Connections And Settings - Crowcon IRmax Installations-, Bedienungs- Und Wartungsanleitung

2. Installation 2. Installation

2.6 Connections and settings

All connections described are with reference to the terminal block mounted within IRmax
connector main body. The terminals on the IRmax connector PCB are marked '+', 'sig'
and '0 V'. Correct polarity should be observed when connecting the IRmax to control
equipment.
IRmax is factory set as a 'current sink' device unless otherwise specified when ordering. To
reset to 'current source', remove the back nut and move the two links on the terminal PCB
from the 'sink position to the 'source' position, as shown in Diagram 7.
Note: The external grounding terminal is only to be used where local authorities
permit or require such a connection. Where possible, to limit radio frequency
interference, the auxiliary junction box and cable armour should be grounded at
the control panel (safe area) only to avoid earth loops.
Diagram 7: Sink/source jumper location
The 4-20mA signal can be set to current 'Sink' or 'Source' using the pins and jumper link
shown in Diagram 7. Set to mA 'Sink' by fitting the jumper link to the top and left-hand
pins as shown on the left-hand photograph. Set to mA 'Source' by fitting the jumper link
to the bottom and right-hand pins as shown on the right-hand photograph. IRmax will be
set to current 'Sink' unless specified otherwise when ordering.
LED indication: an LED is fitted to the terminal PCB to indicate the current
operating status. Refer to Section 6 on page 16 for more information.
10 10
Wiring
Number Colour Function
1 Red +V
2 Black 0V
3 Green Signal
IR Display connector
PC communications kit
connector
Status LED
Jumper
settings