Installation Manual

© 2014 Magnum Energy, Inc.Page 25
Setup
CAUTION: Unless you have an MS Hybrid Series inverter/charger—which has the Load
Support feature—the AC Input Amps setting only limits the current to the battery; it
does not limit the current to the inverter loads. If the current from the loads on the
output of the inverter is greater than the circuit breaker rating on the incoming AC
source, you will experience nuisance tripping.
Where should I set AC Input Amps? This setting needs to be set differently depending on your
inverter/charger model—as described below:
ME, MS, and RD Series: These models connect to a single AC source and have two inputs (HOT
IN 1 and HOT IN 2), but the current is only monitored on HOT IN 1. On these models—when wired
as a dual-in confi guration or as a single-in confi guration with only the HOT IN 1 connected—the
AC Input Amps setting should be set to the size of the AC circuit breaker that feeds the HOT IN
1 input. On these models, when wired as a single-in confi guration with HOT IN 1 and HOT IN 2
jumped together, set the AC Input Amps setting to half (x½) the input breaker size—as half the
current will pass through HOT IN 1 and the other half through HOT IN 2 simultaneously.
MS-AE and MS-PAE Series: These models connect to a single AC source and have two inputs
(HOT IN 1 & HOT IN 2), with the current monitored on both inputs at the same time. Since the
input is from a single AC source, both of the input currents are added, then divided in half to de-
termine the AC Input Amps setting. If the input breaker is a dual-pole (120/240 VAC input), set
the AC Input Amps setting to the value of only one of the breaker poles (i.e., 30A dual-pole = 30A
setting). If the input breaker is a single-pole (120 VAC input) and connected to only one input, set
the AC Input Amps setting to one-half the input breaker size (i.e., 30A single-pole = 15A setting).
MS-E, MS-PE, MSH-M and RD-E Series: These models connect to a single AC source and have
one input. Set the AC Input Amps setting to match the input AC circuit breaker size.
MSH-RE Series: These models can connect to two AC sources and have two inputs (AC1 & AC2),
with the current monitored on each input separately. AC1 is set to the size of the utility breaker
feeding the AC1 input, and the AC2 is set to the size of the gen’s breaker feeding the AC2 input.
MM, MM-AE and MMS Series (and any export version of these models): These models do
not monitor current on the input, therefore cannot benefi t from the AC Input Amps setting or fea-
ture. On these models, even though the AC Input Amps setting may display and allow selection/
adjustment, this setting will not do anything to reduce the battery charger current.
Info: If you are supplying two AC sources (utility and generator) to the inverter’s single
input through an AC transfer switch, adjust the AC Input Amps setting to the smaller AC
circuit breaker size of the two AC sources.
Info: The AC Input Amps setting is dependent on the stability of the AC source. If
using a generator, factors such as altitude and output voltage regulation may require
a lower setting than the generator’s circuit breaker size. For best performance, lower
the AC Input Amps setting to 1/3 of the generator’s rated capacity, and then while
the generator is heavily loaded, gradually increase the setting as high as possible, but
ensure the voltage level stays above the 03B VAC Dropout setting.
• 03B VAC Dropout – Selects the minimum AC voltage that must be present on the input
before the inverter/charger connects to the AC input and switches from Inverter mode to
Standby mode. This setting also determines the lowest AC voltage that is allowed before the
charger disengages and the inverter (if enabled) resumes powering the AC loads from the
inverter’s battery power—to protect AC loads during utility outages.
Example: If the VAC Dropout setting is 60 VAC, then the AC input voltage must be above 60
volts before the inverter connects and switches from Inverter mode to Standby mode. Once the
AC is connected, the AC voltage must drop below 60 VAC to switch back to Inverter mode.
Settings for all models except MSH4024RE:
◊ Set VAC Dropout (AC1 only) – Sets at what AC voltage—from the HOT IN 1 to NEUT IN
1 terminals—the inverter/charger will connect to or disengage from the incoming AC.
Default setting: 80 VAC (150 VAC for export models)
Range: 60-100 VAC, UPS Mode