Emerson MRLDS Mrlds Setup, Mrlds Wiring, Rmcc Controllers, Mrlds Network Addressing

4.2MRLDS Setup

4.2.1MRLDS Wiring

MODBUS

MRLDS - INSIDE LOWER

PORTION OF BASE	To Gateway
	Board

Figure 3-4- Analog Input Screen Settings Example for E2

3.4.3RMCC Controllers

For RMCC-type controllers, set the Gain parameter to 250 and Offset to -1000.

) )		D
		NG
-	+
(
	(
485	5
		ARHTE ACN 24VAC
	8
	4
S
R
	RS
			14 AWG less
MODBUS			than 6 inches
NETWORK Shield
BELDEN		drain/ground
	8761	wire

A transformer must never be shared between MRLDS and the Gateway board. A separate transformer must be used.

If a transformer is shared between MRLDS units, the “ACN” of each MRLDS must be wired to the same phase of the transformer.

4MRLDS Modbus Version (809-101x)

4.1Network Layout

E2
+
-	I/O Net
	- +
	Gateway
		+	MRLDS
		-
		+	MRLDS
MODBUS		-

+	MRLDS
-
+	MRLDS
-

(Up to 12 MRLDS units on the network per Gateway)

Figure 4-1- Network Layout Example

Figure 4-2- Modbus MRLDS Wiring

4.2.2MRLDS Network Addressing

Modbus network settings are set on jumpers J5, J4, and J3. Refer to Table 4-1(also included on the inside label of the MRLDS) for network addressing with corre- sponding jumper settings.

If more than one MRLDS is on the network, each unit must have a unique address and be numbered according to the inside label (Table 4-1) specifications.

J6 J1

J6 J5 J4 J3 J2 J1

term	network	refrigerant
jumper	address	type
	jumpers	jumpers

Figure 4-3- MRLDS Jumpers (Inside Lower Portion of Cover)

Network Layout MRLDS Modbus Version (809-101x) • 5