AUX PS Faults Board Location

The illustrations below show the Power Block Auxiliary Power Supply (AUX PS Auxilary Power Supply) board location, key cable connections, and cable connector pin maps used during troubleshooting.

Rear View for Locating the Boards for AUX PS Faults

AUX PS Faults Cable Location (Front View)

AUX PS Faults Cable Location (Rear View)

AUXPS-P190-01

AUXPS-P195-01

AUXPS-195-10

AUXPS-P190-06

AUXPS-P195-07

AUX PS Faults

This section provides information on AUX PS faults, including fault characteristics, possible causes, and recommended troubleshooting steps.

48V_OVERVOLTAGE_Fault_Shutdown

Category	Fault Source	Fault Type	Criticality
-	AUX Power Supply	Hardware	Critical

Fault Description

Fault is declared when Auxiliary Power Supply (AUX PS Auxilary Power Supply) output voltage (max. of all 3 channels) is >60 V for 30 ms. The fault is cleared if the value is ≤57 V. The fault clears after the reboot, but the fault status is retained within non-volatile memory.

Fault message is sent to PBC Power Block Controller as emergency CAN message, including the conditions that triggered the fault. Any ongoing session will be stopped gracefully. Fault information is saved as snapshot on Aux Power Supply. Load switches in Aux supply are disabled and shunt trip is triggered immediately.

Possible Causes

Possible high 480 V line
Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Inspect the incoming 480 V* and confirm if it is within expected range (+10%).

* For Europe, 400 V+ 10%.
If yes, then replace AUX PS Auxilary Power Supply to resolve the issue.
Contact ChargePoint if the issue persists.

48V_OVERVOLTAGE_Warning

Category	Fault Source	Fault Type	Criticality
-	AUX Power Supply	Hardware	Major

Fault Description

Warning message shown if any of the three AUX PS Auxilary Power Supply channels ≥55 V for 30 ms.

The lower threshold is 52 V for the warning to clear.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_UNDERVOLTAGE_Warning

Category	Fault Source	Fault Type	Criticality
-	AUX Power Supply	Hardware	Major

Fault Description

Warning message shown if any of the three AUX PS Auxilary Power Supply channels <38 V for 60 s.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_PBC_OVERLOAD_Warning

Category	Fault Source	Fault Type	Criticality
-	AUX Power Supply	Hardware	Major

Fault Description

This warning message is seen when the PBC Power Block Controller output current is >1 A for 10 s.

The fault clears if the current <1 A for more than 3 seconds.

The fault snapshot is saved on AUX PS Auxilary Power Supply and no other action is taken.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_CC_OVERLOAD_Warning

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Major

Fault Description

This warning message is seen when CCB output current is >30 A for 10 s.

The fault clears if the current <30 A for more than 3 seconds. The system is derated accordingly till the warning stays.

The fault snapshot is saved on AUX PS Auxilary Power Supply and no other action is taken.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry fault
Some obstruction to the fan or pump maybe

Troubleshooting

Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_EXT_OVERLOAD_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This warning message is seen when EXT output current is >27 A for 10 s.

The fault clears if the current <27 A for more than 3 seconds.

Any ongoing session will be stopped and the fault snapshot is saved on AUX PS Auxilary Power Supply and no other action is taken.

Possible Causes

Possible fluctuations on the 480 V line
Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Inspect the incoming 480 V if the warning is seen regularly.
Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_EXT_PG_STATUS_LOST_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault is noted when EXT_PG (Power Good) signal transitions from 1 to 0, indicating that something went wrong on the 48V_EXT line. Fault can be cleared from PBC Power Block Controller or rebooting system (PBC Power Block Controller, if possible).

This fault will stop any ongoing session and PBC Power Block Controller will try to reset the 48V_EXT. PBC Power Block Controller also stores the snapshot of the failure and reports failure to NOS Network Operating System. System will be locked if the fault is seen 3 times within 24 hours.

Possible Causes

Possible fluctuations on the 480 V line
Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Inspect the incoming 480 V if the warning is seen regularly.
Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_PBC_PG_STATUS_LOST_Warning

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Major

Fault Description

This fault is noted when PBC Power Block Controller_PG (Power Good) signal transitions from 1 to 0, indicating that something went wrong on the PBC Power Block Controller 48 V line. Fault can be cleared by rebooting system.

This fault will stop any ongoing session. System will be locked if the fault is seen 3 times within 24 hours.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Inspect the incoming 480 V if the warning is seen regularly.
Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

48V_CC_PG_STATUS_LOST_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Major

Fault Description

This fault is noted when CC_PG (Power Good) signal transitions from 1 to 0, indicating that something went wrong on the CC 48 V line. Fault can be cleared by rebooting system.

This fault will stop any ongoing session. System will be locked if the fault is seen 3 times within 24 hours.

Possible Causes

Possible fluctuations on the 480 V line
Internal AUX PS Auxilary Power Supply circuitry fault

Troubleshooting

Reach out to ChargePoint for further debugging of AUX PS Auxilary Power Supply if the issue persists three times in 24 hours.

Shorted_MOSFET_CC _Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault indicates 48 V CC load switch MOSFET failed due to short circuit. This is reported if the fault exists for 10 s (1 s sampling time). Snapshot of the failure along with operating conditions are stored on PBC Power Block Controller and reported to NOS Network Operating System. The ongoing charging session is derated to 50%.

The self test to determine if the fault is real is performed and if TRUE, the system is disabled until serviced.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

Shorted MOSFET PBC_Warning

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault indicates 48 V PBC Power Block Controller load switch MOSFET failed due to short circuit. This is reported if the fault exist for 10 s (1 s sampling time). Snapshot of the failure along with operating conditions are stored on PBC Power Block Controller and reported to NOS Network Operating System.

