| Features |
|
Microprocessor
controlled |
|
Phased
controlled rectifier for reliability, ease of user and scalability |
|
Constant
current/Voltage charger |
|
Temperature
compensated float charge voltage |
|
Sophisticated
operation with battery life and reliability the main design objectives |
|
Equalises
the Voltage across the battery connector before closing |
|
Low
battery disconnect using a magnetically latched connector |
|
Volt-free
changeover contacts to drive remote common alarm |
|
Two
button operation for system shutdown |
|
Sophisticated
high-speed mains failure detection |
|
Comprehensive
monitoring and display |
|
Audible
alarm with manual reset |
|
Dual
independent power supplies with monitoring |
|
Two
button operation for test, initiated from the front panel |
|
Rugged
and reliable inverter |
| Overview |
SPEL
static inverter systems are designed to supply power to an external lighting
circuit. When the input mains supply is within specification, it is fed to
the lighting circuit through the normally open contacts of the changeover
contactor. If the input mains fails or goes outside preset parameters, the
system automatically goes into emergency mode and the changeover operates,
starting the inverter and supplies the lighting circuit with power through
the normally closed contacts. The inverter derives it's power from the battery.
When the mains supply returns to normal, the system automatically switches
the inverter off and changes back to the normal mode supplying the load with
mains power and recharging batteries. |
Powersine
systems are microprocessor controlled and have many monitoring and display
functions. The display is via a front panel mounted PCB using LED's to indicate
the status of the system. Alarm conditions are accompanied by an audible alarm
with a manual reset. Larger systems have a digital meter reading the battery
Voltage and the charge/discharge current. System shut-down can be operated
via the front panel |
Powersine
systems are housed within sturdy cabinets fabricated from epoxy powder coated
1.6mm sheet steel. Access is gained via a lockable hinged door at the front
of the cabinet entries located in the form of an un-drilled gland plate at
the top of the cabinet |
| |
| Mode of Operation |
Under
normal operation the incoming mains supply is fed through MCB's or fuses.
One feeds to the normally open contacts of the changeover contactor with the
other to the charger transformer. During normal operation the contactor coil
is energised by the mains supply through normally closed relay contacts on
the control board. The control overrides the supply to the contactor coil
to prevent chatter and to control the changeover to minimise arching. |
| |
When
the control board is powered up by the charger, the system starts and after
equalising the Voltage across the battery contactor the coil is pulsed, closing
the contacts and connecting the battery. The control board derives it's power
from a winding on the charger transformer and/or a dual DC to DC converter
running from the battery supply. The output of each of the DC to DC converters
is monitored by the control board which gives an audible and visual alarm
if a failure occurs, providing a very reliable power supply for the system
control. The control board shuts the charger down every four hours for twenty
seconds to check that the battery connections, contactor and fuses are all
operating correctly. |
| |
When
the mains supply fails or operates outside of the preset specification, the
system will enter emergency mode. The changeover contactor operates to it's
normally closed position, the inverter will start and the load is supplied
with AC power derived from the batteries. When the mains supply regains healthy
status, the Powersine system returns to
its normal mode of supplying the load with AC power from the input supply.
During this process, the charger is energised and recharges the battery. |
| |
| Battery Charger |
The
Powersine 8/16 bit micro controller uses
a sophisticated program and controls the battery charger and monitors the
many parameters. The charger starts into a discharged battery by supplying
current up to the preset maximum limit. As the battery becomes charged, the
stage one Voltage is reached and the current starts to reduce. When the current
reduces to a third of it's maximum, the charger switches to float voltage.
As the electrochemical activity in the battery increases with rising temperatures
and decreases when the temperature falls, the float charge Voltage is temperature
compensated. This protects the battery from over or under charging but ensures
the battery is 100% charged for emergency conditions and therefore substantially
increases the service life of the battery. |
| |
| Shutdown Procedure |
For
safety reasons, the shutdown of the Powersine
system is conducted via the front panel. After switching the mains supply
off, two red-shutdown buttons located on the front display panel are pressed
simultaneously and held down for two seconds. The battery contactor will operate
and the output will shutdown. The mains supply must be switched back on to
restart the system. |
| |
| Air Inlet/Outlet |
It
is important that the Powersine system
is positioned so that there is a minimum clearance of 100mm around the air
inlet and outlet to prevent the system from overheating, which could lead
to a system malfunction. |
| |
| Protection |
| Sophisticated electronic
control circuit breakers or fuses are used to protect the
Powersine system. |
| |
| Maintenance |
The
Powersine static inverter system should
be maintained in accordance with applicable National and International standards.
The systems should be isolated from both of the incoming power supplies before
any maintenance work is carried out. |
