Aerco Modulex E8 Controls Guide Manual de usuario descargar pdf (Pagina 66)

PR1: 11/30/12 Page 66 of 112

GF-115-C

Modulex E8 Controller and BCM

Operations and Maintenance Manual

OMM-0084_0D

AERCO International, Inc.

•

100 Oritani Dr.

•

Blauvelt, NY 10913

•

Ph: 800-526- 0288

In the event that the external control signal from the Master BMS II or ACS, EMS, or BAS is lost,

the BCM will assume control of the Modulex Boilers, if enabled. When this occurs, the BCM will

maintain the boiler at a constant setpoint based on the resistor installed between terminals 6

and 7 of connector Y2 (see Figure 7-5). In addition, the BCM Fault Relay will be activated and

the red Fault LED (DL2) will light.

7.4.2 Physical Modbus RS485 Wiring

Modbus RS485 devices should be wired in a “Daisy-Chain” configuration similar to the example

shown Figure 7-6. DO NOT wire the units in a “Star” configuration where all devices are

connected to a central point (node).

Figure 7-6. Typical Daisy-Chain Modbus/RS485 Network

The physical wiring connections for a Modbus Network should be made using shielded twisted-

pair wire, from 18 to 24 AWG. Examples of suitable wire are: Belden # 9841, #8761, #3105A, or

equivalent.

Modbus wiring connections are made at terminals 1 and 2 of BCM connector Y2 as shown in

Figure 7-7.

SW1

MODBUS B (+)

BCM FRONT VIEW

7 6 5 4 3 2 1

MODBUS A (-)

Figure 7-7: BCM Modbus (RS485) Connections

MASTER

SLAVE

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 111 112

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Aerco Modulex E8 Controls Guide Manual de usuario Pagina 66