Automated Logic U551 Petunjuk Teknis - Halaman 5

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VA (transformer)

VA (module) + VA (accessories)

Figure 3. Figuring Maximum Number of Modules

100VA

9VA + 6VA

Figure 4. Example of Figuring Maximum Number

of Modules

A +10V output is also available to power the

optional UASF device for dual duct systems.

The U551 has an operating range of 21.6VAC

to 26.4VAC. Whenever possible, connect and

verify power and communications to all

modules before connecting any inputs or

outputs.

1. Remove the U551's power jumper or place

it in the off position. This prevents the

module from being powered up before

verifying correct voltage.

2. Make sure the 24VAC power source is off.

3. Connect the power wires to the module's

power terminals labeled 24VAC and Gnd.

4. Turn the 24VAC power source on.

5. Make sure that 24VAC is present at the

module's power input terminals.

6. Set the module's address. Refer to

"Addressing" on page 4 for details.

7. Replace the module's power jumper or

place it in the on position.

When the module turns on, the Run LED

turns on and begins blinking. The Run

LED blinks once every two seconds until

communication is established, then blinks

twice per second when operating

normally. Refer to "LEDs" on page 11 for

more information.

Revised 8/14/02 • U551

Maximum #

of modules

(rounded down)

6.67 or

6 modules maximum

Communications Wiring

There is a special wire available that contains

a pair of 14AWG wires for power and a pair of

22AWG wires for communication. See "Power

Wiring" on page 4 for details.

Note that the communication wire is

unshielded. Shielded cable is not required for

the Unet.

In most circumstances, you should have a

PROT485 within 250 feet of any U-line

module on the Unet for surge protection.

However, depending on the frequency of

electrical surges in your area, the 250-foot

recommendation may vary. For example, if

you have frequent electrical storms in your

area, you may want to use more PROT485s; if

you have few electrical storms, you may want

to use fewer PROT485s. If the entire Unet is

less than 250 feet, place at least one PROT485

at the opposite end of the network from the

UNI. For details about the PROT485, refer to

the ARC156 CMnet Wiring Technical

Instructions. Make sure that all modules and

the PROT485 use the same polarity

throughout the Unet. You must use a repeater

after every 32 modules or 3,000 feet.

The Unet baud rate is determined by the UNI

module and is automatically detected by the

U551. You can set or change the Unet baud

rate to 9600 bps or 38.4 kbps on the UNI. The

U551 begins using the new baud rate after ten

seconds.

If the module is not communicating with the

UNI, the module's color is as follows:

• For WebCTRL systems, the module's

color is purple.

• For SuperVision systems, the module's

color is coral.

1. Remove the module's power jumper or

place it in the off position.