Emerson Liebert CRV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 C R 0 2 0 R A 1 C 7 S D 1 8 1 1 E L 1 0 P A - Manual (Page 54)

Startup
Liebert ® CRV ™ 46
9.5.2 Set 2T Rack Sensor Identities—DIP Switch settings
1. Confirm the DIP switches are set correctly for 2T sensors numbered 1, 2 and 3.
2. If additional sensors are to be connected to a cooling unit:
a. Apply numbered stickers to the sensor housings, corresponding to sensor chain position.
b. Based on the sensor number, use the included DIP switch tool to set the DIP switches
according to the table above. If you are having difficulty setting switches through the opening
in the housing or if the hole is not present, you may open the case by removing the three
Phillips-head screws. Reassemble housing once complete.
Figure 35 Setting 2T Sensor DIP Switches
Note: Use included DIP switch tool (or similar tool). DO NOT insert any metal object into the sensor
case.
9.5.3 Terminating the Last 2T Sensor on a Network
The last 2T sensor on the network, which can be identified by only having one CAN cable plugged into
it, needs to be “Terminated”. All other 2T sensors on the network need to remain “Un-terminated”.
Sensor #3 is setup as “Terminated” when it leaves the factory. As long as Sensor #3 is the last sensor
on the network, none of the other termination jumpers in the other sensors need to be adjusted.
Note: The sensors do not need to be connected in numerical order.
For example, if five sensors are purchased, they can be connected in the following pattern:
Note: In the above example, if additional sensors are added at a later time to extend the existing
sensor network, Sensor #3 will have to be “Un-terminated”. The additional sensors can then be
connected, and the new last sensor on the network will have to be “Terminated”.
• the last sensor in the new network must be terminated.
To terminate a 2T sensor:
1. Open the sensor’s case by removing the three screws that hold it together.
2. Pull the black jumper off the circuit board from Pins 1 and 2 (see Figure 36).
3. Install the jumper on Pins 2 and 3.
4. Reassemble the sensor housing.
Non-conductive
DIP switch tool
2T sensor housing DIP switch hole
2T sensor housing case opened
CRV Cooling Unit Sensor #5 Sensor #2 Sensor #4 Sensor #1 Terminated
Sensor #3