Remote Keyboard Up To 200 Metres; Remote Keyboard From 200 Metres Up To 500 Metres; Remote Keyboard For More Than One Unit - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
20.10.3

Remote keyboard up to 200 metres

To connect a remote keyboard two "T" shunt boards must be used, one near the controller and one near the remote keyboard.
In case of a remote keyboard monitoring a single unit for a distance of less than 200 metres, the correct configuration is as follows.
Unit
20.10.4

Remote keyboard from 200 metres up to 500 metres

If the remote keyboard must be installed over 200m away from the local network (LAN), a power unit must be installed near the remote keyboard.
The remote keyboard cannot be installed more than 500 m away.
The only difference between this and a remote keyboard up to 200 metres is that the power unit must be to terminals 1 and 2 of the T shunt (the one near the remote
keyboard). In this case a 3-wire cable connecting the two T-shunts is sufficient.
If just one chiller is connected, the connection diagram is:
Unit
20.10.5

Remote keyboard for more than one unit

To connect more than one chiller to the same remote keyboard, connect the two boards together by jumpering connectors J11.
A configuration similar to the two shown above should only be used on the first board in the network (the one nearest the remote keyboard).
Technical manual
6x1 mm 2
shielded and
twisted
Figure 20-11: Electric diagram for connecting a remote keyboard at a distance of up to 200 m
3x1 mm
2
shielded
and twisted
Figure 20-12: Electric diagram for connecting a remote keyboard at a distance between 200 m and 500 m
Unit 1
Unit X
Last unit
Figure 20-13: Basic scheme to connect a remote keyboard to more units
or
3x1 mm
2
The highlighted part must be included for distances
between 200 and 500m
3x1 cable on connector J11
to other units
122
TRANSLATION OF THE ORIGINAL INSTRUCTIONS