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DSR regulator, on board of new generators, is already calibrated; in case of loose regulators (ie spare parts) or in case of wiring modi-
fications or adjusting, to guarantee its correct working, it must be accurately set .
Basic settings can be done directly on the regulator by its four trimmers (VOLT - STAB - Hz - AMP), the jumper 50/60 and the Vext
input. More detailed settings or measures can be done exclusively by software using for example the MeccAlte communication interfa-
ce DI1 and the program DSR_Terminal or DSR_Reader.
Vext Input
The Vext input (connector CN1 – terminals 10 and 11) permits analogical remote control of output voltage through a 10Kohm poten-
tiometer with a programmable variation range through parameter 16 with respect to the value set (by default the setting is ±14% star-
ting from revision 10 of the Firmware); if you want to use continuous voltage, it will be effective if it is in the range between 0V and
+2,5V. The input tolerates voltages from -5V to +5V, but for values exceeding the limits of 0V / +2,5V (or in the event of disconnec-
tion), two options are possible: not to take the set point of external input (default configuration) and return to regulation to the voltage
value set with the trimmer (if enabled) or with parameter 19, or keep the minimum (or maximum) value of voltage that can be reached.
The two options can be set with the RAM Voltage CTRL flag in the Configuration menu corresponding to the bit B7 of the configura-
tion word P[10].
NOTE
: The DC voltage generator must be able to sink al least 2mA. In making adjustments it is reccomended not to exceed the no-
minal value of voltage of the alternator beyond ± 10%
50/60 Signal
A jumper is located on the 50/60 input (connector CN1, terminals 12 and 13); it provokes the commutation of the underspeed protec-
tion threshold from 50·(100%-αHz%) to 60·(100%-αHz%), where αHz% represents the position relative to the Hz trimmer.
APO Contact
The acronym APO stands for Active Protection Output: (connector CN1 – terminals 14 and 15) 30V-100mA non-insulated open collec-
tor transistor, normally opened, is closed (with a delay that can be programmed by software from 1 to 15 seconds) when, among all
the alarms, one or more of the active ones can be selected separately by software.
The VOLT trimmer allows adjustment from about 70V to about 140V when using for sensing terminals 4 and 5, or from about 140V to
about 280V when using terminals 6 and 7.
The STAB trimmer adjusts the dynamic response (statism) of the alternator under transient conditions.
The AMP trimmer adjusts the excitation overcurrent protection intervention threshold.
Use the following procedure in order to calibrate the overload protection:
1) Rotate the Hz trimmer entirely in the counter clockwise direction
2) Apply the nominal load to the alternator.
3) Decrease the speed by 10%
4) Rotate the AMP trimmer completely in the counter clockwise direction.
5) After a few seconds, there should be a decrease in the voltage value of the generator and alarm 5 should come on (visible due to
a change in the flashing indicator light) .
6) Under these conditions, rotate the AMP trimmer slowly in the clockwise direction, until the output voltage value is 97% of the no-
minal value: alarm 5 is still activated.
7) Return to the nominal speed; alarm 5 should disappear in a few seconds and the generator voltage should increase to the nomi-
nal value.
8) Re-adjust the trimmer as indicated in the following paragraph.
The Hz trimmer allows to calibrate the threshold of the intervention of the under frequency protection up to -20% with respect to the
nominal speed value set by jumper 50/60 (at 50 Hz the threshold can be calibrated from 40 Hz to 50 Hz, at 60 Hz the threshold can
be calibrated from 48 Hz to 60 Hz).
The intervention of this protection reduce the output generator voltage and, to calibrate it, use the following procedure :
1) Rotate the Hz trimmer entirely in the counter clockwise direction.
2) If the machine has to operate at 60 Hz, ensure that the bridge is inserted between terminals 12 and 13 of the CN1 connector.
3) Bring the generator to 90% of the nominal speed.
4) Slowly turn the "Hz" trimmer, rotating it clockwise until the generator voltage begins to drop and ascertain that the indicator light
simultaneously begins flashing rapidly.
5) By increasing speed, the generator voltage will normalise and the alarm will disappear.
6) Set the speed to the nominal value.
During normal operation and a duty cycle of 50% an indicator light mounted on the board flashes every 2 seconds; it flashes different-
ly in the event of intervention or alarm, as indicated in figure 1.
NOTE: Notwithstanding DSR maintains the voltage regulation, it goes in shutdown mode if the frequency decreases under 20Hz.
The reset needs the Gen-Set switching off
.
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ATO/E 28 Manual - March 2018 rev. 00
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