64 | SAMLEX AMERICA INC.
SECTION 4 | Parameter Setup
• Parameter “LV CUT OFF TIME” [Section 4.4.2.11.2] is set to 0 sec to ensure that the unit does not shut down
completely if AC input is not restored before expiry of time set through programming parameter “LV CUT OFF
TIME” [Section 4.4.2.11]
4.4.2.23.3 Operating Sequence
1) AC input power is available – EVO operates in “Charging Mode”
2) AC input power fails: EVO transfers from “Charging Mode” to “Inverting Mode”
3) The battery continues to get discharged. When battery voltage (i) drops to value equal to / lower than the
“BATT LOW VOLTAGE” threshold [Section 4.4.2.9] for period equal to LV DETECT TIME [Section 4.4.2.10]
or (ii) momentarily drops for 1 ms to 9V or below for EVO-1212F/1212F-HW or, 18V or below for EVO-
1224F/1224F-HW, EVO’s Inverter Section is shut down and displays “Battery low voltage! fault / “Battery
ultra low voltage!” fault conditions respectively [See Srls. 1 and 2 of Table 7.1, Section 7].
• As parameter “LV CUT OFF TIME” [Section 4.4.2.11.2] has been set at 0 sec, the EVO does not shut down
completely but continues to remain in “Battery low voltage!” / “Battery ultra low voltage!” fault condition
4) AC input power is restored and is within the programmed limits of frequency and voltage
5) EVO exits “Battery low voltage!” / “Battery ultra low voltage!” and starts operating in “Charging Mode”
(say, “Operating Condition 1”)
• As soon as “Charging Mode” is activated, the Timer associated with parameter “SAFE CHARGING”
[Section 4.4.2.23] starts countdown:
o The “SAFE CHARGING” Timer will countdown to “0” min if AC input remains on for more than
the programmed value of “t” min
o The “SAFE CHARGING” Timer will NOT countdown to “0” min if AC input remains on for period
less than the programmed value “t” min
6) AC input fails again. The EVO will now operate as follows based on the condition of the “SAFE CHARGING”
Timer that recorded the time AC input was available [“Operating Condition 1” mentioned at Srl. 5 above]:
• “SAFE CHARGING” Timer value has counted down to 0 min: EVO will operate in “Inverting Mode”.
As the batteries were re-charged for sizable time period > the programmed time “t" of the "SAFE
CHARGING" timer, the battery would have charged appreciably higher than the “BATT LOW VOLTAGE”
threshold [Section 4.4.2.9]. Hence, there is LESS likelihood that high inrush current from the AC loads
would drag the battery voltage down to 9V or lower for EVO-1212F/1212F-HW or 18V or lower for EVO-
1224F/1224F-HW to trigger “Battery ultra low volt!” fault condition [See Section 7, Srl. 2 of Table 7.1]
• “SAFE CHARGING” Timer value has NOT counted down to 0 min: EVO will NOT go to Inverting
Mode but to “STANDBY” Mode [See Screen No. 1, of STANDBY MODE screens in Fig 3.1(a) & 3.1(b)].
As the batteries were re-charged for a short time period < the programmed time “t” of the "SAFE
CHARGING" timer (“Operating Condition 1” mentioned at Srl. 5 above), the battery would NOT
have charged appreciably higher than the “BATT LOW VOLTAGE” threshold (Section 4.4.2.9). Hence,
there would be MORE likelihood that high inrush current from the AC loads would drag the battery
voltage down to 9V or lower for EVO-1212F/ 1212F-HW/ EVO-2212/ EVO-3012 or 18V or lower for
EVO-1224F/ 1224F-HW/ EVO-2224/ EVO-4024 to trigger “Battery ultra low volt!” fault condition (See
Section 7, Srl. 2 of Table 7) that would require manual reset.
o If the battery is charged through external charging source [e.g. solar charging through Charge
Controller connected to the battery directly or, through terminals marked “EXT Charger” on the
front panel of the unit (3, 4 in Fig 2.1 in the attached Owner’s Manual for EVO-1212F/1212F-
HW/1224F/1224F-HW)] to voltage threshold set by parameter “RESET VOLTAGE” [Section 4.4.2.7],
the EVO will change to “INVERTING MODE”
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