Principle of Operation:
PLT energy saving devices is designed for energy saving
for all type of gas discharge lamps (fluorescent, HID
sodium and mercury).
ESD will supply high voltage to lights when turn on.
After 5 minutes warm up period, ESD will switch to energy
saving mode. Energy saving level will depend on pre-program
timing. ESD can switch to either no save, level 1 or
level 2 energy saving mode. Multi level and multi duration
energy saving mode is done by pre-programming the ESD
operation timing. ESD real time clock uses crystal controlled,
which can be programmed to operate in no save, saving
level 1 and saving level 2 at any 24 hour period.
ESD unit monitor grid supply voltage and load current.
When it detects the load current increase of more than
1.5A and within the maximum load current limit, ESD will
switch to warm up mode before activating saving mode.
ESD will
switch to higher saving level automatically
when supply voltage exceeds 240 volts. Lamp test function
is included for routine lamp replacement. When lamp
test switch is depressed, energy saver will only switch
to dimming mode after 40 minutes checking period. ESD unit has an internal monitoring circuit. The monitoring
results are display on front panel LED status lights.
The status lights indicate the working condition of ESD.
ESD will switch to by -pass mode when fault occur in
ESD, e.g. ESD is over loaded (load current higher than
ESD capacity), grid supply voltage too low or ESD internal
temperature too high. ESD is equipped with a manual isolation
and by-pass switch. |
