Watlow EZ-ZONE RM Limit Module Rev C - Manual (Page 23)

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 mm2 (30 to 12 AWG)
single-wire termination or two 1.31
mm2 (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.
Watlow EZ-ZONE ® RML Module • 20 • Chapter 2 Install and Wire
Limit Module Wiring (RMLx-xxxx-xxxx)
Inputs 1 through 12 Thermocouple
-
+
-
+
-
+
-
+
Thermocouple
S_
R_
S_
R_
S_
R_
S_
R_
Slot A, B, D
• 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 S terminal
• To reduce errors, the extension wire for thermocouples must be of the
same alloy as the thermocouple.
Input 1 - 4 (top to bottom): RMLx-(5)xxx-xxxx
Input 5 - 8 (top to bottom): RMLx-x(5)xx-xxxx
Input 9 - 12 (top to bottom): RMLx-xx(5)x-xxxx
CC CA CB CZ CX CY
Slot C
T+ / R+
Modbus Common
T- / R- Inter-module Bus Common
+ -
• CC, CA, CB - Modbus and Standard Bus EIA485 Communi-
cations (selectable via push button under zone address)
• CZ, CX, CY - Inter-module Bus EIA485 Communications
• Do not route network wires with power wires. Connect net-
work wires in daisy-chain fashion when connecting multiple
devices in a network
RML Part # Digit 10 is 1
Communications
CF CD CE CZ CX CY
Slot C
Standard Bus Common T- / R- Inter-module Bus Common - +
T+ / R+
• CF, CD, CE - Standard Bus EIA485 Communications
• CZ, CX, CY - Inter-module Bus EIA485 Communications
• Do not route network wires with power wires. Connect
network wires in daisy-chain fashion when connecting
multiple devices in a network
Communications
RML Part # Digit 10 is A
Low Power
• 20.4 to 30.8 V Å (ac) / Î (dc)
• 47 to 63 Hz
• Module maximum power consumption, 14 VA (ac), 7 VA
(dc)
• 31 Watts maximum power available for P/S part #:0847-
0299-0000
• 60 Watts maximum power available for P/S part #:0847-
0300-0000
• 91 Watts maximum power available for P/S part #:0847-
0301-0000
• Class 2 or SELV power source required to meet UL compli-
ance standards
RML- ALL Model Numbers
98 99
Slot C
power
RML Part # Digits 5, 6, 7