Protection Systems - Eaton 8kW Manual Del Propietário

Operation
3.6

PROTECTION SYSTEMS

3.6.1 ALARMS
Highest Priority (Latching) Displayed on the control panel and the
external red LED. They must be cleared before the alarm message
goes away. The alarm log records each occurrence (see Appendix
- "Menu System").
Low Oil Pressure (Shutdown Alarm)
A five (5) second delay on start-up and seven (7) second delay
once the engine is running.
This switch (Figure 3.5) has normally closed contacts that are
held open by engine oil pressure during operation. Should the oil
pressure drop below the five (5) PSI range, switch contacts close
and the engine shuts down. The unit should not be restarted until
oil level is verified.
High Engine Temperature (Shutdown Alarm – Auto Reset)
A 10 second delay on start-up and one (1) second delay before
shutdown. Auto reset when the condition clears and restart the
engine if a valid start signal is still present.
This switch's contacts (Figure 3.5) close if the temperature should
exceed approximately 144° C (293° F), initiating an engine shut-
down. Once the oil temperature drops to a safe level the switch's
contacts open again.
Over Crank (Shutdown Alarm)
This occurs if the engine has not started within the specified crank
cycle. (See "Cranking" section.)
The oil drain hose may be routed in the opposite direction as
shown in figure.
Figure 3.5 – Low Oil Pressure and
High Temperature Switches
Low Oil Switch
Oil Filter
Oil
Drain
Hose
20
NOTE:
High Temp Switch
Over Speed (Shutdown Alarm)
4320 RPM for three (3) seconds or 4500 RPM immediately. This
feature protects the generator from damage by shutting it down
if it happens to run faster than the preset limit. This protection
also prevents the generator from supplying an output that could
potentially damage appliances connected to the generator circuit.
Contact the nearest Dealer if this failure occurs.
RPM Sense Loss (Shutdown Alarm)
During cranking, if the Control Board does not see a valid RPM
signal within three (3) seconds, it will shut down and lock out on
RPM sense loss. While engine is running, if RPM signal is lost for
one (1) second the Control Board will shut the engine down, wait
15 seconds, then re-crank the engine. If no RPM signal is detected
within the first three (3) seconds of cranking, the Control Board
will shut the engine down and latch out on RPM sensor loss. If the
RPM signal is detected, the engine will start and run normally. If
the RPM signal is subsequently lost again, the Control Board will
try one more re-crank attempt before latching out and displaying
the RPM sensor failure message.
Under-frequency (Shutdown Alarm)
After starting, if the generator stays under frequency for more
than 30 seconds it will shut down. The under-frequency setting is
50 Hz.
Internal Fault (Shutdown Alarm)
This alarm cannot be cleared, call service dealer.
Undervoltage (Shutdown Alarm)
If the generator voltage falls below 60% of nominal for more than
five (5) seconds, it shuts down.
Overvoltage (Shutdown Alarm)
If the generator voltage rises above 110% of rating for greater than
three (3) seconds, an alarm will be issued and the unit will shut
down.
If the generator voltage rises above 130% of rating for greater than
0.2 seconds, an alarm will be issued and the unit will shut down.
Clear Alarm
Clear the alarm by setting the AUTO/OFF/MANUAL switch to the
OFF position. Press the ENTER key to unlatch any active fault and
clear the corresponding alarm message.
3.6.2 COMMON ALARM RELAY
The common alarm relay will be activated if there is a shutdown
alarm. It will not activate on warnings or indicate that the AUTO/
OFF/MANUAL switch is in the OFF position. The OFF position will
clear the alarms and the relay. The relay will not be used to indicate
a generator is not activated.
The common alarm terminals are wired to a set of potential-free
(dry) contacts on the Nexus contoller board. These Normally Open
(N.O.) contacts close when an alarm condition occurs and are
used to activate a remote signaling device. The circuit is rated for
a maximum of 130mA at 24 VDC.