What to do if Curtis 1239E Controller shows Overcurrent Shutdown?
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Rebekah MorrisAug 17, 2025
If your Curtis Controller shows an Overcurrent Shutdown, it indicates that the phase current exceeded the current measurement limit. This can be caused by:
1. An external short in the phase U, V, or W motor connections.
2. Mis-tuned motor parameters.
3. A defective controller.
4. Speed encoder noise problems.
To clear this, cycle KSI (Key Switch Input).
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Jacqueline CoxAug 20, 2025
What to do if my Curtis 1239E Controller displays a Current Sensor Fault Shutdown?
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Sarah ClementsAug 20, 2025
If your Curtis Controller displays a Current Sensor Fault Shutdown, it means the controller's current sensors have an invalid offset reading. This can occur due to:
1. Leakage to the vehicle frame from phase U, V, or W (short in motor stator).
2. A defective controller.
To clear the fault, cycle KSI.
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Anthony WaltersAug 22, 2025
Why does my Curtis 1239E show a Precharge Failed Shutdown?
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Stephanie MayAug 23, 2025
A Precharge Failed Shutdown on your Curtis Controller indicates that the precharge process failed to charge the capacitor bank to the KSI voltage. This can be due to:
1. Refer to the Monitor menu, Battery: Capacitor Voltage for more details.
2. An external load on the capacitor bank (B+ connection terminal) preventing charging.
To resolve this, cycle the Interlock input or use the VCL function Precharge().
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Shane SmithAug 26, 2025
How to troubleshoot a Precharge Failed error on a Curtis 1239E Controller?
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Marcus HouseAug 26, 2025
Precharge failure in a Curtis Controller means the precharge has failed to charge the capacitor bank to the KSI voltage. This can be caused by an external load on the capacitor bank (B+ connection terminal) preventing charging. To clear it, cycle the Interlock input or use the VCL function Enable_Precharge().
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vstevensAug 28, 2025
What to do if Curtis 1239E Controller shows Severe Undertemp Shutdown?
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Dawn JonesAug 28, 2025
If your Curtis Controller displays a Severe Undertemp Shutdown, it means the heatsink temperature is below -40°C. This can happen because:
1. Refer to the Monitor menu, Controller: Temperature for more details.
2. The controller is operating in an extreme environment.
To clear this, bring the heatsink temperature above -40°C, and then cycle the interlock or KSI.
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Anthony FlemingAug 31, 2025
What to do if my Curtis Controller shows a severe overtemp?
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Michael HodgesAug 31, 2025
If the Curtis Controller's heatsink temperature rises above +95°C, it triggers a severe overtemp condition. This could be due to the controller operating in an extreme environment, excessive vehicle load, or improper mounting. To resolve this, reduce the heatsink temperature below +95°C and cycle the interlock or KSI.
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Sherry BeasleySep 2, 2025
How to fix a Curtis Controller overcurrent issue?
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Megan BryantSep 2, 2025
Controller overcurrent can occur if the phase current exceeds the current measurement limit. This can be caused by an external short in the phase U, V, or W motor connections, mis-tuned motor parameters, a defective controller, or speed encoder noise problems. To clear this, cycle the KSI.
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Kristin PhillipsSep 5, 2025
Why does my Curtis Controller show a severe B+ undervoltage?
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tina46Sep 6, 2025
Severe B+ undervoltage in a Curtis Controller happens when the capacitor bank voltage drops below the Severe Undervoltage limit with the FET bridge enabled. This can be caused by misadjusted battery parameters, non-controller system drain on the battery, high battery resistance, the battery disconnecting during driving, or a blown B+ fuse. To resolve, bring the capacitor voltage above the Severe Undervoltage limit.
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Pamela MillerSep 8, 2025
What causes a Curtis 1239E severe undertemp error?
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christina53Sep 8, 2025
If the Curtis Controller's heatsink temperature falls below -40°C, it triggers a severe undertemp condition, often due to operating in an extreme environment. To resolve this, bring the heatsink temperature above -40°C and cycle the interlock or KSI.
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andersonkyleSep 12, 2025
Why is my Curtis Controller showing a severe KSI undervoltage?
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michaelalexanderSep 12, 2025
Severe KSI undervoltage in a Curtis Controller occurs when the KSI voltage drops below the Brownout Voltage for 2 seconds. This can be due to a non-controller system drain on the battery/KSI circuit wiring, KSI disconnecting while driving, or a blown KSI fuse. To fix this, bring the KSI voltage above the Brownout Voltage.