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SECTION 4 | Parameter Setup
NOTE: For supplementary details on synchronized transfer of AC power, please refer to Section 4.5.4 to 4.5.7 of
Owner’s Manual for EVO-2212/3012/2224/4024
Parameter “SYNC GEN” is used to program the desired sensitivity of frequency and phase synchronization of the
Inverter Section with the AC input voltage fed at the AC Input Terminals marked “GEN” (7,8,9 in Fig 2.3 in Owner’s
Manual for EVO-2212/3012/2224/4024).
2 programming options are available for this parameter: (i) Option “1= Coarse” (Default option) – see Section 4.5.2.10(a)
below and (ii) “Option 0= Fine” – see Section 4.5.2.10(b) below
When EVO-2212/3012/2224/4024 is operating in Inverting Mode (there is no AC input), its output frequency will be
equal to the frequency that has been selected by the programming parameter “DEFAULT FREQ” i.e. 60Hz (Default) or
50Hz (TABLE 4.6 and Section 4.5.2.1). When AC input is made available at AC Input Terminals marked “GEN” (7,8,9 in
Fig 2.3 in Owner’s Manual for EVO-2212/3012/2224/4024), it is rst monitored for 2 sec. If it is within the programmed
values of (i) frequency limits (TABLE 4.4), (ii) low voltage limits (TABLE 4.5) and (iii) high voltage limits (TABLE 4.6),
synchronization process is initiated to synchronize the frequency and phase of the Inverter Section with the incoming
AC input voltage. Details are given below:
a) Parameter SYNC GEN set at Option 1= Coarse (Default)
This is the “Default Setting”. This setting is applicable when a Generator is connected to AC Input
Terminals marked “GEN” (7,8,9 in Fig 2.3 in Owner’s Manual for EVO-2212/3012/2224/4024). As
compared to very stable frequency of Grid / Inverter Generator, the frequency of a Generator may
vary considerably depending upon the performance of its Speed Governor that compensates for the
drop in RPM / frequency when electrical load is switched on / increased or, rise in RPM / frequency
when electrical load is decreased / switched off. Hence, if synchronization sensitivity is set at “0=
Fine” as in Section 4.5.2.10 (b) below, it may take very long for the Inverter Section to synchronize
with the Generator or, may not synchronize at all. Under this option, the frequency and phase of
the Inverter Section are synchronized with the Generator differently as follows:
i. First, the frequency of the Inverter Section is NOT tracked at 0.1Hz per cycle as in Option “0=
Fine” [See Section 4.5.2.10(b) below] but is made equal to the Generator frequency at zero
crossing of the Inverter voltage.
ii. Then, the phase of the Inverter voltage relative to the Generator voltage is tracked by 1º
per cycle. When the phase of the Inverter Section is within ± 10.5º of the Generator input
voltage waveform, the Transfer Relay is activated to transfer the AC load from the Generator
to the Inverter Section at zero crossing of the voltage waveform
b) Parameter SYNC GEN set at Option “0= Fine”
This setting is selected if Grid / Inverter Generator is connected to AC Input Terminals marked
“GEN” (7,8,9 in Fig 2.3 in Owner’s Manual for EVO-2212/3012/2224/4024). Synchronization
control logic used in this option is suitable for more stable frequency output of Grid / Inverter
Generator. Under this option, the frequency and phase of the Inverter Section are synchronized with
the Grid as follows:
i. First, the frequency of the Inverter Section is tracked in steps of 0.1Hz per cycle and made
equal to the frequency of the Grid / Inverter Generator input.
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