Issue 2.1
A connection to the earth line must be made to ensure safe operation and compliance with EMC
regulations.
To ensure conformance with EN60950:
(A) For installations where the 470/474A clock is to be permanently connected into the mains
power circuit, a readily accessible disconnect device should be incorporated in the fixed wiring.
(B) For installations where the 470/474A clock is to be plugged into the mains power circuit, a
socketed outlet should be installed near the equipment and should be easily accessible.
All installation work should be performed in accordance with the Sixteenth Edition of the IEE
Wiring Regulations, or equivalent local standard.
When time zone displays are used as stand-alone units an internal automatically recharging battery will, when
fully charged, maintain the internal time count, for a period normally in excess of 24 hours, if the mains
supply is interrupted.
The power supply is fitted with an internal fuse. In case of fault the fuse should only be replaced with a fuse of
the same rating, by a suitably qualified engineer after disconnection from the mains power supply and
correction of the fault condition.
External Signal Connection
A six way terminal block is located on the rear panel of the clock to enable the connection of external signals,
radio time code receivers and slave displays. Details of the connections for various signal configurations are
detailed on page 16.
The mains power supply must be disconnected when making connections to external signals.
Clocks supplied for ceiling suspension are supplied with flying leads to allow for external connection of mains
power and synchronisation signal. Please specify external synchronisation type at time of order to ensure that
the 470/474A time zone display is supplied correctly configured.
System Programming
470A series time zone displays are normally supplied factory programmed to operate in accordance with the
customer’s order specification. The program settings may be checked or altered at any time by following the
steps detailed on pages 5 to 11 of this manual. In case of doubt please do not hesitate to contact your
supplier or our factory technical support.
408 Remote Control
A 408 Remote control unit is available for to allow remote programming of your 470/474A series time zone
display. The 408 Remote control has a range of 3 metres and replicates the buttons located on the rear of the
time zone display. When the remote control is used with 474A style time zone displays the remote should be
aimed towards the right most time zone when the buttons are pressed. With a 470A time zone display the
remote control should be pointed towards the bottom time zone.
If you would like to purchase a 408 Remote control for use with a 470/474A series time zone display, please
contact your local sales representative.
Guarantee
The 470A series time zone displays are fully guaranteed, on a return to works basis, against failure due to
faulty parts or workmanship for one year from date of purchase. In the event of failure, either within or
outside the warranty period, please pack the unit with care and return it to our factory for examination and
repair.
Introduction - 2
2
(5 pages)
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