Watlow EZ-ZONE PM - Manual (Page 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 2 (30 to 12
AWG) single-wire termination or
two 1.31 mm 2 (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)
L1
K1
J1
L2
K2
T1
S1
R1
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)
L1
K1
J1
L2
K2
T1
S1
R1
S1
S3
Slot A
3-wire
RTD
(input 1)
L1
K1
J1
L2
K2
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 _ _ _ _ _-_ _ _ _ AAA (all)
Input 1 Process
-
+
L1
K1
J1
L2
K2
T1
S1
R1
volts
Process
(Input 1)
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 _ _ _ _ _-_ _ _ _ AAA (all)
Input 1 Potentiometer
pot
(input 1)
L1
K1
J1
L2
K2
T1
S1
R1
Slot A
CW
CCW
• Use a 1 kΩ potentiometer.
PM _ _ _ _ _-_ _ _ _ AAA (all)