3
IMPORTANT
: In order to comply with the safety requirements as per IEC 1010-1, a mains
switch must be provided to disconnect the equipment. This switch must be marked as the
disconnecting device for the equipment and be within easy reach of the operator. The equipment
must be installed inside an electrical mounting cabinet to avoid the possibility that the operator
may touch a connection terminal.
2.2 Input connection
The CI-420 is designed to be able to work with two types of inputs.
2.2.1 Pick-up Input
For the input from turbine type flowmeters which use magnetic inductive pick-ups to detect
the movement of the turbine blades, the wiring must be made as following:
CI-420 Terminal N
o
. Pick-up Terminal N
o
.
14 shield 1 shield
15 live 2 live
16 live 3 live
"live" means the two ends of the pick-up coil.
The input cables must not be installed close to mains cables as these can induce
errors due to electrical interferences.
2.2.2 Electrical contact input
For connecting inputs from reed switches etc., as one can find for example in COVOL
flowmeters, the wiring must be made as following:
CI-420 Terminal N
o
. COVOL Terminal N
o
.
14 shield 1 shield
15 no connection
16 live 2 live
