MarelliMotori MEC-100 Manual De Instrucciones página 63

3.5.3. UP (C3 Contact)
Active operational setpoint increasing contact (normally open, momentary pushbutton logic):

AVR Mode: increases the generator voltage setpoint.

PF Mode: if the power factor setpoint is of inductive type, decreases the power factor; if the setpoint is of capacitive type,
increases the power factor.

VAR Mode: increases the reactive power setpoint.

FCR Mode: increases the excitation current setpoint.
The setpoint increase is strictly related to the range established for the setpoint (see Par. 5.7.3) and the variation speed (or
traverse rate, see Par. 5.7.4).
It is assumed that the inductive reactive power is of positive sign and the capacitive reactive power of negative sign.
In parallel with the network (PF Mode or VAR Mode active) the UP contact increases the reactive power value so
as to obtain the desired power factor or reactive power setpoint depending on the selected regulation Mode.
WARNING: ONLY FOR MEC-100 P.N. M71FA300A: THE UP CONTACT CAN NOT BE USED FOR ENDLESS
REPETITIVE PURPOSES. The UP contact can only perform a current setpoint change for spot operations; the
endless repetitive use of the contact is forbidden. If a continuous setpoint matching is required, the auxiliary
analogue inputs E1-E2-M must always be used (see Par. 3.4.4).
3.5.4. DOWN (C4 Contact)
Active operational setpoint decreasing contact (normally open, momentary pushbutton logic):

AVR Mode: decreases the generator voltage setpoint.

PF Mode: if the power factor setpoint is of inductive type, increases the power factor; if the setpoint is of capacitive type,
decreases the power factor.

VAR Mode: decreases the reactive power setpoint.

FCR Mode: decreases the excitation current setpoint.
The setpoint decrease is strictly related to the range established for the setpoint (see Par. 5.7.3) and the variation speed
(traverse rate, see Par. 5.7.4).
It is assumed that the inductive reactive power is of positive sign and the capacitive reactive power of negative sign.
In parallel with the network (PF Mode or VAR Mode active) the DOWN contact decreases the reactive power value
so as to obtain the desired power factor or reactive power setpoint depending on the selected regulation Mode.
WARNING: ONLY FOR MEC-100 P.N. M71FA300A: THE DOWN CONTACT CAN NOT BE USED FOR
ENDLESS REPETITIVE PURPOSES. The DOWN contact can only perform a current setpoint change for spot
operations; the endless repetitive use of the contact is forbidden. If a continuous setpoint matching is required, the
auxiliary analogue inputs E1-E2-M must always be used (Par. 3.4.4).
3.5.5. PAR (C5 Contact)
Generators parallel enabling contact (normally open, switch logic): this input activates the Droop mode for paralleling one or
more generators (for the Droop function see Par. 3.9). When this contact is closed the excitation limiters, provided for the
operating mode in parallel, are enabled and the voltage matching function is disabled (see Par. 3.5.7). When the PAR contact is
closed, the LED corresponding to the Reactive Droop Compensation item in the system status window in System Monitoring
becomes green.
3.5.6. PF/VAR (C6 Contact)
PF/VAR Mode enabling contact (normally open, switch logic): this input activates the PF (Power Factor) or VAR (Reactive
Power) regulation Mode (depending on the previously selected Mode, see Par. 5.7.1), for the mains parallel operations. When
this contact is closed the excitation limiters, provided for the operating mode in parallel, are enabled and the voltage matching
function is disabled (see Par. 3.5.7). When the PF/VAR contact is closed, the LED corresponding to the Parallel with Line item
in the system status window in System Monitoring becomes green.
3.5.7. VMATCH (C7 Contact)
Voltage matching enabling contact (normally open, switch logic): this input enables the voltage matching function from the MEC-
100; if the network voltage value measured by the MEC-100 is included in the range of set values (values referred to the
generator rated voltage, see Par. 5.7.4), the generator voltage setpoint is automatically modified from the pre-established value
to the network voltage value in a fixed time interval of 10-15 seconds approximately.
When the PAR or the PF/VAR contact is closed the voltage matching function is disabled and remains disabled until both the
PAR and PF/VAR contacts are opened. When the VMATCH contact is closed (and both the PAR and PF/VAR contacts are
disabled), the LED corresponding to the Voltage Matching item in the system status window in System Monitoring becomes
green.
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MEC-100
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