TP-6805 8/15 91Section 5 Troubleshooting
Troubleshooting Tables
The following tables list potential load management device operation problems and recommendations for
troubleshooting.
Load management functional issues.
Problem Check
Load shed AC relays do not activate. Verify 120 VAC supply voltage to relays.
Verify correct wiring to the load management device board and AC relays.
Metering always reads 0% under load. Verify that the Emergency feed to the ATS goes through the CT correctly.
Verify that the CT leads are connected to the load management device input
correctly.
Verify that the correct CT is used. (400 A to 3V)
Metering never reads 0%. Verify that the CT is wired correctly.
Verify that twisted-pair cable was used.
Verify that CT wiring is in separate conduit from AC leads.
Load A does not add after initial shed. Verify that the correct size wires are used for PWR and COM connections from
the generator set controller to the load management device. See the
installation instructions for the load management device.
Load management does not shed enough load for the generator to recover.
Problem Check
HVAC units do not shed. Verify normally closed (NC) output is used to control HVAC.
Does not shed when load is between 85%
and 90%.
Verify that the load is not intermittently dropping below 85%.
Verify that the load remains above 90% for at least 40 seconds.
Verify that the % load is metering correctly.
Verify that the overload percent is set at 10% or more below indicated level.
Verify that the load management device is communicating with the generator
set controller.
Does not shed when load is at 100%. Verify that the % load is steady at 100% for approximately 25 seconds.
Verify that the % load is metering correctly.
Verify that the overload percent is set at 10% or more below indicated level.
Verify that the load management device is communicating with the generator
set controller.
Does not shed when load is greater than
110%.
Wait at least 15 seconds.
Verify that frequency is greater than 59 Hz.
Verify that the load management device is communicating with the generator
set controller.
Generator still overloaded when all loads
are shed.
Verify that only non-essential loads are connected through the Load Shed Kit.
Correctly set up unused relays for the run length.
Verify that all load management device AC relays are properly supplied.
Verify that the wire size is correct for the run length.
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