ZEN-LOG-MAN-16V03 (0930)
Copyright © 2016 Define Instruments
25
Connection example for 2, 3 & 4 wire mA output transmitters
Power
Supply
2-Wire
Transmitter
3-Wire
Transmitter
4-Wire
Transmitter
+24V Supply
Input
Channel
Input
Channel
Input
Channel
Output −
Output −
B+
B–
B+
B–
B+
B–
Note 1
All analog inputs are isolated to
other channels and all other voltages.
They also have built in over voltage pro-
tection to 24V, protecting the unit if the
24V supply is inadvertently connected to
the unit when configured for mA input.
Note 2
All cables must be screened, with
screen earthed at one end only.
Note 3
Do not run input cables in close
vicinity to noisy power supplies, contac-
tors or motor cables. The best practice is
to run input cables on a separate earthed
cable tray. This will minimise RFI effects,
of which magnitude cannot be easily
predicted.
Fail-Safe Micro Switch
If you are connecting other instruments in a loop
with a Zen mA input, a fail-safe has been added to
prevent the external loop from being interrupted in
the event of a power loss to the Zen.
To activate the fail-safe for an input channel, turn
on the micro switch above the input terminal. You
will need to remove the input connector to see the
switch, and use a small screwdriver to turn it on.
NOTE
The Fail-Safe Micro Switch is only compatible with mA inputs.
For the accurate operation of this instrument, it is critical that the micro switch be
set to the OFF position for all other input types.
Fail-safe Micro Switch
