Magnum Energy AC Load Diversion Controller (ACLD-40) - Manual (Page 38)

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2015 Sensata Technologies
Operation
3.7 Operating Modes
Once the ACLD load controller is powered and turned on, it has three normal operating modes:
• Inactive - The ACLD is inactive (not regulating the battery voltage) because utility power is
connected to the MS-PAE Series inverter. During the inactive mode, the MS-PAE Series inverter is
using the utility grid connected to its input to provide multi-stage charging to the battery bank.
• Standby - In the Standby mode, the ACLD no longer senses utility power and begins monitoring
the battery voltage to determine when to become “active” and begin diverting power. Once
Standby mode has been initiated, the ACLD then determines the regulation stage. If the battery
voltage is low (≤12.8 VDC/12v inverters, ≤25.6 VDC/24v inverters, or ≤51.2 VDC/48v inverter),
the ACLD initiates the Bulk stage (i.e., ‘Standby - Bulk’). If the battery voltage is high (≥12.9
VDC/12v inverters, ≥25.7/24v inverters, or ≥51.3/48v inverters), the ACLD will skip the Bulk
and Absorb stages and go directly to the Float stage (i.e., ‘Standby - Float’).
During Standby mode, the ACLD will be in one of the following regulation stages:
Standby - Bulk: The battery voltage is below the Absorb Voltage setting and remains in the
Bulk stage until the battery voltage has reached the Absorb Voltage setting.
Standby - Absorb: The battery voltage has reached the Absorb Voltage setting and remains in
the Absorb stage until the Absorb Time Done setting has been satisfi ed.
Standby - Float: The battery voltage is in the Float stage and remains in this stage unless the
battery voltage falls to a low voltage, which will start another Bulk Charge stage.
• Active - In the Active mode, the ACLD is actively diverting excess current—from the renewable
energy source—to regulate the battery voltage by connecting external diversion loads.
During Active mode, the ACLD will be in one of the following regulation stages:
Active - Bulk: If the battery voltage begins rising quickly, the ACLD activates and starts diverting
current in an attempt to keep the voltage from rising above the absorb voltage setting. The
ACLD remains in the Bulk stage until the battery voltage has reached the Absorb Voltage setting.
Active - Absorb: Current is being diverted to the external load to regulate the battery bank at
the Absorb Voltage setting. The ACLD will remain in the Absorb stage until the Absorb Time
Done setting has been satisfi ed.
Active - Float: Current is being diverted to the external load to regulate the battery bank at
the Float Voltage setting. The ACLD remains in this stage unless the battery voltage falls to a
low voltage, which will start another Bulk Charge stage.
The ACLD also includes an extensive protection circuitry to shut down the controller under certain
fault conditions. When the ACLD is in a fault condition, the controller’s green LED blinks 1-10
times (depending on the fault) and then pauses for four seconds. See Section 4.0 to determine
the fault condition and fi nd help with troubleshooting.
3.8 Monitoring the ACLD Controller with a ME-ARC Remote Display
The ACLD controller—when connected to a ME-ARC remote control display (Version 4.0 or greater)—
provides access to ACLD meters and the status of the ACLD. This gives you the ability to monitor
the ACLD controller’s operation remotely. For specifi c information on the ACLD menus displayed
on the ME-ARC, see the ME-ARC (V4.0) Owner’s Manual (PN: 64-0030 Rev C).
Info: The ME-RC and ME-RTR can be used with and confi gure the ACLD, however,
only the ME-ARC remote (version 4.0 or higher) provides displays for the ACLD that
indicates: ACLD Status, Power Diverted, ACLD Temperature, Target Volts, Model, and
Software Version.