System alarms

The 950 PMC SYSTEM ALARM can be caused by a problem with the I/O, particularly if an external voltage is applied to the I/O system.


The 911 RAM PARITY ERROR alarm may mean that the Memory board has failed but it may also mean simply that the parameters have been lost due to a bad battery. The only way to find out is to do a memory clear. Turn the NC off, hold the RESET and the DELETE button, turn the NC back on while holding both buttons. If the alarm goes away and is replaced with servo alarms, etc. then the Memory board is probably ok. At this point you must follow the procedures for bringing back a brain dead control. If the CRT is flashing BAT, go ahead and install new batteries before you start.


910
MAIN RAM PARITY
The RAM parity is related to low order bytes. Replace the memory PC board.

911
MAIN RAM PARITY
This RAM parity error is related to high order bytes. Replace the memory PC board.

912
SHARED RAM PARITY
This parity error is related to low order bytes of RAM shared with the digital servo circuit. Replace the axis control PC board.

913
SHARED RAM PARITY
This parity error is related to high order bytes of RAM shared with the digital servo circuit. Replace the axis control PC board.

914
SERVO RAM PARITY
This is a local RAM parity error in the digital servo circuit. Replace the axis control PC board.

915
LADDER EDITING CASSETTE RAM PARITY
This RAM parity error is related to low order bytes of the ladder editing cassette. Replace the cassette.

916
LADDER EDITING CASSETTE RAM PARITY
This RAM parity error is related to high order bytes of the ladder editing cassette. Replace the ladder editing cassette.

920
WATCHDOG ALARM
This is a watchdog timer alarm or a servo system alarm for axes 1-4. Replace the axis or master control PCB.

921
SUB CPU WATCHDOG ALARM
This a watchdog timer alarm related to the sub CPU board or a servo system alarm for axis 5 or 6. Replace the sub CPU board or the axis 5/6 control PCB.

922
7/8 AXIS SERVO SYSTEM ALARM
This is a servo system alarm related to axis 7 or 8. Replace the axis 7/8 control PCB.

930
CPU ERROR
This is a CPU error. Replace the master PCB.

940
PC BOARD INSTALLATION ERROR
PC board installation is incorrect. Check the specification of the PC board.

941
MEMORY PCB CONNECTION ERROR
The memory PCB is not connected correctly. Check that the PCB is connected securely.

945
SERIAL SPINDLE COMMUNICATION ERROR
The hardware configuration is incorrect for the serial spindle or a communication alarm occurred. Check the hardware configuration of the spindle. Also, check that the hardware for the serial spindle is connected securely.

946
SECOND SERIAL SPINDLE COMMUNICATION ERROR
Communication is impossible with the second serial spindle. Check that the second serial spindle is connected securely.

950
FUSE BLOWN ALARM
a fuse has blown. Replace the fuse (+24E F14).

960
SUB CPU ERROR
This is a sub CPU error. Replace the CPU PCB.

998
ROM PARITY
This is a ROM parity error. Replace the ROM board in which the error occurred.

Generally speaking, anytime you have Parity alarms or most any 900 series alarm the first step required is normally to clear out the memory by holding the RESET and DELETE buttons while turning on the NC power. This will delete all parameters and programs.


Alarms 910 to 914 (RAM PARITY ERROR) will occur if the RAM chips are removed and replaced even with the power off because of the battery back-up.

Alarm 950 FUSE BREAK (+24E:FX14) means that F14 the 5.0 amp fuse is blown. This is the bottom fuse on the front of the Power Unit. It’s labeled +24E.


1000
EXTERNAL ALARM
This alarm was detected by the PMC ladder program. Refer to the relevant manual from the machine builder for details.

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