Watlow ez-zone pm - Page 37

Watlow EZ-ZONE
®
PMI Controller • 33 • Chapter 2 Install and Wire
Warning:
ç
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this con-
troller 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)
• 0.56 Nm (5.0 in-lb.) torque
Note:
Adjacent terminals may be la-
beled differently, depending on
the model number
.
Note:
To prevent damage to the con-
troller, do not connect wires to
unused terminals.
Note:
Maintain electrical isolation
between analog input 1, digital
input-outputs, switched dc/open
collector outputs and process
outputs to prevent ground loops.
Note:
This equipment is suitable for
use in CLASS I, DIVISION 2,
Groups A, B, C and D or Non-
Hazardous locations only. Tem-
perature Code T4A
Warning:
ç
Explosion Hazard - Dry contact
closure Digital Inputs shall not be
used in Class I Division 2 Hazard-
ous Locations unless switch used
is approved for this application.
Warning:
ç
Explosion Hazard – Substitution
of component may impair suit-
ability for CLASS I, DIVISION 2.
Warning:
ç
Explosion Hazard - Do not dis-
connect while the circuit is live
or unless the area is known to be
free of ignitable concentrations
of flammable substances.
Input 1, 2 Thermocouple
-
+
S_
R_
Slot A,B
• 2kΩ maximum source resistance
• >20MΩ input impedance
• 3µA open-sensor detection
• Thermocouples are polarity sensitive. The nega-
tive lead (usually red) must be connected to S1
and/or S2.
• To reduce errors, the extension wire for ther-
mocouples must be of the same alloy as the
thermocouple.
Input 1: PM _ [C,R,B
*
] _ _ _ - _ _ _ _ _ _ _ (S1/
R1)
Input 2: PM _ _ _ _ _ - _ [C,R,L] _ _ _ _ _ (S2/R2)
*PM(4, 8 and 9) only
Input 1, 2 RTD
S_
R_
S1
S3
Slot A,B
T_
S_
R_
S1
S2
S3
Slot A, B
• Platinum, 100 and 1kΩ @ 0°C
• Calibration to DIN curve (0.00385
Ω/Ω/°C)
• 20Ω total lead resistance
• RTD excitation current of 0.09mA
typical. Each ohm of lead resis-
tance may affect the reading by
0.03°C.
• For 3-wire RTDs, the S1 lead (usu-
ally white) must be connected to
R1 and/or R2
• For best accuracy use a 3-wire
RTD to compensate for lead-length
resistance. All three lead wires
must have the same resistance
Input 1: PM _ [C,R,B
*
] _ _ _ - _ _ _
_ _ _ _ (S1/R1),(T1/S1/R1)
Input 2: PM _ _ _ _ _ - _ [C,R,L] _ _
_ _ _ (S2/R2), (T2/S2/R2)
*PM(4, 8 and 9) only