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1.3.
FRONT PANEL
The front panel gathers the real time information of the UNIT and displays the data clearly. It also provides
switches for controlling and setting the UNIT. Each part of the panel is explained below:
A. LCD display- Real time status, data, and historical events are displayed on the LCD. The UNIT
parameters, real time clock, inverter, buzzer also can be set through this LCD. The LCD is back lit by
LEDs to provide a clear display, In order to lengthen the LED's life time, they will be automatically shut
off 3 minutes after no key is activated, and will light up again when one of the keys are pushed.
B. STATUS LEDs- 25 LEDs representing all of the important information of the UNIT will provide current
information to the user. Therefore these LEDs are especially important when abnormal conditions
occur. The 25 status indicators are:
1. INVERTER ON – the inverter is running.
2. LOAD CONNECTED – the inverter is connected to the output terminals.
3. SHORT CIRCUIT – the output is in a short circuit status.
4. FUSE/OVER TEMP SD – the inverter is shutdown due to either a blown fuse or an over
temperature condition.
5. INVERTER FAILURE SD – the inverter is shutdown due to low inverter output voltage.
6. HIGH DC SHUTDOWN – the inverter is shutdown due to a high DC bus voltage condition when
the inverter is running.
7. OVERLOAD SHUTDOWN – the inverter has shutdown due to overloading the inverter for a period
exceeding the max overload specification. The inverter will restart after 7 seconds.
8. 70% LOAD -- the load connected to the output is over 70% of the UNIT rating.
9. 110% LOAD -- the load connected to the output is over 110% of the UNIT rating.
10. 125% LOAD -- the load connected to the output is over 125% of the UNIT rating.
11. 150% LOAD -- the load connected to the output is over 150% of the UNIT rating.
12. DC LOW – the internal DC bus voltage is less than minimum specifications.
13. DC LOW SHUTDOWN – the inverter has shutdown because the internal DC bus voltage is less
than allowable specifications.
14. RECTIFIER AC FAIL URE -- the AC voltage to the rectifier is out of range.
15. ROTATION ERROR -- the rectifier AC phase rotation sequence is incorrect. Any two phases of
the input AC power must be reversed for the rectifier to function.
16. RECTIFIER SHUTDOWN -- the rectifier is shutdown due to high rectified DC voltage (over
445VDC). The UNIT will automatically restart 30 seconds after the abnormality has been cleared.
17. HIGH DC -- the rectified DC voltage is over 43OVDC and the bus voltage will be limited at this
voltage.
18. EMERGENCY STOP – optional -- the inverter is shutdown because the emergency stop switch
was pushed.
C. WARNING LEDs: When abnormal conditions occur, these LEDs will light to warn the user of the
cause of the faulty condition. Therefore all of these should be extinguished under normal conditions.
These LEDs are:
1. RECT AC FAIL -- AC voltage is out of range, there is a phase rotation error, or the rectifier has
shutdown.
2. FUSE / TEMP -- the inverter fuse is blown or the UNIT is over temperature.
3. OVERLOAD -- the output is overloaded by over 110%, 125% or150%.
4. HIGH DC -- the LED will light as long as the DC voltage to the inverter is over the 430 VDC limit.
5. DC LOW – the internal DC bus voltage is less than minimum specifications.
6. DC LOW STOP -- the inverter has shutdown because the internal DC bus voltage is less than
allowable specifications.
7. FAULT -- the inverter has shutdown due to an abnormal condition such as overload, short circuit,
high DC voltage, fuse, over temperature, bypass breaker, or an emergency stop.
Since these LEDs are located behind the transparent window, the user can see them clearly without
opening the door.
5
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