Service Home PSUP PCB - Troubleshooting Guide - NGC

PSUP PCB - Troubleshooting Guide - NGC

Last updated: 08/30/2021

PSUP PCB - Troubleshooting Guide - NGC

Introduction

  • Embeds the Power Fault Detect Module. Now standard on all machines equipped with the Next Generation Control.
  • Indicates the Status of the three phase power.
  • Low Voltage power indicator LEDs.
  • Circuit breaker open indicator circuit.
  • Added a ground fault detect circuit for the 115 VAC line.

Depending on the PSUP version, it may have two or three fuses for different circuits. The universal reference designator for a fuse is “F” or “FU”.

F1 is used to protect the ON/OFF circuit during a power spike or transient.

On PSUP N and newer, F2 is used on the input of the Bridge rectifier for the capacitor bank that is part of the PFDM. This fuse will open if:

1.   The bridge BR1 is shorted.

2.   If any of the alum electrolytic capacitors is shorted

3.   If the LVPS is shorted

 

 

Electrical Safety

 Caution: When you do maintenance or repair on CNC machines and their components, you must always follow basic safety precautions. This decreases the risk of injury and mechanical damage.

  • Set the main circuit breaker to the [OFF] position.

 Danger: Before beginning any work inside the control cabinet the High Voltage indicator light on the 320V Power Supply / Vector Drive must have been off for at least 5 minutes.

Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fully understand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule a service visit.

Symptom Table

Symptom / Alarm Possible Cause Corrective Action
Alarm 552 TRIPPED CIRCUIT BREAKER There is an current overload or short-circuit detected at the power distribution PCB. One or more circuit breakers is not installed correctly. Check the Power Distribution PCB. Make sure the circuit breakers are properly seated.
The TSC jumper JP2 is missing. On machines without TSC/HPC circuit breaker jumper JP2 must be installed.
A short-circuit detected on CB3 coolant pump breaker, CB3 tripped.
  1. Check 240VAC cable from PSUP (P9) to I/O PCB (P30). Make sure that cable is not pinched. Make sure that cabled is wired correctly.
  2. Check the 240VAC cable from I/O (P29) to coolant pump amphenol. Make sure the cable is not pinched. Make sure that cable is wired correctly.
  3. Disconnect the connector from I/O PCB (P29) and check red and black wire to ground they should read open (O.L).
  4. Check for short-circuit on coolant pump/cable. Refer to the: Standard Coolant - System - Troubleshooting Guide
(Single-phase machines only), Alarm 552 TRIPPED CIRCUIT BREAKER occurs when the coolant pump gets commanded to turn on.

Note: The circuit breaker did not trip.

 The 240 VAC input cable connected to the PSUP at P11 is not correct. Turn off the main breaker and disconnect 240 VAC input cable from the PSUP at P11 and swap the white and black wire positions on the cable.
Alarm 9101 RESETTABLE SOFTWARE ERROR One or more circuit breakers is turned OFF. Check the Power Distribution PCB. Find the cause of the short-circuit then turn the circuit breaker back on.

Alarm 175 GROUND FAULT DETECTED 

Alarm 9803 120VAC GROUND FAULT

Alarm 9804 240 VAC GROUND FAULT

 There is a short circuit in one of the 115 / 230 VAC components. Spindle motor/cable and Axis motors/cables as well. Refer to the Next Generation Control - I/O PCB - Troubleshooting Guide.
Alarm 9902 GROUND FAULT One of the PSUP circuit breakers is not installed correctly. Check all the circuit breakers tabs to make sure they are installed inside the female tabs.

Alarm 840 INCOMING AC LINE VOLTAGE TOO LOW DURING POWER UP

or the AC Line Voltage gauge is not showing the correct reading.		 There is a problem with the incoming voltage.  Check the incoming voltage and make sure the transformer taps are in the correct location. 
The voltage monitor circuit on the power card PCB is not outputting the correct reference voltage. Make sure the PFDM on PSUP PCB is putting the correct reference voltage to NGC Main PCB.
The Power Card was replaced with a REV - P but the patch file was not installed or the software upgraded. If the machine has a 4075-N and software version lower than 100.16.000.1040 you must install a patch to change parameter 2009 before you install the replacement PSUP PCB. Failure to do so will cause then machine to shut down immediately upon power up.

If you are replacing a 4075-P with a 4075-P no patch is required.

Refer to: Next Generation Control - Patch File Load/Uninstall

If you install the 4075-P or 4075-T on a machine with software lower than 100.16.000.1040 and did not applied the patch, you must do a clean software installation. Refer to

Next Generation Control - Software Download and Update - Clean Installation
Alarm 840 INCOMING AC LINE VOLTAGE TOO LOW DURING POWER UP

Alarm continues to appear after replacing the PSUP PCB with 4075- REV - P.		 There is a defective component on the PSUP PCB - REV - P. Contact the service department for troubleshooting information.
The machine will not turn on. The F1 fuse is blown.

