping
•
Firmware revision (Test)
*) from serial no. 105 000
To protect the FM-1D/K from voltage surges caused by
lightning, installation of an adequate lightning protection
device is recommended.
Depending on the situation on site, we recommend the
8. Lightning protection
Lightning protector 48 VDC/AC
230 VAC
Overvoltage protection
Lightning protector
15 VDC
Water meter e.g. WP-Dynamic
with pulser OD
Frequency converter
FM-1D/K
Lightning protec-
tor
48 VDC/AC
Max.
20km
Error Symptom Cause
Remedy
9. Trouble Shooting
Status lamps
and LED dis-
play not work-
ing
No current out-
put but internal
display indi-
cates flowrate
No power
supply
Error in the
current out-
put circuit
Check current output
using the test mode
Check connected indica-
tor.
Check external totalizer
and its power supply
No pulse output
but the internal
display counts
the volume
Error in the
pulse output
circuit
Check pulse output using
the test mode
Check external totalizer
and its power supply
Check supply voltage
For 230V: Check voltage
selector (Pos. 230 V) and
fuse F 91 (200 mA m)
For 24 V: Check fuse F 92
(200 mA m)
Error Symptom
Cause
Remedy
Trouble Shooting
Flowrate display
“0“ and no
output pulses
but the water
meter is work-
ing and the
pulser is con-
nected.
Error in the
pulse input
circuit.
If status LED’s are flash-
ing acc. to the incoming
pulses:
Check the settings of
FM-1D/K.
If the status LED’s are
not flashing acc. to the
sensor pulses:
Check input. Remove
pulser, shortcircuit the
sensor terminals
(+) and (-) with a wire.
- If status LED’s flash:
Replace pulser.
- If status LED’s don’t
flash: Check fuses F
111 and F 112
(32 mA m).