HAT880 SERIES DUAL POWER BYPASS CONTROLLER USER MANUAL
HAT880 Series Dual Power Bypass Controller 2019-07-11 Version1.1 Page 43 of 49
14
NEL CONTROL
14.1
ILLUSTRATION
Non-essential load ---- NEL for short, refers to load can be ramped off in prior when genset power is
out of shortage.
The controller can control the NEL1, NEL2 and NEL3 to trip separately. The order of the essentiality
is: NEL3 > NEL2 > NEL1
14.2
AUTO OPERATION
NEL Trip Enabled
: If the genset power has exceeded the NEL trip value, after the trip delay, NEL1
will trip the earliest, and then is NEL2, NEL3.;
NEL Auto Reconnection Enabled
: If the genset power has fallen below the auto reconnection set
value, after the auto reconnection delay, NEL3 will be reconnected the earliest, and next is NEL2, NEL1.
Fig. 7 - NEL Control Sequence Drawing
14.3
MANUAL OPERATION
If NEL manual trip input is active (earthed failing edge is active), NEL1 will trip without delay; If NEL
manual trip input is active again, NEL2 will trip; If NEL manual trip input is active for the third time, NEL3
will trip. At this time the controller does not detect whether the genset power has exceeded the NEL trip
value or not.
If NEL manual reconnection input is active (earthed failing edge is active), NEL3 will be reconnected
without delay; If NEL manual reconnection input is active again, NEL2 will be reconnected; If NEL
manual reconnection input is active for the third time, NEL1 will be reconnected. At this time the
controller detects the genset power: if the genset power has fallen below the NEL reconnection value,
then the input is active; if it doesn’t, the input is deactivated.
NOTE6:
When auto trip and auto reconnection are enabled, manual trip is still active
.
