HAT700 SERIES ATS CONTROLLER USER MANUAL
HAT700 Series ATS Controller 2018-12-13 Version 1.5 Page 40 of 51
13 LOAD SHEDDING
Non-essential load ---- NEL for short.
The controller can control the NEL1, NEL2 and NEL3 to trip separately. The order of the essentiality is:
NEL3 > NEL2 > NEL1
Auto trip
：
When NEL auto trip is enabled:
If the genset power has exceed the NEL trip value, after the trip delay, NEL1 will trip the earliest, and
then is NEL2
，
NEL3
；
When NEL auto reconnection is enabled:
If the genset power has fallen below the auto reconnection set value, after the auto reconnection delay,
NEL3 will reconnection the earliest, and then is NEL2
，
NEL1
；
Manual Trip
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 the third time, NEL3 will
trip. During this process, the controller do not detect if the genset power has exceed the NEL trip value or
not.
If NEL manual reconnection input is active (earthed failing edge is active), NEL3 will reconnect without
delay; If NEL manual reconnection input is active again, NEL2 will reconnect; If NEL manual
reconnection input is active the third time, NEL1 will reconnect. During this process, 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.
Note: When auto trip and auto reconnection are enabled, manual trip is still active.
