- Watlow EZ-ZONE PM Integrated Controller User Manual

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Warning:

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 elec-

trical sensors or peripheral

devices. Failure to do so may

result in damage to equip-

ment and property, and/or

injury or loss of life.

Note:

Maximum wire size termina-

tion and torque rating:

• 0.0507 to 3.30 mm

(30 to

12 AWG) single-wire termi-

nation or two 1.31 mm

(16

AWG)

• 0.8 Nm (7.0 lb.-in.) torque

Note:

Adjacent terminals may be

labeled differently, depend-

ing on the model number.

Note:

To prevent damage to the

controller, do not connect

wires to unused terminals.

Note:

Maintain electrical isolation

between analog input 1, digi-

tal input-outputs, switched

dc/open collector outputs and

process outputs to prevent

ground loops.

Note:

The control output common

terminal and the digital com-

mon terminal are referenced

to different voltages and

must remain isolated.

Watlow EZ-ZONE

PM Integrated Controller • 14 • Chapter 2 Install and Wire

Input 1 Thermocouple

Slot A

• 20 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.

PM6 _ _ _ _-_ _ _ _ A _ _ (all)

Input 1 RTD

2-wire

Slot A

3-wire

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.

PM6 _ _ _ _-_ _ _ _ A _ _ (all)

Input 1 Process

volts

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

PM6 _ _ _ _-_ _ _ _ A _ _ (all)

Input 1 Potentiometer

Slot A

CCW

• Use a 1 kΩ potentiometer.

PM6 _ _ _ _-_ _ _ _ A _ _ (all)