Energy Tech Laboratories EDP70 - Manual (Page 6)

page 6 -- MI00/10056 rev.1--05/2001
1.0 INTRODUCTION
1.1 Summary of the manual
This handbook provides for the safe installation, startup and use of the EDP70 PLUS Uninterruptible Power
System (UPS). The Company recommends that the equipment be installed and regularly maintained by a
Chloride Authorized personnel.
DO: - read the User Handbook before operating the EDP70 PLUS UPS.
- keep a log of all incidents.
- protect the batteries from damage. Batteries leak acid; avoid contact with skin,
clothes or eyes.
DO NOT: - operate the control switches.
- operate the EDP70 PLUS UPS with any covers removed.
- obstruct the ventilation grilles.
1.2 Summary of the equipment
The EDP70 PLUS Uninterruptible Power System (UPS) totally isolates the load from voltage drops, spikes,
transients frequency variations in the utility supply.
In the event of failure or brownout of the AC utility supply, an internal audible alarm sounds and an LED on the
control panel illuminates, the EDP70 PLUS UPS will continue to provide safe, clean continuous power, without
interruption, from the battery, for a duration dependent on battery capacity and output load.
The audible alarm alerts the user to start a safe orderly shutdown of the load. When the AC utility supply returns to
normal, the EDP70 PLUS UPS automatically recharges the battery ready for any future power failure.
The microprocessor display panel provides access to very detailed information regarding the status of the supplies
and EDP70 PLUS UPS. Refer to current publication for detailed specification.
The block diagram, shows the main functional sub-assemblies of the EDP70 PLUS UPS. The AC three phase
utility supply is rectified to provide direct current, which maintains the battery in a fully charged state and also
supplies the inverter, which provides the three phase output via an electronic static switch.
Normally the supply of the reserve line is taken from the AC utility input, but special units, with a separate reserve
input supply, are available. This allows the inputs to be supplied from independent three phase sources.
Provided the reserve supply is within limits, the inverter will match the output frequency with the reserve supply
frequency. The inverter has its own internal crystal control to stabilize the output frequency if the reserve supply
frequency is out of limits. The electronic static switch switches the output from the inverter to the reserve supply,
without interruption, to meet any load current surges, or to supply the load if the battery is discharged during an AC
utility supply failure.
Maintenance and testing can be carried out on the EDP70 PLUS UPS without interrupting the output, by switching
the load from the reserve supply to the maintenance bypass circuit. This work should only be carried out by
Chloride-trained personnel.
1.3 Block diagram