Digital outputs 1 - 12, Switched dc wiring example using do 1-12 – Watlow EZ-ZONE RMH User Manual

Page 30

Watlow EZ-ZONE

RMH Module

•

Chapter 2 Install and Wire

Warning:

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:

Explosion Hazard – Substitution of
component may impair suitability for
CLASS I, DIVISION 2.

Warning:

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.

Digital Outputs 1 - 12

RMH Part # Digit 7, 8 is C

Internal

Common

open collector/switched dc

B_
D_
D_
D_
D_
D_
D_
Z_

Slot D, E

Supply

open collector/switched dc

• Maximum switched volt-

age is 32VÎ (dc)

• Internal supply provides

a constant power out-

put of 750mW

• Maximum output sink

current per output is

1.5A (external class 2 or

*SELV supply required)

• Total sink current for all

outputs not to exceed 8A

• Do not connect outputs in

parallel

- Slot D DO 1 - 6
RMHx-xx(C)x-xxxx

- Slot D DO 7 - 12
RMHx-xxx(C)-xxxx

*Safety Extra Low Voltage

Open Collector/Switched

DC Outputs

Switched DC Wiring Example Using DO 1-12

VDC

Collector Outputs

Internal Circuitry

Common

Internal Supply

DC90-60C0-0000

Htr 3

Htr 2

Htr 1

Note:

As a switched DC output; this output is a constant current output deliver-

ing 750 mW, current limited to 400 mA. The internal supply does have a

maximum open circuit voltage of 22 VDC and minimum open circuit volt-

age of 19 VDC. Pin Z_ is shared to all digital outputs. This type of output is

meant to drive solid state relays, not mechanical relays.

Suppressor Note:
Switching pilot duty inductive loads
(relay coils, solenoids, etc .) with the
mechanical relay, solid state relay or
open collector output options requires
use of an R .C . suppressor for AC load or
a diode for a DC load .