Magnum Energy MMS Series - Manual (Page 36)

© 2014 Magnum Energy, Inc.
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
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
(per the ‘Adj Batt
AmpHrs’ setting)
Figure 16, 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
(80 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 from Standby mode
to Inverter mode averages approximately 16 milliseconds. While the
MMS 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 effective transfer
will be and therefore, the higher the probability for the output loads
to reset. This occurs because the incoming AC voltage 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
generators (or large generators with an unstable output) may nui-
sance transfer. This commonly happens when powering loads that
are larger than the generator can handle—causing the generator’s
output voltage to constantly fall below the inverter’s input VAC drop-
out 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.
30
Operation