-
High Voltage Fault
The average voltage is greater than the HV setting of 528. High voltage may break down motor insulation, causing premature equipment failure.
-
Low Voltage Fault
The average voltage is less than the LV setting of 432. Low voltage increases the current flow through a motor and may cause overheating.
-
Voltage Unbalance Fault
The voltage unbalance is greater than the VUB setting of 3 percent. Unbalanced voltage could cause motors to run at temperatures greater than the maximum acceptable rating.
-
Voltage Single Phasing
There is a total loss of one of the incoming phase voltages. Most motors are still capable of running when a phase is lost, possibly resulting in motor burnout.
-
Reverse Phase Fault
Two of the three phases are reversed. This would cause the motor to run in the opposite direction.
-
Overcurrent Fault
The current is greater than the OC setting of 48.3 Amps. Overcurrent typically causes overheating and may indicate severe equipment problems.
-
Undercurrent Fault
The current is less than the UC setting of 33.6 Amps. Depending on the equipment, undercurrent can result in excessive heating and pump cavitation.
-
Current Unbalance Fault
The current unbalance is greater than the CUB setting of 5 percent. Unbalanced current could cause motors to run at temperatures greater than the maximum acceptable rating.
-
Ground Fault
The ground fault current is greater than the GF setting of 4.20 Amps. Many motor insulation failures result in undesirable ground fault currents.
-
Current Single Phase Fault
There is both a single phase load-side current and line-side voltage condition. Unbalanced current could cause motors to run at higher temperatures than the maximum acceptable rating.
-
Contactor Failure
There is a single phase current condition, but the incoming voltages are acceptable. There is a good chance there are damaged contacts or loose wiring.
l1
l2
l3
control
power
start
stop
m
auto
contactor
coil
motor
Apply Power
Remove Power
Apply Power with High Voltage
Apply Power with Low Voltage
Apply Power with Voltage Unbalance
Apply Power with a Lost Phase
Apply Power with Reversed Phases
Apply Overcurrent Fault
Apply Undercurrent Fault
Apply Current Unbalance Fault
Apply Ground Fault
Apply Single Phase Fault
Apply Contactor Failure
Remove Fault (RESET)