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5.
AUTO PROTECTION
In auto protection mode, except for low oil pressure protection, all the other protections
(voltage, frequency, overload, temperature) are active.
1)
Voltage protection
When the limits of rated voltage are exceeded by ±10%, Voltage LED starts flashing; after
7 seconds delay in case of under voltage or 3 seconds delay in case of over voltage,
alarm shutdown is initiated. After that voltage LED continues to flash and shows
pre-alarm value.
2)
Frequency protection
50Hz：(45~55)Hz
60Hz：(55~65)Hz
When the set value is exceeded, frequency LED starts flashing; after 7 seconds delay in
case of under frequency and 3 seconds delay in case of over frequency, alarm shutdown
is initiated. After that frequency LED continues to flash and shows pre-alarm value.
3)
Overload protection
If the set value is exceeded by 5% or less, alarm will not be initiated;
If the set value is exceeded by more than 5%, power LED will start flashing;
If the set value is exceeded by 5%-7.5% and continuous for more than 3 hours, then alarm
shutdown will be initiated;
If the set value is exceeded by 7.5%-10% and continues for more than 1 hour, alarm
shutdown will be initiated;
If the set value is exceeded by more than 10%, and continues for more than pre-set over
power delay value, alarm shutdown will be initiated (defult: 30s);
After alarm shutdown is initiated power LED continues to flash and shows pre-alarm
value.
4)
Low oil pressure protection
Irrespective of whether auto protection mode is enabled or not, genset will shutdown if
low oil pressure occurs and last for more than 2s.
5)
High engine temperature protection
If engine temperature exceeds pre-set high temperature threshold, LED window starts
flashing; after 7 seconds delay, protection begins; LED window continues to flash and
shows pre-protection value (for air-cooled engine);
6)
High generator temperature protection
When generator temperature exceeds 95℃, LED window starts flashing; after 7 second
delay, protection begins; LED window continues to flash and shows pre-protection value;
7)
Battery voltage protection
Battery voltage protection is enabled irrespective of whether auto protection mode is
enabled or not and whether gen-set is running. If battery voltage value is lower than 8V or
higher than 16.5V, Nixie tube or LED display starts flashing, but shutdown protection is
not initiated.
NOTE: During Safety On delay, protection is disabled; after Safety On Delay, when voltage, frequency,
overload, high temperature protection is initiated, fuel output deactivates.
HGM501 Genset Controller User Manual
Page 9 of 17
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