Autostart 700 (models AS3/E....)
Engine/Generator Controllers
mi6429
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6 October 2006
Application note: internal battery replacement
Note: It is your responsibility to ensure that qualified mechanical and electrical technicians install and service this
product. If in doubt, please contact your local Murphy representative.
Description
Autostart 700 series engine/generator controllers (with part
number prefix AS3/E...) are fitted with an internal 9 VDC
(PP3 size) NiCd or NiMH battery. The battery maintains the
Autostart power supply during engine cranking, when the
main engine battery pack voltage can fall below 5 VDC.
The Autostart internal battery has an anticipated service life of
between 5 and 8 years, after which time the battery typically
fails to store sufficient charge. Higher ambient temperatures
typically result in shorter battery life.
At the end of the battery’s life, Autostart operation typically
continues unaffected so long as the main engine battery
voltage remains above 5 VDC. However, supply brown-out
voltages below 5V can cause a complete or partial Autostart
power-down, which may result in drop-out of the start or fuel
outputs, or spurious fault indication and shutdown.
Factory repair or battery replacement is typically uneconomic,
but on-site replacement of the battery is possible.
Battery replacement
WARNING: The following procedure requires
dismantling and handling of internal
components, with risk of permanent
component damage. Before beginning:• ensure isolation of all DC and AC supplies,
and disconnection of all electrical wiring
• observe static sensitive precautions,
including earthed wrist bands and mat.
• where possible, avoid direct handling of
electronic components and circuits.
Murphy cannot accept liability for units that
have been repaired, modified or adjusted
outside of our quality control system, nor for
any subsequent personal injury or damage
to connected equipment. Product warranty
may also be invalidated.
If in doubt, please contact our technical
sales department for further advice.
3. Remove the Autostart circuit board assembly out of the
back of the unit. The top side covering plate may need to
be raised slightly so that it clears switches 1 – 5 on the
top circuit board.
The battery sits on the lower circuit board, either in its own
plastic support with connectors, or (as shown above) glued
and/or zip-strapped directly onto the circuit board with
connections by flying lead. If the (large/heavy) battery has
come loose, it may be possible that internal components are
damaged.
If no other components are damaged, fit and secure the new,
fully charged battery. If a replacement 9V NiCd battery is not
available, a 9V NiMH (Nickel-Metal-Hydride) equivalent may
also be used.
Re-assemble the Autostart in reverse order to the
disassembly sequence. A thorough test of operation is
recommended:• Check automatic startup and shutdown cycle
• Check manual startup and shutdown cycle
• Check all fault shutdown conditions (oil pressure,
overspeed, etc).
Remove the circuit board assembly from the case as follows:1. Remove the 8 screws at the rear of the Autostart, then
remove the plastic 'H' shaped bar and 2 terminal covers.
2. On the front facia, unscrew the keyswitch bezel. A large
pair of pliers is normally sufficient, with the jaws wrapped
in insulation tape to minimise bezel scratching.
Further information:Document
Description
ms5893
mi5316
Autostart 700 sales bulletin/specification
Autostart 700 installation reference sheet
FRANK W MURPHY LTD.
Church Road, Laverstock, Salisbury, SP1 1QZ, United Kingdom
tel: +44 (0)1722 410055 fax: +44 (0)1722 410088
email: [email protected] web: www.fwmurphy.co.uk
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
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