Check for ROM not properly installed or incorrect ROM. Possible defective PCB. AL- 0. 1 The internal motor temperature is higher than the rating. Input power open phase.
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For 1. 5 Control it is Parameter 3. Bit 0, 1 and 2. Detects that switch is set for 2. VAC when incoming voltage is 2. AL- 0. 9 The temperature of the main circuit heat sink has risen abnormally. Check for fan and/or ventilation problem. AL- 1. 0 Low input voltage. Detects drop in input power.
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AL- 1. 1 Over voltage in DC Link. Detects abnormally high DC power supply voltage. AL- 1. 2 Excessive current flowed in the DC Link, the main circuit power module (IPM) detected an error. The IGBT, IPM or the PCB may be defective. Check the model- specific parameter settings. AL- 1. 3 The memory inside the CPU is abnormal.
The PCB is probably defective. AL- 1. 5 A sequence of switching operations was incorrect during speed range switching control or spindle switching control. Check the contactor used for power line switching and in particular the auxilary contact. AL- 1. 6 The RAM is abnormal. This check is made when power is switched on. Check the connection of the power to the PCB, the current detection circuit may be defective, the A/D converter may be defective.
In either case the PCB must be replaced. AL- 2. 0 Same as for AL- 1. V phase. AL- 2. 4 The serial communication data between the CNC and Spindle Amplifier is abnormal. This alarm is normal when the NC power is off. AL- 2. 5 Serial communication between the CNC and Spindle Amplifier stopped. Check same as above. AL- 2. 6 The C's contouring control speed detection signal (detector on the motor side) is abnormal.
For 1. 5 control it is 3. Bit 5 and for 1. Bit 5. AL- 2. 7 Position Coder signal error. The position coder or it's cable may be defective, signal may be too low (adjust level), feedback cable may not be shielded properly, the detection circuit may be defective. The C's contouring parameter setting may be incorrectly.
It is 6. 50. 1. 2 For 1. For 1. 6/1. 8 it is 4. AL- 2. 8 The C's contouring control speed detection signal (detector on the spindle side) is abnormal.
Normally 3. 0 seconds set by parameter. Motor is overloaded, check the load meter, cutting conditions and tool. AL- 3. 0 Input Circuit Over current. Over current flowing in input circuit. Check incoming power for over voltage condition.
Possibly bad Power Supply. AL- 3. 1 The motor cannot rotate at the specified speed. It rotates at a very low speed or stops. Check if the motor is physically locked, check if the speed feedback cable is defective, check the speed feedback signal with an oscilloscope, check the power connections.
AL- 3. 2 The memory in the serial communication LSI chip is abnormal. The LSI chip is probably defective, replace the PCB. AL- 3. 3 Insufficient DC Link section charging. Detects insufficient charging of DC power supply voltage in power circuit section when magnetic contactor in amplifier is turned on.
Check for open phase or defective charging resistor. AL- 3. 4 A Parameter setting is invalid, check parameters. AL- 3. 5 The value set in the gear ratio data parameter is greater than the limit allowed in the internal processing.
Spindle to Motor Gear Ratio Parameter 6. For 1. 5 controller it is 3. For 1. 6/1. 8 control it is 4. AL- 3. 6 The error counter overflowed. Check if the values set in the gear ratio and position gain parameters are too large.
Check parameters above as well as 6. Position gain during orientation), 6. Position gain during servo mode/synchronization control of the spindle), 6.
Position gain during C's contouring control). Check that the speed detector parameter, 6. Check that the Accel/Decel duration parameter, 6. AL- 3. 9 The C's contouring control one rotation signal has not been detected correctly.
Check that the feedback signal level is sufficient and that the shield is properly grounded. Check that the parameter used to specify the use of the C contouring control detector, 6. PCB may be defective. AL- 4. 1 The position coder one rotation signal was not detected correctly. Check parameter 6. Setting for Differential Speed Mode Functions).
AL- 4. 4 An A/D Converter error occurred. A/D Converter is probably defective, replace the PCB.
AL- 4. 6 The position coder signal was not detected correctly during thread cutting. The differential speed is calculated by multiplying the main spindle motor speed by the gear ratio. Make sure that the calculation does not exceed the maximum motor speed. AL- 5. 0 During the synchronization control of the spindle, the calculation result for the speed command exceeded the limit. The motor speed command is calculated by multiplying the spindle speed command by the gear ratio. Make sure that the calculation result does not exceed the maximum motor speed.
