HGM7220N/HGM7220S GENSET CONTROLLER USER MANUAL
HGM7220N/HGM7220S Genset Controller 2019-02-28 Version 1.0 Page 11 of 60
4.3
AUTO START/STOP OPERATION
4.3.1. ILLUSTRATION
Press
and the indicator beside is illuminated, meaning genset is in Auto Start mode.
4.3.2. AUTO START SEQUENCE
a) HGM7220N/HGM7220S Start Conditions:
Mains Enable:
When mains is abnormal (over and under voltage, over and under frequency, loss of
phase and inverse phase), genset enters
“mains abnormal delay” and LCD displays countdown time.
When mains abnormal delay is ove
r, it enters “start delay”. Or when remote start (load on) input is active,
it enters
“start delay”.
Mains Disable:
When remote start (load on) input is active, genset enters
“start delay”.
b)
“start delay” countdown is shown on LCD.
c) When
start
delay
is
over,
preheating
relay
outputs
(if
configured), “Pre-heat
Delay
XX s” is shown on LCD.
d) When preheating delay is over, fuel relay outputs for 1s. Then start relay outputs; if engine cranking
fails during “cranking time”, the fuel relay and start relay are deactivated and enter “crank rest time”
waiting for next crank.
e) If engine crank fails within setting times, controller will initiate
“failed to start” shutdown signal and
“failed to start” message appears on LCD display at the same time.
f)
In case of successful cranking
, “safety on time” starts. During this period, low oil pressure, high water
temperature, under speed, and charge failure alarms are disabled. As soon as
“safety on delay” is
over, “start idle delay” is initiated (if configured).
g)
During “start idle delay” period, under speed, under frequency, under voltage alarms are inhibited.
When this delay is over, “warming up delay” starts (if configured).
h) In case mains is abnormal and HGM7220N remote start (on-load) input is active, w
hen “warming up
de
lay” is over, if generator status is normal, the indicator will be illuminated; if voltage and frequency
has reached to on-load requirements, the closing relay will be energized, generator will accept load,
generator power indicator will be lit on, and generator will enter Normal Running status; if voltage and
frequency are abnormal, the controller will initiate shutdown alarm (shutdown alarm will be displayed
on LCD alarm page).
i)
In case HGM7220S remote start (on-load) input is active, when
“warming up delay” is over, if
generator status is normal then the generator status indicator shall be illuminated. Until genset and
mains satisfy the synchronization conditions, the controller shall issue close signal and when the
controller detects the close feedback signal, it shall issue immediately the open signal, and genset is
on-load.
NOTE:
when remote start (off-load) signal input is active, the auto start sequence is the same as above except
item h), generator closing relay will not output, and genset is off-load.
4.3.3. AUTO STOP SEQUENCE
a)
In case HGM7220N/7220S genset is at normal running, if mains recovers normal, genset shall enter
mains voltage “normal delay”. As soon as mains normal status is confirmed, mains status indicator
shall be illuminated and “stop delay” starts; Or if remote start input is not active, “stop delay” starts.
b)
As soon as
“stop delay” is over,
