Loma IQ2 User Manual page 102

85
Installing the metal
detector
To reduce the risks of such interference causing false rejects or other symptoms of undesirable
operation at the metal detector, the following recommendations should be followed:
Always route speed controller input and output wiring away from the metal detector area.
NEVER put speed controller wiring in the same conduit or on the same supply as the metal
detector wiring.
Run speed controller wiring in the general vicinity of the metal detector in a rigid steel conduit
or use other techniques to ensure 100% screening of the cable.
Always follow the speed controller manufacturer's instructions for installation, wiring, screening
and grounding.
In addition to following these guidelines, most speed controller manufacturers can supply input
and output filters which can be fitted to the field wiring to dramatically reduce RF emissions if
necessary.
All Loma metal detectors are designed, and tested, to meet the requirements of the FCC and
the new stringent European regulations for RF emissions, both in terms of not emitting
excessively and not being subject to undesirable operation in the presence of other equipment
whose emissions also meet the standards.
This approach allows Loma to offer stable operation even in RF noisy environments, provided
the other equipment is to the same standards and the field wiring is suitable 'hard'.
Control box replaceable fuses
All detector control boxes irrespective of detector type are fitted with three replaceable
fuses: F1 (T2A) Loma part number 517033 located in the incoming ac supply circuit, F2 and
F3 (T5A) Loma part number 517026 located in the reject relay circuits. All the fuses can be
found beneath the power supply safety mesh cover.
F1: If the fuse blows on start up then it may be replaced. However should the fuse blow a
second time then further replacement is not recommended; help should be sought from your
local Service Centre.
F2 and F3: It is recommended to check the circuitry connected to the reject relay to ascertain
the reason for the fuse blowing before replacement.
Before attempting to replace any fuses the following precautions must be observed:
ISOLATE all power to the detector system before commencing work on the power supply
unit.
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