AL- 5. 1 Under voltage at DC Link section. Detects that DC power supply voltage of power circuit has dropped.
AL- 5. 2 ITP signal abnormality 1. Detects abnormality in synchronization signal (ITP signal) with CNC. AL- 5. 3 ITP signal abnormality 2. The ITP signal (Sync Signal for Sync With the CNC) stopped. CNC error, check the operation of the CNC. Serial communication LSI chip may be defective.
If so, replace the PCB. AL- 5. 4 It was detected that a high current flowed in the motor for a long period. Motor is overloaded or accel/decel is too frequent.
Check the load meter for overloading. Check if accel/decel was repeated very frequently. Check cutting conditions. AL- 5. 5 During spindle switching control or speed range switching control, there was a conflict between the switch request signal (SPSL or RSL) and the power line state confirmation signal (MCFN, MFNHG, or RCH, RCHHG). Switching unit (magnetic contactor for power line switching) may be defective.
Make sure the Parameters for the power line state signals related to the spindle switch control and output switch control are set correctly. The cooling fan is probably defective. AL- 5. 7 Control circuit is erroneous. Check connections and incoming AC. The Spindle Amplifier is probably defective. For 1. 6/1. 8 its 4.
Bit 0, 1 and 2. 0- C Control Power Supply Alarms as Displayed on Power Supply: 0. The main circuit power module (IPM) has detected and error.(PSM - 5. Over current flows into the input of the main circuit.(PSM - 1. The IGBT (or IPM) is defective, replace.
The specification of the AC Reactor does not match the Power Supply Module. Check the PSM and the specification of the AC Reactor. A cooling fan for the control circuit has stopped. Check cooling fan and proper ventilation of unit. Also check for overloading of the system. In the main circuit, the DC voltage (DC Link) has dropped. The input power may be too low.
Check the specification of the PSM. The DC Link may be shorted. Check the connections.
The recharge current limiting resistor may be defective. Check the wiring board.
The input power supply is abnormal (Open phase). In the main circuit, the DC voltage at the DC Link is abnormally high.
The regenerated power may be excessive. In this case, regeneration is impossible, the PSM does not have the capacity. The output impedance of the AC power source may be too high. Check the output impedance. The regeneration circuit may have failed.
Check whether there is an Over voltage at check terminal IR or IS. May be necessary to replace wiring board or PCB. The IGBT (or IPM) may be defective.
If a machining center will not allow you to move any of the axes in MDI or PROGRAM unless the spindle is running, you can change Parameter 2. SCTO) to 0. This tells the NC not to check for the Spindle Speed Reached Signal. The 9. 00 series parameters on the O control are for Optional Parameters. If a control indicates Alarm 4. Serial Servo Alarm for X,Y,Z) at the same time, the Memory is probably scrambled.
Once scrambled, it must be cleared by cycling power and holding the Reset button. Remember to try this first without holding the Delete button to avoid clearing the Programs until it is absolutely necessary. If you must clear the entire memory, backup the programs and offsets first. To do this you may have to cycle the power while holding the Reset button. Then, enter the 9. Parameters by hand, cycle power normally, enter the communication parameters by hand (1.
Then backup up programs and offsets, then clear the whole memory by cycling the power while holding the Reset and Delete buttons. Anytime the memory is cleared, no matter what method you will use to re- enter the parameters, you should enter the 9. When entering the 9. Alarm telling you to cycle power.
You should cycle power each time this happens rather than waiting until all 9. You will also receive alarms when loading the 9. You have no choice but to continue on. If you do not so me of the 9. Normally, after losing the memory you will have Servo alarms which will prevent you from loading the parameters with a PC.
These alarms are generated because when the memory is lost the Motor Model I. D. The alarm results because zero is not a valid Motor I. D. Load the 9. 00 parameters by hand. Enter the motor model I.
D. Make Parameter 8. Now the Digital Servo Parameter alarms should go away and you should be able to load the rest of the parameters with the PC. If you want to reload the parameters by RS2. EOB button with INPUT. Any time you are loading the parameters by hand it is helpful to set P6. Parameter page to the Alarm page every time the 0.