Himoinsa CEM7 User Manual

CEA7 CONTROL UNIT ALARMS | PAGE 36
UNDER SPEED
The CEA7 control unit's under speed alarm is associated with the measurement
of the engine ywheel ring gear's rotation speed or through the J1939 channel of
communication with the engine (only J1939 option). This measurement is
performed via the pickup input of the measurements module. Alarm management
is limited to the fact that the parameter for the number of teeth on the ywheel
ring gear (Thresholds table, parameter 24) is not zero or that the engine control
electronics transmits the speed via the J1939 bus. Detection of the under speed
alarm is set by default (Alarms table, parameter 25) to be activated under
nominal engine conditions.
An under speed alarm can be associated a debounce time (Alarms table,
parameter 26) during which the engine speed must be kept below the minimum
threshold set (Thresholds table, parameter 12). The under speed alarm is set by
default (Alarms table, parameter 27) to always perform a stop of the engine with
cooling.
OVERLOAD
The CEA7 control unit's overload alarm is associated with the measurement of
the RMS current in any phase which exceeds the maximum overload limit
programmed (Thresholds table, parameter 7) but which is lower than the
maximum short circuit limit (Thresholds table, parameter 8).
The phases which are evaluated for the detection of the short circuit alarm are
selected depending on the conguration of the installation phases (Thresholds
table, parameter 1):
• In a single phase conguration phase 1 is tested.
• In a two-phase conguration phases 1 and 2 are tested.
• In a two-phase selector conguration phases 1 and 3 are tested.
• In a three-phase conguration with neutral or three-phase without
neutral phases 1, 2 and 3 are tested.
Detection of the overload alarm is set by default (Alarms table, parameter 28) to
be activated under nominal engine conditions. An overload alarm can be
associated a debounce time (Alarms table, parameter 29) during which the
current measured during any of the phases must be kept above the maximum
threshold limit set (Thresholds table, parameter 7). The overload alarm is set by
default (Alarms table, parameter 30) to perform a stop of the engine with cooling.
FUEL RESERVE
The CEA7 control unit's fuel reserve alarm is associated with the digital input
specically provided for the fuel reserve (RC). The status of this input must be
validated during a time interval (Times table, parameter 15) for stabilisation
(debounce) before generating the fuel reserve alarm.
It can be congured as normally open or normally closed (Regulations table,
parameter 5).
Detection of the fuel reserve alarm is set by default (Alarms table, parameter 19)
to be activated: Always.
A fuel reserve alarm can be associated with a time (Alarms table, parameter 20)
to delay the moment at which the alarm begins to conrm the alarm conditions.
The fuel reserve alarm is set by default (Alarms table, parameter 21) to perform
no action (warning).
User intervention is not required to reset the generator set after a low fuel alarm
has been generated (auto reportable alarm).
OVERSPEEDING
The CEA7 control unit's overspeeding alarm is associated with the measurement
of the engine ywheel ring gear's rotation speed or through the J1939 channel of
communication with the engine (only J1939 option). This measurement is
performed via the pickup input of the measurements module. Alarm management
is limited to the fact that the parameter for the number of teeth on the ywheel
ring gear (Thresholds table, parameter 24) is not zero or that the engine control
electronics transmits the speed via the J1939 bus.
Detection of the overspeeding alarm is set by default (Alarms table, parameter
22) to be activated under nominal engine conditions.
An overspeeding alarm can be associated a debounce time (Alarms table,
parameter 23) during which the engine speed must be kept above the maximum
rotation speed limit (Thresholds table, parameter 11). The overspeeding alarm is
set by default (Alarms table, parameter 24) to always perform an immediate stop
of the engine.

Himoinsa CEM7 Specifications

General

Brand	Himoinsa
Model	CEM7
Category	Control Unit
Language	English