Instruction manual

i .LON 100 e3 Hardware Guide 15
Figure 1.7
i .LON Relay Output Connectors
Pulse Meter Inputs
The i .LON 100 server includes two impulse meter inputs. These pulse meter
inputs are in compliance with the DIN 43 864 impulse standard (open terminal
voltage <12VDC, maximum current ≤27mA). The supervision of the inputs is
under software control of the
i .LON 100 server and its applications.
The meter input connections are implemented on screw terminals 9 through 12.
Meter 2 is connected to terminals 9-10, and Meter 1 is connected to terminals 11-
12. The impulse meter inputs are polarity sensitive, and the (+) and (-)
connections for Meter 1 and Meter 2 are noted adjacent to the terminals.
Reversing the polarity of the meter inputs will cause improper operation of the
measurement circuits and must be avoided.
A pulse meter registers a pulse when the circuit between its positive and
negative connections is closed (i.e. the Voltage is 0) for 30ms or longer. The
circuit must be open for a minimum of 30ms between pulses.
Figure 1.8 shows the pulse meter screw terminals (circled in red).