The self test to determine if the fault is real is performed and if TRUE, the system is disabled till serviced.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

Shorted MOSFET EXT_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault indicates 48 V PBC Power Block Controller load switch MOSFET failed due to short circuit. This is reported if the fault exists for 10 s (1 s sampling time). Snapshot of the failure along with operating conditions are stored on PBC Power Block Controller and reported to NOS Network Operating System.

The ongoing session will continue as long as 48V_EXT current draw is <15 A. If it is >15 A, then the session is stopped and the system is disabled.

The self test to determine if the fault is real is performed and if TRUE, the system is disabled till serviced.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

48V_EXT_HW_Overcurrent_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault is triggered when current consumption on EXT channel exceeds 28 A. This also changes the EXT_PG signal to LOW.

Any ongoing session will be stopped and Power Link 1000 will be disabled (as 48 V is not present anymore). PBC Power Block Controller stores the fault snapshot. PBC Power Block Controller tried to enable 48V_EXT_OUT after 30 s of session stop. If the issue is noted 3 times in 24 hours, then system is disbaled till service.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply.

48V_PBC_HW_Overcurrent_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault is triggered when the current consumption on the PBC Power Block Controller channel exceeds 2 A. This also changes the PBC Power Block Controller_PG signal to LOW.

Any ongoing session will be stopped (as 48 V is not present anymore). AUX PS Auxilary Power Supply stores the fault snapshot. AUX PS Auxilary Power Supply tries to re-enable 48V_PBC Power Block Controller power after 10 s (3 attempts made - 60 s interval). System locked out if unable to reenable.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

48V_CC_HW_Overcurrent_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

This fault is triggered when current consumption on CC channel exceeds 28 A. This also changes the
CC_PG signal to LOW.

Any ongoing session will be stopped (as 48 V is not present anymore). AUX PS Auxilary Power Supply stores the fault snapshot. AUX PS Auxilary Power Supply tries to re-enable 48V_CC power after 10 s (3 attempts made - 60 s interval). System locked out if unable to reenable.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

Aux_PS_Overtemp_Warning

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Major

Fault Description

Fault declared when TEMP0 or TEMP1 from AUX PS Auxilary Power Supply is above 80° C for 10 s. The fault is cleared if this value is <80° C for 3 s. PBC Power Block Controller tracks and reports both these temps.

PBC Power Block Controller confirms if this fault is true and then derates the PB output to 50%. PBC Power Block Controller stores the fault and snapshot - reports to NOS Network Operating System.

PB is disabled if the error is seen 3 times within 24 hours.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

Aux_PS_Overtemp_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

Fault declared when TEMP0 or TEMP1 from AUX PS Auxilary Power Supply is above 90° C for 10 s. The fault is cleared if this value is <90° C for 3 s. PBC Power Block Controller tracks and reports both these temps.

After 30 s, the load switch to 48 V CC and EXT is disabled.

PBC Power Block Controller stores the fault and snapshot - reports to NOS Network Operating System.

PB is disabled if the error is seen 3 times within 24 hours.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

LLC_Current_Imbalance_Warning

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Major

Fault Description

Monitor the current being supplied by each of the three LLC outputs, if there is a discrepancy exceeding

Fault set threshold of 2 A for 10 s. Fault clears if the difference is less than 1.5 A for 3 s.

Fault is reported to PBC Power Block Controller every 1 s and also stores the snapshot from failure. Allow the Power Block operation if the sum of PBC Power Block Controller_I_OUT, CC_I_OUT and EXT_I_OUT is less than 40 A.

Derate the Power Block to 50% if the sum PBC Power Block Controller_I_OUT, CC_I_OUT and EXT_I_OUT is greater than 40 A.

PBC Power Block Controller shall communicate to NOS Network Operating System and update the error messages and error cycle count.

Disable the Power Block if error persists for more than 48 hours, requiring maintenance of Aux PS.

Possible Causes

Imbalance in input 3 phase voltage
Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Inspect 3-phase voltage for any imbalance.
Replace AUX PS Auxilary Power Supply.

Aux_PS_Fan_Failed_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

Fault is declared if the AUX PS Auxilary Power Supply FAN speed RPM is 20% away from expected range for more than 10 s. It is cleared if the FAN speed RPM is in the expected range for 3 s. Fault is reported to PBC Power Block Controller every 1 s and also stores the snapshot from failure. Power Block is disabled if this error is seen 3 times in 24 hours.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

Fan_Overcurrent_Shutdown

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Critical

Fault Description

Fan load switch overcurrent fault. nFLT signal from Fan load switch is monitored and trigger a fault when nFLT signal goes “LOW”.

Disable the Aux PS Fan nEN_FAN after detecting fan overcurrent fault. Fault is reported to PBC Power Block Controller every 1 s and also stores the snapshot from failure. Power Block is disabled if this error is seen 3 times in 24 hours.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry

Troubleshooting

Replace AUX PS Auxilary Power Supply

Relative_Humidity_Warning

Category	Fault Source	Fault Type	Criticality
48 V signal	AUX Power Supply	Hardware	Major

Fault Description

Fault is reported if relative humidity exceeds 80% for more than 10 s. It will clear if it is less than 80% for 3 s. Fault is reported to PBC Power Block Controller every 1 s and also stores the snapshot from failure.

Possible Causes

Internal AUX PS Auxilary Power Supply circuitry
Actual high humidity event

Troubleshooting

Replace AUX PS Auxilary Power Supply