MarelliMotori MEC-100 Manuel De L'utilisateur page 91

The traverse rate of the excitation current is fixed and kept slow by default.
PAY PARTICULAR ATTENTION TO THE MODIFICATION OF THE SETPOINT VALUES. The limit thresholds set
by the MEC-100 Interface System to the setpoint values do not protect against the selection of setpoints which may
be potentially dangerous for the generator and for the devices and/or installations connected to the generator. In all
configuration operations of the MEC-100 Interface System, always check that the new setpoints to be entered are
appropriate to the generator and the devices and/or installations connected to the generator.
Voltage Matching:

Minimum Limit (%): enter the minimum value of the network voltage range within which the voltage matching is enabled;
this limit is expressed in percentage respect to the rated generator voltage (90% to 100%, with minimum increase of 1%).

Maximum Limit (%): enter the minimum value of the network voltage range within which the voltage matching is enabled;
this limit is expressed in percentage respect to the rated generator voltage (100% to 110%, with minimum increase of 1%).
Droop Settings:

Reactive Droop (%): enter in this field the Droop Compensation value (%) for parallel operations (0 to 10%, with minimum
increase of 0.1%).
 Enable voltage setpoint adjustment: click this button to enable the adjustment of the voltage setpoint through UP/DOWN
digital inputs or through 4/20mA analogue inputs with Droop function enabled.
 Enable underexcitation limiter in Droop mode: click this button to enable the underexcitation limiter in Droop mode.
Remember that in this mode the limiter just issues an underexcitation warning through a green LED on the display or the
associated output relay, without actually limiting the excitation current.
5.7.5. Stability (P.I.D. Settings)
In Fig. 5.7.5.a the stability parameters configuration area is shown.
Stability settings:

Custom setting: select this item in order to set individually each one of the following fields.
After performing the setting, click the Save button to store the customised parameter set.

Standard setting: each configuration set contains an entire parameter set, stored by factory or by user.
Voltage Regulation Stability (see Par. 3.11.1):
❑
Proportional Gain: enter in this field the proportional constant value of the regulation loop.
❑
Integral Gain: enter in this field the integrative constant value of the regulation loop.
❑
Derivative Gain: enter in this field the derivative constant value of the regulation loop.
Derivative Adjustments (see Par. 3.11.2):
❑ st
1 Derivative Term - Time: enter in this field the parameter Time for derivative adjustment.
❑ nd
2 Derivative Term - Filter: enter in this field the parameter Filter for derivative adjustment.
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Fig. 5.7.5.a
Stability Parameter Area
MEC-100 – Marelli Motori
91