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TB152 Rev1 Inverter Control
Closing a switch between the inverter inputs for spin forward or reverse through an E stop contactor to
input common on the inverter will turn it on CW or CCW Opening the switch will turn the inverter off
The inverter controls the speed of the spindle motor by varying the frequency to the spindle motor The
maximum speed of the motor is determined by the Maximum frequency set in the inverter The inverter
will output this frequency when it receives a 10vdc signal from the analog out of the control Most inverters
are linear so that an analog signal of 2 5vdc will cause the inverter to output ΓΒΌ of the maximum frequency
to the spindle motor 5vdc = ΓΒ½ of the maximum frequency 7 5vdc = ΓΒΎ of the maximum frequenc y See
Example 1
Example 1
If the maximum frequency of the inverter is set to 100Hz the following will apply
Voltage 0v 5v 1v 1 5v 2v 2 5v 3v 3 5v 4v 4 5v 5v
Frequency 0hz 5hz 10hz 15hz 20hz 25hz 30hz 35hz 40hz 45hz 50hz
Voltage 5 5v 6v 6 5v 7v 7 5v 8v 8 5v 9v 9 5v 10v
Frequency 55hz 60hz 65hz 70hz 75hz 80hz 85hz 90hz 95hz 100hz
There is a switch on the inverter that will open or close if the inverter faults out This is connected to an
input on the PLC in the control
There is also a Reset output for the control to reset the inverter after it faults out The RESET output turns
on whenever the control receives a fault signal and an E stop signal at the same time
SPINDLE SPEED CONTROL
With the control in AUTO spindle mode
No matter what number is entered for the Maximum spindle speed on the setup screen the analog output
will be 1 0vdc when the control is commanded to spin at the maximum speed entered in setup and the
Spindle Speed Override is set to 100% If the control is commanded to spin at half of the maximum
spindle speed the analog output will be 5vdc See Example 2
Example 2
If 5000 rpm is entered for the maximum spindle speed the voltage of the analog out will be the following
when the control is commanded to the following speeds with the override set to 100%
SPEED 0 250 500 750 1000 1250 1500 1750 2000 2250 2500
VDC 0V 5v 1v 1 5 2v 2 5 3v 3 5v 4v 4 5v 5v
SPEED 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000
VDC 5 5v 6v 6 5v 7v 7 5v 8v 8 5v 9v 9 5v 10v
In MANUAL spindle mode with a UNI CONSOLE
No matter what number is entered for the Maximum spindle speed on the setup screen the analog output
will be 5vdc when the spindle is turned on with the Spindle Speed Override set to 100% For each push of
the override buttons up or down the analog out will change by + or 5v See Example 3
Example 3
OFF 100% 1 2 3 4 5 6 7 8 9
0v 5v 4 5v 4v 3 5v 3v 2 5v 2v 1 5v 1v 5v
100% +1 +2 +3 +4 +5 +6 +7 +8 +9 +10
5v 5 5v 6v 6 5v 7v 7 5v 8v 8 5v 9v 9 5v 10v
With an M39 pendant or an older console the Spindle Speed Override uses a potentiometer so that the
voltage of the analog will be from 0vdc when the spindle is off to 10vdc when the spindle is on and the
override is turned all the way up When a Spinover board or a RTK2 is used for the analog out this voltage
will be in 256 steps 4v per step With a PLCIO2 a SERVO3IO or a SPIN232 the analog out voltage will
be in 4096 steps 002v per step
SETTING UP THE CONTROL FOR MAXIMUM SPINDLE SPEED
To set up the control and inverter for the correct spindle speeds follow these directions
1 Enter in the desired maximum speed in the setup screen
2 Then following the instructions in the inverter manual set the inverter maximum frequency to 120hz
3 In MANUAL S PINDLE MODE turn the SPINDLE OVERRIDE all the way down
4 Turn the spindle on CW and make sure it is turning the correct direction If it is turning the wrong
direction correct this by turning off power and swapping 2 legs of the 3phase between the invert er and the
motor
5 Repeat step 3 and 4
6 Monitor the actual spindle speed with a tachometer and slowly increase the SPINDLE OVERRIDE until
the correct spindle speed is reached If the maximum speed cannot be reached turn the spindle off and
restart at step 2 with a higher maximum frequency
7 Write down the actual frequency that the inverter is outputting from the control panel on the front
inverter and then turn off the spindle
8 Then following the instructions in the inverter manual set the inver ter maximum frequency to the
frequency in step 7
9 Go to AUTO SPINDLE MODE; With the OVERRIDE at 100% in MDI start and run the spindle at the
lowest rpm that the spindle will normally be operated at Change the maximum frequency of the inverter
so the a ctual spindle speed is within 1 rpm at this speed
10 With a tachometer check the spindle speed across the full speed range
11 It is more critical for the spindle speed to be exact at lower speeds and it is normal for the actual
spindle speed to be corr ect at low speed and up to 50 rpm slower then the readout at the max rpm
12 If there is a multi range spindle see the operating manual for setting parameters 65 67
The PLC15 15 requires the addition of a SPINOVER board to produce the 0 Γ’ 10vdc The SPINOVER
output is an 8 BIT output that produces 0 Γ’ 10VDC in 256 Steps Parameter 31 should be set to 0
For use with a lathe or when more precise speed control is needed a SPIN232 board is used to provide
the 0 to 10V DC instead of the SPINOVER board and parameter 31 is set to a 1 for COM port 1 or a 2 for
COM port 2
The fault input is power internally by 5vdc and is triggered by pulling it down to input common 5vdc
common
RTK2 INVERTER CONNECTION
The 0 Γ’ 10VDC is an 8 BIT output that produces 0 Γ’ 10VDC in 256 Steps Parameter 31 should be set to
0
For use with a lathe or when more precise speed control is needed a SPIN232 board is used to provide
the 0 to 10VDC instead of the RTK2 and parameter 31 is set to a 1 for COM port 1 or a 2 for COM port 2
The fault input is power internally by 5vdc and is triggered by pulling it down to input common 5vdc
common
Document History
Rev1 Created on 2000 01 05 by #000