Watlow EZ-ZONE RMH - Manual (Page 27)

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.
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.
Watlow EZ-ZONE ® RMH Module • 24 • Chapter 2 Install and Wire
High Density Module Wiring (RMHx-xxxx-xxxx)
Low Power
RMH- ALL Model Numbers
98 99
Slot C
power
• 20.4 to 30.8 V Å (ac) / Î (dc)
• 47 to 63 Hz
• Controller module power consumption, 7 Watts maxi-
mum, 14VA
• 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
compliance standards
Communications
RMH Part # Digit 10 is A
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 Communica-
tions
• Do not route network wires with power wires. Connect
network wires in daisy-chain fashion when connecting
multiple devices in a network
Communications
RMH Part # Digit 10 is 1
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 EIA-485
Communications (selectable via push button under
zone address)
• CZ, CX, CY - Inter-module Bus EIA-485 Communica-
tions
• Do not route network wires with power wires. Con-
nect network wires in daisy-chain fashion when con-
necting multiple devices in a network
Modbus-IDA
Terminal
EIA/TIA-
485 Name
Watlow Ter-
minal Label
Function
DO A CA or CD T-/R-
D1 B CB or CE T+/R+
common common CC or CF common
Inputs 1 through 16 Thermocouple
RMH Part # Digits 5, 6, 7, 8
-
+
-
+
-
+
-
+
Thermocouple
S_
R_
S_
R_
S_
R_
S_
R_
Slot A, B, D, E • 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): 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