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

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2015 Sensata Technologies
Troubleshooting
4.0 Troubleshooting
This section will help you troubleshoot the ACLD when it has a fault condition. The ACLD will indicate
a particular abnormal/fault condition by how many times the Status LED blinks before pausing. To
determine the fault condition, monitor the Status LED indicator for at least 10 seconds and count
the number of blinks that occur before the LED turns off for four seconds. After determining the
number of blinks, refer to the information below to help diagnose/clear the condition.
• Blinks On 1 time then off four seconds - High Current Fault; the current is at least 30%
above rated current.
Remedy: Ensure that the load is connected and sized correctly. If the load is correct,
reset the unit. The unit is reset by pressing the ON/OFF switch on the side of the ACLD
controller to the OFF position (this removes power to the unit). After power is removed,
press the ON/OFF switch to the ON position again to restore power. If the fault recurs,
contact Sensata for service.
• Blinks On 2 times then off four seconds - High VAC In Fault; a very high AC voltage
(>275 VAC) has been detected on the AC input.
Remedy: This fault automatically clears once the AC input voltage to the ACLD falls
below 260 VAC.
• Blinks On 4 times then off four seconds - No Load Fault; no loads detected on either
output terminals (detected by minimum current fl ow to loads).
Remedy: Check to ensure that the loads are rated for 240 VAC, sized correctly (see Section
2.9.2 on load sizing criteria), and connected to the correct output terminals (see Figure 2-5).
The loads should have a resistance between 10-15 ohms (see to Figure 3-11).
Primary
Load
Secondary
Load
Ohmmeter
Use an ohmmeter to check resistance
from terminal 7 to 8 (primary load),
then from terminal 9 to 10 (secondary
load). The resistance for each load
connected should be ~10-15 ohms.
CAUTION: Ensure all power to the
ACLD is removed prior to checking
the load resistance or damage to
the ohmmeter may occur.
ACLD-40
Figure 3-11, Checking Load Resistance