Mecc Alte DER2, Technical Manual

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DER2 digital regulator instruction manual - rev. 02 - pag. 20
Bit Value Function Default
B0 1 Not used 0
B1 2 Periodical reference variation 0
B2 4 Automatic voltage offset compensation
(1)
1
B3 8 Not used 0
B4 16 Enable hardware jumper 50/60Hz 1
B5 32 Inversion APO 1
B6 64 Force three-phase sensing 0
B7 128 External location reference L[49]
(2)
and activation of saturation in the event of overflow
(3)
0
B8 256 Enable VOLT TRIMMER 1
B9 512 Enable STAB TRIMMER 1
B10 1024 Enable Hz TRIMMER 1
B11 2048 Enable AMP TRIMMER 1
B12 4096 Enable external analogical input 1
B13 8192 Enable external DAC 0
B14 16384 60 Hz setting in the event of disabling of the 50/50 Hz hardware jumper 0
B15 32768 Reserved 0
TABLE 7 : BIT FUNCTION OF THE CONFIGURATION WORD (PARAMETER P[10] )
3. RAM location reference, activation of saturation in analogical remote control
The RAM Voltage CTRL Flag (corresponding to bit 7 of the P[10] configuration word) performs two
functions:
1. If the Pext hardware input is enabled (Flat Ext. Input corresponding to bit 12 of the P[10] configuration
word), as previously described, the RAM Voltage CTRL Flag activates saturation of output voltage
when the analogical control voltage reaches the limit foreseen for input, to which it is applied (see Para.
8 Remote control of voltage).
If saturation is enabled, in the event of removal of the Vext/Pext connection (due to accidental
opening, for example) the voltage goes to the maximum value set in parameter P[16] (+14% by
default).
2. When Pext is disabled by hardware, the indicated flag defines the value to be used by the software
control of the output voltage. If RAM Voltage CTRL is deactivated (B7=0), the non volatile parameter P
[15] is used (therefore following shut down and restart of the regulator, the last value memorised
remains set): on the start up the location L[49] is initialised with the value of parameter P[15] and is
kept aligned to that value. Editing of location L[49] has no effect in this working condition. If RAM
Voltage CTRL is active (B7=1) the volatile location L[49] is used for software remote control of the
output voltage (when the regulator is energized, the value is stored. If the regulator is shut down, the
value is lost). This function is particularly useful for the applications of alternators in parallel with grid,
when the regulation of the reactive power exchanged is controlled by means of a third party supplied
digital supervisor.
FLAG RAM
Voltage CTRL
P[10] Bit B7 FLAG Ext. Input P[10] Bit B12 Output voltage control type
 0  1 Analogical without saturation
 1  1 Analogical with saturation
 0  0 Digital - Parameter P[15]
 1  0 Digital - Location L[49]
TABLE 8 : REMOTE VOLTAGE CONTROL FLAGS FUNCTION
2. Configuration word (Parameter P[10])
Configuration of the regulator takes place by setting the individual bits of parameter P[10]. Each of them
enables or disables at least one function, on the basis of the fact that its value is respectively 1 or 0.
If the "DxR Terminal" programme is used (see technical guide “Interface communication USB2DxR"), the
setting is simplified by the use of the dedicated flags in the different menu corresponding to the specific bit
which enables/disables each function.
Alternatively, the DER2 can be configured by directly setting the value of the P[10] parameter; in this case
the value is calculated before entry, summing the numbers indicated in the column "Value" of Table 7,
corresponding to the functions it is desired t enable.
For example, the default configuration calls for the bits B2, B4, B5 and those from B8 to B12 to be enabled.
The corresponding value is therefore: P[10]=4+16+32+256+512+1024+2048+4096=7988.
NOTE (1): only with single-phase reference
NOTE (2): if analogical input is disabled
NOTE (3): for analogical input