62755EN 414 Servo Alarm

ALARM 414 (DIGITAL SERVO SYSTEM IS ABNORMAL)

Points

Check details by CNC’s diagnostic function and LED display on the servo amplifier.

1)

2) LED display on the servo amplifier

3)

•  When DGN200 shows

“1”

• #6(LV):    Low voltage alarm      ® LED [2] or [3]lights
• #5(OVC): Over current alarm
• #4(HCA):  Abnormal current alarm    ‹ LED [8] lights
• #3(HVA): Overcurrent alarm      ‹ LED [1] lights
• #2(DCA):Discharge alarm          ‹LED[4]or[5]lights
• #1(FBA): Disconnection alarm
• #0(OFA): Overflow alarm

• #6(LV): Insufficient voltage alarm

1) Servo amp LED [2] turns on (control power shortage)

2) Servo amp LED [3] turns on (DC power shortage)

•  #5(OVC): Over current detection by software

• #4(HCA): Abnormal current alarm (Servo amp. LED:[8] lights)

• #3(HVA): Over voltage alarm (Servoamp.LED [1] lights)

DC voltage in servo amp. is excessive.

• #2(DCA): Discharge alarm

1 Servo amp LED 4 lights (discharge control circuit is abnormal)

2 Servo amp LED 5 lights (discharge circuit overheat)

• #1(FBA): DISCONNECTION ALARM

Position detection signal line is disconnected or short–circuited.

NOTE

This alarm is related with full–closed system.

• Causes

1. Signal cable is disconnected or short–circuited.
2. Serial pulse coder or position detector is faulty Refer to Notes1.
3. Main CPU board or option 2 boardis Refer to Notes 2.

CAUTION

1. After the pulse coder is replaced, reference position or machine’s standard position is different from former one. Adjust and set itcorrectly.
2. When the main CPU board is replaced, all the data stored in memory is lost. Set NC data again, referring to chapter3 “input/output ofdata”.

From 1st axis to 4th axis are main CPU board. 5th axis or later are option 2 board.

• #0(OFA): Overflow alarm

causes

1. Wrong setting of servo parameters1800s.
2. Main CPU (1axis to 4 axes) or option 2 board (5 axes or more)

CAUTION

When the main CPU board is replaced, all the data stored in memory is lost. Set NC data again, referring to chapter 3 “input/output ofdata”.

When 1 is displayed at DGN 204

#6(OFS): A/D converter used for current feedback in the digital servo is abnormal.

#5(MCC): Contacts of electromagnetic contactor in the servo amp. is blown.®LED 7 lights.

Serial pulse coder C is an incremental pulse coder.

• #6(OFS): A/D converter is abnormal

Main CPU board or option 2 board is faulty

When the main CPU board is replaced, all the data stored in memory is lost.

Set NC data again, referring to chapter 3 “input/output of data”.

• #5(MCC): Contacts of electro–magnetic contactor is blown within servo amp.

• LED display

NOTE

1st axis is L, 2nd axis is M.

• LVDC alarm

When the electro–magnetic contactor is turned on in the servo amp. or DC voltage for the main circuit becomes low, this LED is lit.
Causes are;

1. Input voltage is in sufficient.
2. Contacts of electro–magnetic contactor in servo amp. is
3. Power circuit in servo amp. is abnormal.

• DCSW alarm

This alarm is lit when the transistor for regenerative discharging turns on more than 1 second.
Its causes are;

1. Multifunction of servo amplifier such as regeneratived is charge circuit.
2. Regenerative discharge energy is excessive due to cutting conditions.

• DCOH alarm

This alarm is lit when regenerative discharge resistance is overheated and the thermostat operates.

Its causes are;

1. Average discharge energy is excessive due to frequent acc./dec.orno use of balancer in vertical axis
2. Function in go father most at in the powertrans former when thermost at signal TH1 and TH2 are connected.

• MCC alarm

When turning on MCC, if the contacts are already on.

• Check terminals on servo amp.

When you open the cover of the terminal board, you can see the check terminal below LED.

• Terminal name and meaning

• Current/volt

• Current waveform

Content Credit: FANUC Product Manual