Curtis 1620S manual Voltage is greater than or equal to Vuvlo, and less than Vlv

Accuracy*	Definition
	1-FLA: Float voltage is set to 26.8V, Constant voltage set to 29V.
	2-SLA: Float voltage set to 27.6V, Constant voltage to 29.4V
	1-OFF: Charger goes into standby. Charger will cycle to recharge the battery as
	determined by Vrst and enter standby at the end of the charge cycle.
	2-EQUALIZE: Charger adjusts its output current to Ito, and drives the battery to Vequ.
	It has the time allotted by Tto to do this or a fault will occur.
	3-FLOAT: Charger goes into standby upon entering EoC Mode, and remains in standby
	until the battery reaches Vfloat. At this point the charger turns on and maintains Vfloat
	until power is recycled.
+/- 3%	Current used to charge the batteries during normal (bulk charge) operation. This current
	is used when the battery voltage is greater than, or equal to Vlv, and less than Vcv.
+/- 1%	Battery voltage maintained by charger during bulk charge. This voltage is maintained by
	continuously dropping the output current, until Veoc is reached.
+/- 5%	Current used to recover deeply discharged batteries; this current is used when the battery
	voltage is greater than or equal to Vuvlo, and less than Vlv.
+/- 5%	Current used to Equalize the batteries.
+/- 1%	Charger goes into "soft" overvoltage mode, from which it recovers when battery voltage
	drops below Vrst.
+/- 3%	Current at which the charger transitions to EoC mode.
+/- 1%	Used when EoC Mode is EQUALIZE or OFF; the battery voltage at which charger
	automatically turns on and recharges the battery. Charger must be in stand by mode when
	this voltage is detected; the charger will charge the battery until it reaches Vcv and then
	enter stand by mode.
+/- 1%	Battery voltage at which the charger switches from Ilv to Icc.
+/- 1%	Battery voltage below which the charger will not turn on.
+/- 1%	Used when EoC Mode is EQUALIZE. The voltage at which the EQUALIZE mode is
	ended, unless the mode ends by reaching Tto.
+/- 1%	Used when EoC Mode is FLOAT. Once the battery voltage drops to this set point, the
	charger will turn on and stay on, maintaining this battery voltage.
+/- 5min	If battery does not reach Vlv within this timeout period, an error is indicated.
+/- 5min	Used when EoC Mode is EQUALIZE. Number of hours charger is kept at equalization
	current, unless the mode is ended by reaching Vequ.
+/- 1hr	The maximum amount of time the charger has to complete a charge cycle and enter
	standby mode. Failure to complete charge in the allotted time will result in a fault mode.

Curtis 1620 Manual page 12