Magnum Energy MMS-E Series - Manual (Page 34)

© 2011 Magnum Energy, Inc. 27
3.0 Operation
Constant
Current
Reduced
Current
Reduced
Voltage
Absorb volts
‘Adj
Charge
Rate’
Setting
Increased
Voltage
Constant
Voltage
Monitored
Voltage
No Current
Time
Float
volts
Monitored
Current
Absorb Time
(per the ‘Adj Batt
AmpHrs’ setting)
Bulk
Charging
Absorb
Charging
Float
Charging
DC
Voltage
DC
Current
Full
Charge
Goes to Full Charge
after 4 hours in
Float Charge
Absorb and Float voltage settings are
determined by the ‘battery type’ selection
Figure 3-1, Automatic 4-Stage Charging Graph
Transfer Time - While in Standby mode, the AC input is continually
monitored. Whenever AC power falls below the VAC dropout voltage
(150 VAC, default setting), the inverter automatically transfers back
to Inverter mode with minimum interruption to your appliances – as
long as the inverter is turned on. The transfer time from Standby
mode to Inverter mode averages approximately 16 milliseconds.
While the MMS-E Series is not designed as a computer UPS system,
this transfer time is usually fast enough to hold them up. However,
the VAC dropout setting has an effect on the ability of the loads to
transfer without resetting. The lower this setting, the longer the ef-
fective transfer will be and therefore, the higher the probability for
the output loads to reset. This occurs because the incoming AC volt-
age is allowed to fall to a level that is so low that when the transfer
does occur, the voltage on the inverter’s output has already fallen to
a low enough level to reset the loads.
The disadvantage of a higher VAC dropout setting is that smaller gen-
erators (or large generators with an unstable output) may nuisance
transfer. This commonly happens when powering loads that are larger
than the generator can handle – causing the generator’s output volt-
age to constantly fall below the inverter’s input VAC dropout threshold.
Info: You must use the ME-RC50 or ME-ARC50 remote
to adjust the VAC dropout setting – which in turn
determines the VAC dropout threshold.
Info: When switching from Inverter mode to Standby
mode, the inverter waits approximately 15 seconds to
ensure the AC source is stable before transferring.