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SECTION 4 | General Description & Principles of Operation
EXAMPLE:
1) Assume EVO-1212F is connected to the Grid input with Grid input supply circuit breaker capacity of 20A.
Parameter settings are as follows:
a) “GRID MAX CURRENT” setting = the Default value of 20A.
b) “BULK CURRENT” setting = 60A (DC). When charging at 60A on the DC side, the corresponding
AC side input current will be 11.2A (Based on Conversion Factor of 1A DC side charging current =
0.19A AC side charging current).
2) Assume that the AC pass-through load current is 5A. The total AC input current will be 16.2A i.e. 5A AC
pass-through load current + 11.2A AC input side current corresponding to 60A DC side charging current
[see 1(b) above)]. Under this condition, the EVO will operate normally because the net AC input current of
16.2A will be below 20A Default setting for parameter “GRID MAX CURRENT”
3) If now, the AC pass-through load current is increased to 15A for more than 5 sec, the total AC input
current will be 26.2A i.e. 15A pass through load current + 11.2A AC side charging current corresponding
to 60A DC side charging current [see 1(b) above)]. As the total AC input current will be 6.2A more than
the “GRID MAX CURRENT” for more than 1 sec, the AC input side charging current will be clawed back
from 11.2A to 8.8A within less than 5 sec so that the total AC input current is limited to 20A. At reduced
AC side charging current of 8.8A, the corresponding DC side charging current will be 46.3 A DC (Based on
Conversion Factor of 1A DC side charging current = 0.19A AC side charging current).
4) If now, the AC pass-through load current is increased to 22A for more than 5 sec, the total AC input
current will be 30.8A (22A pass through load current + 8.8A AC side charging current corresponding to
46.3A DC side charging current) . The AC side charging current will be automatically reduced from 8.8A
(corresponding to 46.3A DC side charging current) to 0A (corresponding to 0A DC side charging current).
However, now the AC input current will be still be 22A i.e. 2A more than the “GRID MAX” current setting
of 20A for more than 5 sec. After 5 sec of operation under this condition, the EVO will operate as follows
based the option selected through parameter “INPUT OC PROTECT” [See details of this parameter under
Section 4.5.2.10 in EVO-RC-PLUS Owner’s Manual]
o Parameter “INPUT OC PROTECT” set in the Default option “0=Inverter”: The EVO will switch over
to Inverter Mode to ensure that 22A AC load is maintained. If subsequently, the load reduces to 1A less
than the 20A setting of GRID MAX CURRENT for 5 sec, the EVO will switch back to Charging Mode
o Parameter “INPUT OC PROTECT” set for option “1= Shutdown”: EVO will be shut down.
• There will be no AC output because the Transfer Relay will be de-energized, charging will be stopped
and PWM drive to the Inverter Section will be switched off
• Fault message “Input over current” will be displayed on the LCD screen, Blue LED marked “Status”
will be switched off and Red LED marked “Fault” will be switched on
• The unit will be latched in OFF condition and will require manual reset by powering off
the unit, waiting for 1 min and then powering on again
5.3 AUTOMATIC REDUCTION OF CHARGING CURRENT IN HIGHER AMBIENT TEMPERATURES
In order to protect against over temperature shut down when operating in higher ambient temperatures of around
50C to 60C, the BULK CURRENT setting [See section 4.4.2.1 of EVO-RC-PLUS Remote Control Manual] is automatically
reduced as follows based on temperature sensed at the Power Transformer and at the Heat Sink for the Power Mosfets:
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