Rockwell Automation T8442 Trusted TMR Speed Monitor - Manual (Page 19)

Trusted
TM
Module T8442
Issue 8 Apr 10 PD-T8442 19
2. Installation
2.1. Module Insertion/Removal
CAUTION:
The module contains static sensitive parts. Static handling precautions must be observed. Specifically
ensure that exposed connector pins ARE NOT TOUCHED. Under no circumstances should the
module housing BE REMOVED.
Before installation, visually inspect the module for damage. Ensure that the module housing appears
undamaged and inspect the I/O connector at the back of the module for bent pins. If the module
appears damaged or any pins are bent, do not install the module. Do not try to straighten bent pins.
Return the module for replacement.
Ensure that the module is of the correct type.
Record the module type, revision and serial number of the module before installation.
To install the module:
1. Ensure that the field cable assembly is installed and correctly located.
2. Release the ejector tabs on the module using the release key. Ensure that the ejector tabs
are fully open.
3. Holding the ejectors, carefully insert the module into the intended slot.
4. Push the module fully home by pressing on the top and bottom of the module fascia.
5. Close the module ejectors, ensuring that they click into their locked position.
The module should mount into the chassis with a minimum of resistance. If the module does not
mount easily, do not force it. Remove the module and check it for bent or damaged pins. If the pins
have not been damaged, try reinstalling the module.
2.2. External Interfaces
2.2.1. Speed Output Signals
Speed output signals are from normally energised relays with both normally open (de-energize to trip)
and normally closed (energize to trip) volt free contacts available. Hardware fault tolerance is
maintained through the use of a quad relay structure with shared paths.
Each group provides an output signal for over-speed and also for over-acceleration.
2.2.2. Speed Input Signals
The speed inputs are arranged as three groups of three inputs. Each external speed sensor input on
the module is monitored by three separate speed monitoring circuits.
Hardware fault tolerance is provided for each sensor input on the module .
2.2.3. Communications
The only external communication interface available to the T8442 Speed Monitor is the Trusted TM
system IMB.
The Trusted TM system architecture allows many intermediate transport methodologies between the
IMB on an I/O chassis and the IMB on the main controller chassis.