Auto Protection - Smartgen HGM501 User Manual

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 hours,
alarm shutdown will be initiated;
If the set value is exceeded by more than 10%, the gen-set will be shut down
immediately (approximately 2 seconds);
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, low oil
pressure will lead to automatic disconnection of oil circuit;
5 High engine temperature protection
If engine temperature exceeds 108℃, LED window starts flashing; after 7
second 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
HGM501 Genset Controller
HGM501Genset Controller
Version V1.0 2012-07-10 Page 8 of 15