Table of Contents
Advertisement
Each redundant supply must be able to provide the full load, no facility for load
sharing is provided, and the higher of the two applied voltages powers the
module.
There are internal protective (non-replaceable) fuses on each of the power
inputs and on the bus supply to the expansion modules. In addition, there is
similar protection on each of the (main and expansion) modules.
The expansion modules are only powered by the bus and from a main module
base. Removal of any module (main or expansion) does not affect power
distribution to any other module in a system.
Grounding Scheme
The system is isolated from ground and to maintain isolation between multiple
interconnected modules, whether they are main or expansion modules.
Shield connections are common to one another for each module and its
terminal base, but otherwise isolated from the module circuitry. These
connections are provided as a termination point for cable screens/shields and,
where applicable, for protective ground connections to accessible metal parts.
One or more must be used to connect the Shield bus to a local ground as the
base module is not grounded to the DIN rail.
Use these grounding requirements to verify the safest electrical operating
circumstances and to help avoid EMI and ground noise that can cause
unfavorable operating conditions for the system:
• Module Grounding - Provide AWG 16 connection to ground for each
Dynamix 1444 Series system module to an available Shield connection
terminal.
• 24V Common Grounding - Given that module power supplies are
galvanically isolated, it is recommended that the DC voltage supply
return line to the Dynamix modules is grounded.
• Transducers – Verify that transducers are electrically isolated from
ground. Cable shields must be grounded at one end of the cable and the
other end not connected. It is recommended, where possible, to ground
the cable shield at the instrument side (PE terminals, protective Earth
Ground bar, or cable glands) and not at the transducer end.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Install the Dynamix 1444 Series Monitoring System
Chapter 2
37
Hide quick links:
Advertisement
Table of Contents
