
EK280
Application Manual
22
4.4
HF pulse input with automatic conversion
The EK280 can only count pulses from a high frequency pulse generator via an external power supply, and
not battery power. To ensure uninterrupted gas volume measurement, the EK280 can be configured so that it
switches to a low frequency pulse generator in the event of failure of the external power supply.
When the power supply is functioning, volumes and loads (Vb, Vm, Qb, Qm) will be measured with the high
frequency pulse generator (priority input). In the event of failure of the high frequency pulse generator (e.g.,
due to failure of the external power supply), the EK280 automatically continues to measure with the low
frequency transmitted (fail safe input).
4.4.1
Pulse generator connection
Danger!
For EK280 with internal power supply, the mains voltage must be switched off before
opening the housing, ensure it is not turned back on and verify that there is no voltage.
DE1
DE2
+
-
+
-
+
-
Pulse generator
NF
(Reed contact)
Pulse generator
HF
(Namur)
Connect the gas meter's low frequency pulse generator (LF reed contact) to terminal "DE1" of the
EK280.
Connect the gas meter's high frequency pulse generator (HF Namur) to terminal "DE2" of the
EK280. Respect polarity, i.e. connect the impulse generator's "+" to the "DE2 +" terminal and "-" with
"DE2 -".
Release the inputs 1 and 2 (terminal "DE1" and "DE2") calibration seals.
i
Up to software version V2.30 this can be implemented only with inputs 1 and 2 as illustrated
above. Use of other inputs or other variations is possible from software version V2.31.
Содержание EK280
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