2. INSTALLATION INSTRUCTIONS
2.1 EMC Requirements
For optimum EMC performance use shielded multi-core cables for connection to this
instrument; the cable shield may be terminated by means of a short "pig-tail" and
connected to the terminals marked:
(a) Pin 5 – Transducer cable
(b) Pin 15 – Supply/Output cable
The DIN-rail to which the unit is attached should be earthed.
The screw clamp terminals can accept either solid or stranded wire sizes from 0.2 mm (24
AWG) to 2.5 mm (12 AWG).
NOTES:
1. Cable shields to be grounded at only one end - the DR7AC end, although grounding
at both ends may reduce the effects of high frequency EMI.
2. When the DR7AC is a small part of a large electrical installation, ensure the cables
to and from the DR7AC are segregated from electrically noisy cables.
3. Ensure cables to and from the DR7AC are routed away from any obviously powerful
sources of electrical noise, e.g. electric motor, relays, solenoids.
4. ESD precautions should be used when working on the instrument with the lid
removed. The user should ensure he is "grounded" by use of an earthed wrist strap
or at least touching earth before touching any component including wires, terminals
or switches.
5. The transducer body should be grounded. Some transducers such as LVDTs, load
cells, etc. without an internal body-to-shield connection, require a separate earth.
This should preferably be connected to the instrument shield terminal or as near
(electrically) as possible to this point.
2.2 Unit Mounting
The DR7AC housing is a standard DIN rail enclosure which can clip directly to a 35 mm
top hat rail. The units can be mounted side by side if in an ambient temperature up to
40C. Above this temperature, a gap of 15 mm should be left in between each unit.
To Next Page
Loading...