Thermcraft XST-3-0-36-3V - Manual (Page 140)

Safety Information Installation and Operation Handbook
B-2 2408 and 2404 Controller
Electrostatic discharge precautions
When the controller is removed from its sleeve, some of the exposed electronic components
are vulnerable to damage by electrostatic discharge from someone handling the controller. To
avoid this, before handling the unplugged controller discharge yourself to ground.
Cleaning
Do not use water or water based products to clean labels or they will become illegible.
Isopropyl alcohol may be used to clean labels. A mild soap solution may be used to clean
other exterior surfaces of the product.
INSTALLATION SAFETY REQUIREMENTS
Safety Symbols
Various symbols are used on the instrument, they have the following meaning:
Caution, (refer to the
accompanying documents) Functional earth
(ground) terminal
!
The functional earth connection is not required for safety purposes but to ground RFI filters.
Personnel
Installation must only be carried out by suitably qualified personnel.
Enclosure of live parts
To prevent hands or metal tools touching parts that may be electrically live, the controller
must be installed in an enclosure.
Caution: Live sensors
All isolated inputs and outputs have reinforced insulation to provide protection against
electric shock. The non-isolated dc, logic and PDSIO outputs are all electrically connected to
the main process variable input, (thermocouple etc.). If the temperature sensor is connected
directly to an electrical heating element then these non-isolated inputs and outputs will also
be live. The controller is designed to operate under these conditions. However you must
ensure that this will not damage other equipment connected to these inputs and outputs and
that service personnel do not touch connections to these i/o while they are live. With a live
sensor, all cables, connectors and switches for connecting the sensor and non-isolated inputs
and outputs must be mains rated.
Wiring
It is important to connect the controller in accordance with the wiring data given in this
handbook. Take particular care not to connect AC supplies to the low voltage sensor input or
DC or logic inputs and output. Only use copper conductors for connections (except
thermocouple inputs) and ensure that the wiring installations comply with all local wiring
regulations. For example in the UK use the latest version of the IEE wiring regulations,
(BS7671). In the USA use NEC Class 1 wiring methods.