Automated Logic U551 Petunjuk Teknis - Halaman 2

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Using the U55 1

The U551 is part of a family of control

modules designed specifically for heat pump

and fan coil applications. The U551 has:

• five digital outputs

• two LogiStat inputs

• three general purpose inputs

• one analog output

The U551 communicates with other U-Line

modules on the Unet using BACnet MS/TP

protocol over EIA-485 twisted pair wire. The

U551 module communicates with the CMnet

through Unet Interface modules (UNIs). The

UNI must use one of the following module

drivers to communicate with the U551:

• For WebCTRL systems, the DRV_UNI16

or DRV_UNI32 module driver

• For SuperVision systems, the U1M,

U3M, U5M, or UNM module driver

If communication with the UNI is lost, the

U551 can be programmed with a backup

default algorithm to maintain space

temperature. Refer to the appropriate UNI

module driver technical instruction for

instructions on setting up this default

algorithm.

The U551 module is programmed with a

Graphic Function Block (GFB), which is

transferred into the UNI. Depending on the

software you are using, GFBs written for U-

Line modules must be created in Eikon for

WebCTRL or Eikon using the Zone GFB

option; refer to the Eikon for WebCTRL User's

Guide or the Eikon User's Guide for more

information.

NOTE To operate this module based on a

schedule, the UNI must be networked with a

gateway module.

Revised 8/14/02 • U551

U551 modules have been designed to meet

low-end, high-volume terminal control

applications. As a result, time-critical

applications (such as short time delays and

trend intervals of less than one minute)

should not be used with these modules. ALC

recommends that all time delay functions and

trend intervals in U551 FBs be set to at least

one minute.

CAUTION If the equipment is used in a

manner not specified by the manufacturer,

the protection provided by the equipment

may be impaired.

Specifications

Power 24VAC ±10%, 12VA, 50-60Hz.

Inputs three inputs configurable for

thermistor, 0 to 5VDC, or dry contact; two

LogiStat inputs.

Input Resolution 10 bit.

Digital Outputs five relay outputs, rated

at 1A.

Analog Outputs one analog output, 0-

10VDC, 5mA maximum drive capability.

Output Resolution 8 bit.

Communication 9600 bps or 38.4 kbps,

automatically detected (determined by

UNI module).

Environmental Operating Range 0 to

130 °F (-17.8 to 54.4 °C); 5 to 95% relative

humidity, non-condensing.

Status Indication Visual (LED) indicators.

Memory 60KB Flash EPROM and 2KB of

RAM, 8KB non-volatile storage for

default algorithm and configuration data.

Protection Metal oxide Varistor (power,

analog inputs, and output relay).

Transient voltage suppressor (analog

output). Zener and opto isolation

protection (communications).

Listed by PAZX (UL 916).