Automated Logic U253 Technische instructies - Pagina 8

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1. Insert wire

into opening

Figure 8. Flip Lever Wiring

Refer to the section "Writing GFBs for the

U253" on page 9 for more information about

using a LogiStat sensor.

Digital Output Wiring

The U253 has two digital outputs that can be

connected to a maximum of 24 Volts AC/DC

(see Figure 9). Each output is a dry contact

(rated at 1A maximum) that is configured as

normally open.

DO-2

DO-1

BUSS

Figure 9. Digital Output Wiring

Be sure the module's power is off before

connecting any inputs or outputs.

To verify each output's operation, lock the

output to a known condition using the

Function Block's Properties page in WebCTRL

or the Parameter page in SuperVision, then

make sure the equipment operates as

specified.

Analog Output Wiring

The U253 has three analog outputs that

support voltage devices from 0 to 10VDC (see

Figure 10). The device being controlled must

have a minimum of 2000 Ohms resistance

measured from its input to ground and must

Revised 8/14/02 • U253

2. Press black

tab down to

connect wire

Gnd

24VAC

Gnd

AO-1

Figure 10. Analog Output Wiring

Be sure the U253's power is off before wiring

any inputs or outputs. Connect the output

wiring to the screw terminals on the module.

To verify each output's operation, lock the

output to a known condition on the Function

Block's Properties page in WebCTRL or the

Parameter page in SuperVision, then make

sure the equipment operates as specified.

Using Flow Sensors

The U253 controls air flow in the zone using:

• a USF (single) air flow sensor and an

actuator connected to two digital

outputs

If you use a flow sensor with the U253, use

the Airflow microblock in the U253's GFB.

To connect the sensor, make sure the U253's

power is off first. Attach the total or high

pressure line from the VAV box to the

module's HI side, and attach the static

pressure line to the module's LO side.

Connect the USF to the U253 as shown in

Figure 11 on page 9.

To ensure an accurate reading from the flow

sensor, use the Airflow microblock in the

module's GFB. You must calibrate this

microblock using the instructions on the FB's

Properties page in WebCTRL or Parameter

page in SuperVision. Refer to the Eikon for

WebCTRL Microblock Reference Guide or the

Eikon Microblock Reference Guide for more

information.

0 to 10V