Watlow EZ-ZONE PM Manual do Utilizador descarregar pdf (Página 23)

Warning: Óç

Use National Electric (NEC) or other

country-specific standard wiring and

safety practices when wiring and

connecting this controller to a power

source and to electrical sensors or

peripheral devices. Failure to do so

may result in damage to equipment

and property, and/or injury or loss

of life.

Note:

Maximum wire size termination and

torque rating:

• 0.0507 to 3.30 mm

(30 to 12

AWG) single-wire termination or

two 1.31 mm

(16 AWG)

• 0.8 Nm (7.0 lb.-in.) torque

Note:

Adjacent terminals may be labeled

differently, depending on the model

number.

Note:

To prevent damage to the control-

ler, do not connect wires to unused

terminals.

Note:

Maintain electrical isolation be-

tween Analog Input 1, Digital I/O,

Switched dc/open collector outputs

and Process outputs to prevent

ground loops.

Note:

The control output common

terminal and the digital common

terminal are referenced to different

voltages and must remain isolated.

Watlow EZ-ZONE

PM Limit Controller • 20 • Chapter 2 Install and Wire

Input 1 Thermocouple

Thermocouple

(Input 1)

Slot A

• 2KΩmaximumsourceresistance

• >20MΩinputimpedance

• 3microampereopen-sensordetection

• Thermocouplesarepolaritysensitive.Thenegativelead(usually

red)mustbeconnectedtoS1.

• Toreduceerrors,theextensionwireforthermocouplesmustbe

of the same alloy as the thermocouple.

Input1:PM_ _ _ _ _ - _ _ _ _ _ _ _(S1/R1)

Input 1 RTD

2-wire

RTD

(Input 1)

Slot A

3-wire

RTD

(input 1)

Slot A

• platinum,100and1,000Ω@0°C

• calibrationtoDINcurve(0.00385Ω/Ω/°C)

• 20Ωtotalleadresistance

• RTDexcitationcurrentof0.09mAtypical.Each

ohm of lead resistance may affect the reading by

0.03°C.

• For3-wireRTDs,theS1lead(usuallywhite)must

beconnectedtoR1.

• Forbestaccuracyusea3-wireRTDtocompensate

for lead-length resistance. All three lead wires must

have the same resistance.

PM _ _ _ _ _-_ _ _ _ AAA (all)

Input 1 Process

volts

Process

(Input 1)

Slot A

amperes

Slot A

• 0to20mA@100Ωinputimpedance

• 0to10VÎ(dc)@20kΩinputimpedance

• 0to50mVÎ(dc)@20kΩinputimpedance

• scalable

PM _ _ _ _ _-_ _ _ _ AAA (all)

Input 1 Potentiometer

pot

(input 1)

Slot A

CCW

• Usea1kΩpotentiometer.

PM _ _ _ _ _-_ _ _ _ AAA (all)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 110 111

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