Check F1 fuse, check the JP1 jumper to be installed if the machine has a High Voltage service input (380-480 VAC).

Note: If the machine is a 240VAC and it has a 60HP vector drive, make sure a 2A CERAMIC FUSE is installed at F1.
There is problem with the power on/off circuit. Refer to: Next Generation Control - Power On/Off Circuit, Main Transformer - Troubleshooting Guide.
There is a problem with low voltage power supply (PSUP).  Using the multimeter on diode mode, check across the 3 diodes next to the 3 LED's on the PSUP. Reverse the multimeter leads. Make sure the meter shows a voltage drop (~0.4V to 0.8V) in one direction and O.L. in the other direction. If not, the diode is shorted and the PSUP needs to be replaced. 

Power Fault Detect Module (PFDM) Reference Voltage

  

  

There is an embedded power fault detect monitor built-in to the NGC power card PCB. The circuit monitors the 115VAC output of the main transformer (TB 94, 95). This circuit produces a 0 - 5 VDC reference voltage to the main NGC PCB. This reference voltage varies in proportional to the incoming AC voltage. The variance in this voltage will cause the AC Line Voltage gauge to change. When the output of the transformer equals 120 VAC the control will show 100% AC LINE VOLTAGE. This gauge is located under DIAGNOSTIC / GAUGES. 

 Note: The data signal input from the PFDM can be viewed under the MOCON Tab listed as Pfdm Incoming Power Voltage.

Corrective Action:

  1. Measure the incoming AC voltage to the machine.
  2. Make sure the transformer taps are in the correct voltage range.
  3. Make sure the 115 VAC output cable from the transformer terminal block 94, 95 is properly connected to the power card at P1.

     Note: When the 115 VAC output of the transformer equals 120VAC the control will show 100% AC LINE VOLTAGE.

  4. Measure the brown and the blue wire on the PSUP PCB behind the P20 connector (see illustration) .

     Caution: Make sure you use needle tip leads on your meter. Be careful not to short your leads together this can cause damage to the NGC power PCB.

    IMPORTANT: When the AC Line Voltage gauge displays 100% the following voltages are expected:
    • For a Rev -N Power Card 3.56 VDC.
    • For a Rev -P or -T Power Card 3.74 VDC.
    If the voltage is low or no voltage is measured, the voltage monitor circuit on the power card is damaged and will need to be replaced.

    If the voltage is correct:

    • For a Rev -N Power Card make sure parameter 2009 ADC VALUE FOR AC INPUT is set to 3550.
    • For a Rev -P or -T Power Card make sure parameter 2009 ADC VALUE FOR AC INPUT is set to 2850.

     Note: To view the parameter values refer to Next Generation Control - How to Read an Error Report for more information.

     

    If the value of parameter of 2009 is not correct you will need to load a patch file. Go to the HBC site and click on Service>NGC-Configuration, and download the patch.

Low Voltage Inspection

Corrective Action:

Measure the low voltage power supply voltage levels at the Maincon PCB. Make sure you do not short or cross your multimeter pins.

Cycle power to the machine. If the fault stays, then the amplifier is faulty.

If every axis amplifier in the machine generates the alarm at the same time, and the low voltage power supply is correct, then the Maincon PCB may be at fault.

Pins Correct Voltage
+5 and GND +4.90 to +5.20 V dc
+12 and GND +11.85 to +12.50 V dc
-12 and GND -11.85 to -12.50 V dc

PCB Component Inspection

Intermittent symptoms or alarms can be caused by component failure. Below is a list of possible failures:

  1. Missing solder on all or some components pins
  2. Poor solder
  3. Solder bridges
  4. Wrong component installation (orientation)
  5. Missing components

     Note: Some PCB's have unused circuits and are missing components intentionally, look for broken off components.

  6. Broken components
  7. Broken pins on IC's
  8. Bent pins on the connectors
  9. Circuit breakers not installed correctly.

Use a magnifying glass to inspect the circuit components on the front and back of the PSUP PCB. Below are the circuit component zones to inspect depending on the alarm or symptom:

  1. Power Fault Detect Module circuit components, look for leaky capacitors, damaged components.
  2. Ground fault monitor circuit, inspect surface mount components, resistors and bent pins on the connectors.
  3. Circuit breaker trip circuit, pull breakers and inspect for burnt components underneath the breakers.
  4. Inspect for bent or missing pins on the connectors.
  5. Inspect all solder joints and surface mount components on the back of the PSUP PCB.

 Important: If you find a damaged component, replace the PSUP PCB, inspect the new PSUP PCB circuit components before installing.

Electrical Diagrams

PSUP Interconnect Diagram

           

PSUP (P17) to I/O PCB (P56) Detail Diagram

           

Maincon PCB (J3) to PSUP PCB (P20) Detail Diagram

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