8. ALARM AND PROTECTION
8.1. Overload Protection
When load is <120%, the voltage regulator won't give alarm and protection.
Once the load is over 120%, the buzzer will beep once per 2 seconds, in the same time,
the countdown time for output cutoff will be shown in the display. Once the
countdown is finished, the output will be cut off by contactor, in the same time, symbol
"F" will be shown in the display, and the buzzer will beep once per second.
Load Rate
Countdown Time
>120%
180s
>150%
30s
>200%
10s
>300%
5s
If overload is eliminated within 15 minutes, the output will be automatically restored.
Otherwise, the user must restart the voltage regulator.
8.2. Under Voltage Protection
Once the output voltage is below the lower limit, symbol "L" will be shown in the display
and keep flashing, in the same time, the buzzer will beep once per 2 seconds. After 20
seconds, the output will be cut off by contactor, and the buzzer will beep once per
second .
When the input voltage increases to normal range, the output will be automatically
restored.
8.3. Over Voltage Protection
Once the output voltage is over the upper limit, symbol "H" will be shown in the display
and keep flashing, in the same time, the buzzer will beep once per 2 seconds. After 20
seconds, the output will be cut off by contactor, and the buzzer will beep once per
second .
When the input voltage decreases to normal range, the output will be automatically
restored.
8.4. Over Temperature Protection
Once the temperature of transformer windings is over the limit, the output will be cut off
immediately by contactor, symbol "C" will be shown in the display and keep flashing,
in
the same time, the buzzer will beep once per second
When the temperature decreases to normal range, the output will be automatically
restored.
8.5. Input Wrong Phase Sequence Protection
The voltage regulator can't be switched on if the phase sequence is wrong, symbol "P"
will be shown in the display and keep flashing, in the same time, the buzzer will beep
once per second.
8.6. Short Circuit Protection
The
INPUT AIR BREAKER
will trip off to cut off the input if short circuit happens.
8.7. Surge Protection (Optional)
The additional SPD (Surge Protection Device) will protect the voltage regulator and
connected loads from being damaged by surge, spike or thunder strike.
Check periodically if the SPD is void.
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