4
CONV 4/420/A - CONV 8/420/A
TECSYSTEM S.r.l ®
2) MOUNTING
Mount the meter inside the board fixing it on DIN EN50022 rail by the fixing hook on the
back of the housing.
The meter is designed to be mounted on the same board where NT935 or NT538 monitor-
ing devices are placed.
3) SUPPLY
CONV 4/420/A and CONV 8/420/A modules must be fed with a 24 VAC/DC ±10% voltage.
In case it is fed by a direct current source, it is not necessary to respect any connection
polarity.
4) CONNECTION TO NT935 / NT538 MONITORING DEVICE.
To connect CONV 4/420/A module to NT935 monitoring device or CONV 8/420/A module
to NT538 monitoring device it is necessary to use a 2-wire shielded cable with 0.5mm
2
section.
Serial cable must be placed the farthest possible from power lines and shielding must be
one-sided grounded.
Yellow led RS FAULT is fixed on in case serial communication line should be cut out or
wrongly connected.
Control software has a special algorithm which can distinguish corrupted data from possi-
ble noises.
In case the transmission line should be extremely disturbed, RS FAULT led will blink.
In this case you have to verify the correct terminal board screw tightening as well as the
suitable cable positioning.
