Watlow Ez-Zone PM8 - Input 1 Potentiometer; Input 1 Process; Input 1 RTD; Input 1 Thermocouple

Watlow EZ-ZONE
®
PM PID Controller • 15 • Chapter 2 Install and Wire
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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
2
(30 to
12 AWG) single-wire termi-
nation or two 1.31 mm
2
(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.
Input 1 Thermocouple
-
+
S1
R1
Slot A
• 2kΩ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.
PM _ _ _ _ _-_ AAAA _ _
Input 1 RTD
2-wire
S1
R1
S1
S3
Slot A
3-wire
T1
S1
R1
S1
S2
S3
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 _ _ _ _ _-_ AAAA _ _
Input 1 Process
-
+
S1
R1
volts
Slot A
-
+
T_
S_
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 _ _ _ _ _-_ AAAA _ _
Input 1 Potentiometer
pot
S1
R1
Slot A
CW
CCW
• Usea1kΩpotentiometer.
PM _ _ _ _ _-_ AAAA _ _