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Access to settings
Facilities for all configuration settings are
to be found on the printed ciruit board.
Change in AC mains supply, hysteresis
settings, high or low operation and
interlock mode may be set using links and
controls provided.
Opening the module
(i) Isolate all supplies to the unit.
(ii) Unscrew two module retaining screws
and separate the plug-in module from
the base section.
(iii) With the fingers, ease apart the longer
sides of the cover releasing the
interlocking tongue and groove
fastenings to remove the plastic plate
with the connections label.
(iv) Slide out the printed circuit board
(pcb) noting the location and
orientation of the pcb.
NB the pcb will remain attached to the
front panel controls but may be
disconnected from the cover by
unplugging the connector.
Re-assembly
(i) Slide the printed circuit board into the
correct slot in the cover (i.e. ensuring
the LED indicators align with their
windows in the front panel).
(iii) Replace the plastic plate by first
engaging the side with the two
tongues into their slots in the case
then press the plate home to engage
the single tongue.
(iv) Insert the plug-in module into the base
section and secure with the retaining
screws. NB do not over tighten.
Internal Controls and Links
Interlocked Output
This mode is enabled by LK5 (see Fig 1).
Two modes of interlock operation are
possible which are selected by the Switch
A / Switch B High - Low settings. See the
Interlocked Operation section for a
detailed explanation of this function.
Changing supply voltage
Please Note: The operating voltage of DC
powered versions cannot be changed.
Details of the linking arrangements for AC
supplies are shown in Fig 1. The required
tappings are made by soldering tinned
copper wire links.
IMPORTANT - Links for 110V operation
must be insulated with silicon rubber
sleeving.
Fuse replacement
See Fig 1 for location of fuse and fuse
ratings. Fuse size: 20mm x 5mm dia.
Hysteresis
Hysteresis is set during calibration at
±1% of span as standard. The amount of
adjustment on the hysteresis controls give
a maximum hysteresis of ±5%. See Fig 1
for location of the hysteresis controls.
NB The controls may be clockwise or
anti-clockwise types for increasing
hysteresis. Spectrol types are clockwise,
Bourns are anti-clockwise.
High - Low Selection
The High - Low switches determine
whether the output relay energises when
the input signal is below the trip point
(LOW setting) or above the trip point
(HIGH setting) - see Fig 1.
