5.6 SECOND ZERO
DESCRIPTION:
The CEC7 control unit makes it possible to avoid the zero in the power supply
upon the return of the network via the Second Zero (SZ7) expansion. This
function is only enabled if the control unit of the genset is from the CEM7 family
and has the Second Zero (SZ7) module installed. With the second zero function
enabled, the activation process of genset contactors in automatic mode upon
the return of the network signal is performed after synchronizing the phase,
frequency and amplitude of the network and genset electrical signals. Upon
activation of the genset contactor, the control unit performs a controlled transfer
of the load taken from the network to the genset prior to opening the network
contactor.
PROGRAMMING:
Enabling the second zero function is performed by programming a control unit
parameter (Synchronization table, parameter 1 values 1 and 2) if the Second
Zero (SZ7) device is detected in the installation.
5.7 HEATER
DESCRIPTION
The screen of the control unit has a heater which allows it to work at low temper-
atures. The control unit maintains a minimum screen temperature by means of a
heater, thereby ensuring that on-screen information can be refreshed.
PROGRAMMING
Enabling the reserve screen heater function is performed by programming a con-
trol unit parameter (Screen table, parameter 3, value 1). The minimum screen
temperature ensured by the screen heater is programmed through a control unit
parameter (Screen table, parameter 11).
5.4 ENABLING THE GENSET CONTACTOR
DESCRIPTION:
This function makes it possible to assign to a programmable input of the CEC7
control unit the ability to stop the activation of the genset contactor. In this way,
once the control unit detects the start condition of the generator set and
validates that the genset electrical signal is stable, the CEC7 control unit waits
to activate the genset contactor until it detects an active signal at the
programmable input assigned to this function.
PROGRAMMING:
The function enabling the genset contactor is performed by assigning a
programmable input to that function (Settings table, parameter 8).
5.5 GENSET IN RESERVE
DESCRIPTION:
The genset in reserve function allows the operation of several generator sets in
the same installation. With this function, the CEC7 control unit selects the start-
up of the generator set with the fewest hours of engine operation.
PROGRAMMING:
Enabling the genset in reserve function is performed by programming a control
unit parameter (Settings table, parameter 31, values 4 to 7). The control units of
the CEM7 genset must also have the genset in reserve function enabled (Settings
table, parameter 31, values 4 to 7).
OPERATION | PAGE 14
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