
Installation & Operation Manual
Terminal 07-08 analog output (SETUP 7)
•
An isolated 4…20 mA signal proportional to the flow rate is available for the ER-420-DC and ER-420-AC
•
When the output is disabled, a 3 5mA signal will be generated on these terminals
•
Maximum driving capacity is 1000 Ohm @ 30V DC
Terminal 09-11 flowmeter input
•
Two basic types of flowmeter signals can be connected to the unit: passive or active pulse
•
The screen of the signal wire must be connected to the common ground terminal 9 (unless earthed at the sensor itself)
•
The maximum input frequency is approximately 10 kHz (depending on the type of signal) The input signal type has to be
selected with the correct SETUP-function (see
"Details of Setup Functions" on page 14
Pulse-signal NPN / NPN-LP
The ER-420 is suitable for use with flowmeters which have a NPN output signal For reliable pulse detection, the pulse
amplitude has to go below 1 2V Signal setting NPN-LP employs a low-pass signal noise filter, which limits the maximum input
frequency (see
"Details of Setup Functions" on page 14
)
Page 29
March 2013