5-7
G-Tek Corporation
Installation
5.1
E
LECTRICAL
I
NSTALLATION
5.1.1
General Information
To comply with Underwriter Laboratories (UL) and Canadian Standards Association (CSA) certification,
route signal leads and power cables in earthed (grounded), flexible metal conduit.
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Instruments not fitted with the optional internal on/off switch and fuse must have a
disconnecting device such as a switch or circuit breaker conforming to local safety
standards
fitted to the final installation. It must be fitted in close proximity to the instrument within easy
reach of the operator and must be marked clearly as the disconnection device for the
instrument.
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Remove all power from supply, relay and any powered control circuits and high common
mode voltages before accessing or making any connections.
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Use cable appropriate for the load currents. The terminals accept cables up to 14AWG
(2.5mm1).
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The instrument and all inputs and outputs conform to Mains Power Input Insulation
Category
ll.
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All connections to secondary circuits must have basic insulation.
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After installation, there must be no access to live parts e.g. terminals.
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Terminals for external circuits are for use only with equipment with no accessible live parts.
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If the instrument is used in a manner not specified by the Company, the protection provided
by the equipment may be impaired.
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All equipment connected to the instrument's terminals must comply with local safety
standards (IEC 60950, EN601010-1).
NOTE:
In order to ensure maximum GSM Dialer performance, proper wiring installation practices must be
followed. Failure to do so can result in a range of problems, from loss of configuration to component
failure, caused by transmitted or radiated electrical noise. Proper consideration must be given to local
noise sources and appropriate suppression steps taken to minimize any potential problems. Among
the most common sources of noise are: Relays, SCRs, valve solenoids, electric motors, power line
disturbance, wire-to-wire coupling, electrostatic discharge (ESD) and radio-frequency interference
(RFI).
To achieve the best results, the following notes should be considered:
1.
Signal input wiring should be twisted pairs/triplets etc. The conductors should be stranded
rather than solid in construction. All signal wiring should use ground-shielded wires, or be
routed through grounded conduit to minimize the effects of RFI and ESD.
2.
Special care should be taken when wiring to relay or solenoid coils, as large transients are
produced when coils (or any other inductive loads like motors or arc welding equipment’s etc.)
are switched. This problem can be eliminated by the use of suitable suppression devices across
the coil. Coil transients can also be transmitted through the air, so the recorder itself should
be mounted as far as possible from power control devices and/or wiring.
