RI-R38 instruction manual IM810-U v0.3 pag. 3 / 4
LEGEND
Auxiliary power supply
Terminals 1-3
The auxiliary power supply could be the same of the network to control.
Insulation control
Terminals 5-11
The two terminals must be connected between the line under control and the earth of measure reference.
The terminal 5 must be connected to the neutral conductor of the single-phase or the three-phase line of the line to
control. If the three-phase network is at three wires, the terminal must be connected to a phase.
The maximum voltage required between these terminals is 440V and for this reason it’s possible to put the
insulation controller on single-phase line or on three-phase line with 3 wires without neutral up to 440V and with 4
wires with neutral up to 760V.
Relay output connections
Terminals 7-8-9
To remote signalling by relays with changeover contact max 5A 250V on resistive load.
Automatic or remote RESET connection
terminal 12
Connecting the terminal 12 to the 11 (ground) it’s possible to have a manual RESET functioning (using the push-
button on the frontal of the instrument). Without the connection on the terminal 12 the instrument will function with
automatic RESET when the low insulation stops.
It’s possible to connect an external N.C. contact push-button between the monitoring device and the ground.
FUNCTIONALITY
In normal condition, with insulation value higher than the set threshold, the instrument has the green LED on.
Pressing the TEST button the TRIP LED of alarm signalling and the output relay will be activated.
Depending of the connection the RESET will be automatic when the TEST button is reIeased or using a remote
button or manual using the RESET button on the front panel.
If there is a low insulation on the line (resistance value under the set threshold) will be activated the TRIP signalling
and the output relay. When the insulation on the line will come back higher than the set threshold, the trip signalling
will disappear.
