User guide

Watlow EZ-ZONE
®
RMH Module • 25 • 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 controller to a power
source and to electrical sensors or pe-
ripheral 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 in-lb.) torque
Note:
Adjacent terminals may be labeled
differently, depending on the model
number.
Note:
To prevent damage to the controller,
do not connect wires to unused ter-
minals.
Note:
Maintain electrical isolation between
digital input-outputs, switched dc/open
collector outputs and process outputs
to prevent ground loops.
Warning: ç
Explosion Hazard – Substitution of
component may impair suitability for
CLASS I, DIVISION 2.
Warning: ç
Explosion Hazard - Do not disconnect
while the circuit is live or unless the
area is known to be free of ignitable
concentrations of flammable sub-
stances.
Inputs 1 through 16 Potentiometer
S_
R_
S_
R_
S_
R_
S_
R_
Slot A, B, D, E
CW
CCW
CW
CCW
CW
CCW
CW
CCW
• Use a 1 kΩ potentiometer.
Input 1 - 4 (top to bottom): RMHx-(1)xxx-xxxx
Input 5 - 8 (top to bottom): RMHx-x(1)xx-xxxx
Input 9 - 12 (top to bottom): RMHx-xx(1)x-xxxx
Input 13 - 16 (top to bottom): RMHx-xxx(1)-xxxx
Inputs 1 through 16 RTD
RMH Part # Digits 5, 6, 7, 8
2-wire
RTD
S_
R_
S_
R_
S_
R_
S_
R_
Slot A, B, D, E
• platinum, 100 and 1,000 Ω @ 0°C
• calibration to DIN curve (0.00385
Ω/Ω/°C)
• RTD excitation current of 0.09
mA typical. Each ohm of lead
resistance may affect the reading
by 2.55°C for a 100 ohm platinum
sensor or 0.25°C for a 1000 ohm
sensor.
Input 1 - 4 (top to bottom): RM-
Hx-(1)xxx-xxxx
Input 5 - 8 (top to bottom): RM-
Hx-x(1)xx-xxxx
Input 9 - 12 (top to bottom): RM-
Hx-xx(1)x-xxxx
Input 13 - 14 (top to bottom):
RMHx-xxx(1)-xxxx
AWG Ohms/1000ft
14 2.575
16 4.094
18 6.510
20 10.35
22 16.46
24 26.17
26 41.62
28 66.17
Inputs 1 through 16 Thermistor
RMH Part # Digits 5, 6, 7, 8
Thermistor
S_
R_
S_
R_
S_
R_
S_
R_
Slot A, B, D, E
• >20 MΩ input impedance
Input 1 - 4 (top to bottom): RMHx-(2)xxx-
xxxx
Input 5 - 8 (top to bottom): RMHx-x(2)xx-
xxxx
Input 9 - 12 (top to bottom): RMHx-xx(2)x-
xxxx
Input 13 - 16 (top to bottom): RMHx-xxx(2)-
xxxx