Himoinsa CEM7 - Page 19

OPERATION | PAGE 19
4.9 MOTORPUMP MODE
DESCRIPTION
The motorpump mode congures the CEM 7 control unit to display only engine
measurements, hiding generator set voltage measurements. This conguration
must only be used for control units installed in motorpump type systems where
there is no electrical power generation. They must also disable all alarms
associated with the electrical measurements of the control unit and the detection
of the engine start up via generator voltage.
PROGRAMMING:
Enabling the motorpump mode is carried out through programming of a control
unit parameter (Screen table, parameter 6).
4.10 GENSET IN RESERVE
DESCRIPTION
The genset in reserve function allows the operation of several generator sets in
the same installation. In order to balance out the hours that all the gensets are
operational, this function lets the control units specify which generator set should
start up. They select the genset whose engine has been running for the least
length of time. This running mode only affects the control unit’s automatic
working mode. For safety reasons, a generator set can not start-up if any other
genset is detected to be starting-up with the functionality of the genset in reserve
enabled.
It is possible to combine the functionality of the genset in reserve with the
programmed weekly schedules in order to establish priorities during specic
periods of time. To do this, you have to programme time slots in one of the
gensets (the master genset) in the facility, for:
• Forced start-up. During this period, the master genset will have priority
start-up and the facility’s genset in reserve will stop running, once the
master genset has started running.
• Start-up inhibited. During this period, the master genset will not have
priority and therefore, the genset in reserve will start up. Once the
genset in reserve has started running, the master genset will stop.
PROGRAMMING
The control unit will activate the output, disconnecting part of the load, when gen-
set power consumption is detected which is greater than the limit set by the pa-
rameter (Threshold table, parameter 34). The control unit will keep the output
active until the power supplied by the genset falls below a programmed parame-
ter limit (Thresholds table, parameter 35). Both in the activation and deactivation
of the output, the conditions must be validated for a programmable time (Times
table, parameter 27). The output is assigned to perform the load demand func-
tion via the control unit conguration (Settings table, parameters 1 to 4, 24, 41
to 45 value 24).
4.8 ELECTRONIC PROTECTION
DESCRIPTION
The electronic protection is a feature that permits a control unit output to be
activated in the event of an overload and short circuit alarm. This function allows
the genset's main circuit breaker to be disabled via the trip coil. While any of
these alarms that causes the engine to stop (immediate or cooling) remains
active or pending notication, the output assigned to electronic protection
remains active.
PROGRAMMING
The possible outputs that can be assigned to this function are:
• The SC relay is assigned by default to this function. Furthermore, the
SC relay is also activated when any alarm is generated which causes
the engine to stop.
• The BT relay of the measurements module (Regulations table,
parameter 4).
• Any of the programmable outputs of the measurements module
(Settings table, parameters 1 to 4, 24, 41 to 45).