bandit controller retrofit
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26 Mar 2025 15:36 #324977
by Masiwood123
Replied by Masiwood123 on topic bandit controller retrofit
that I know that the drivers are not expensive, or in that case I would have to install other motors, because there is no driver for such motors with an unknown type and with 8 wires.
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26 Mar 2025 15:50 #324980
by Masiwood123
Replied by Masiwood123 on topic bandit controller retrofit
that's right, on my market you can find a cheap servo set from 1 kw motor + driver for 200 euros., I have to check first if it has backlash , I mean ballscrews
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26 Mar 2025 15:52 #324982
by Masiwood123
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26 Mar 2025 16:01 #324984
by Masiwood123
Replied by Masiwood123 on topic bandit controller retrofit
thank you very much for the answer, but I really don't understand how to check it, I only know in the case when drivers , old amps` are appeared with an analog input +-10v. Yes ,that this is probably a signal ribbon cable from controller board to driver.
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27 Mar 2025 21:27 #325107
by PCW
Replied by PCW on topic bandit controller retrofit
Those are step motor drives, 8A max
No idea how they are interfaced but
maybe worth a bit more searching with
the drive PN:
214 072 01d
No idea how they are interfaced but
maybe worth a bit more searching with
the drive PN:
214 072 01d
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27 Mar 2025 22:45 #325119
by PCW
Replied by PCW on topic bandit controller retrofit
Here's a thread of someone else doing a similar retrofit:
www.cnczone.com/forums/uncategorised-met...253-engineering.html
The existing drives are 2 phase, unipolar, and 8A
(Unipolar is why they have 6 motor wires because each winding has a center tap)
I think the forum suggestion is good: Replace the drives with standard bipolar
stepper drives but since the windings are wired in series for a bipolar connection,
use the highest voltage capable drive you can get.
(this assumes you want to keep the motors)
www.cnczone.com/forums/uncategorised-met...253-engineering.html
The existing drives are 2 phase, unipolar, and 8A
(Unipolar is why they have 6 motor wires because each winding has a center tap)
I think the forum suggestion is good: Replace the drives with standard bipolar
stepper drives but since the windings are wired in series for a bipolar connection,
use the highest voltage capable drive you can get.
(this assumes you want to keep the motors)
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28 Mar 2025 00:09 #325127
by PCW
Replied by PCW on topic bandit controller retrofit
They are 2 winding type, that's not in question.
There are 6 connections because unipolar drives need
windings with a center-tap. You would ignore the center tap
when using a bipolar drive (series connection).
Note that when using this series connection you would
lower the drive current (so say 4 A instead of 8A)
There are 6 connections because unipolar drives need
windings with a center-tap. You would ignore the center tap
when using a bipolar drive (series connection).
Note that when using this series connection you would
lower the drive current (so say 4 A instead of 8A)
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28 Mar 2025 15:01 #325165
by tommylight
There are also 3 phase and 5 phase stepper motors, Vexta had some nice videos explaining all the types and versions on youtube.
Replied by tommylight on topic bandit controller retrofit
They always are 8 wire inside, they all have 4 windings inside, they all have 50 magnetic de-tents inside, making it 200 steps per revolution. There are same types with 400 steps per revolution, meaning 0.9 degree per step instead of the usual 1.8 degree per step.I know they are 6-wire, but perhaps they are 8-wire internally.
There are also 3 phase and 5 phase stepper motors, Vexta had some nice videos explaining all the types and versions on youtube.
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28 Mar 2025 19:46 #325183
by Masiwood123
Replied by Masiwood123 on topic bandit controller retrofit
thank you guys, you helped me a lot, I realized that these are in fact stepper drivers and motors, the voltage is 45vdc, I will buy a simple stepper driver and try to connect phases a,a+,b,b+ and according to my understanding ``com'' I should short-circuit two pairs (wires) of aCOM and bCOM separately
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28 Mar 2025 20:06 - 28 Mar 2025 20:07 #325188
by tommylight
Replied by tommylight on topic bandit controller retrofit
Do NOT use the COM motor wires on new drives!!!
Do NOT use 5 wire stepper motors with new drives!!!
New drives are always "bipolar" meaning each winding has it's own H-bridge.
Old drives were "unipolar" meaning each winding was driven by a single transistor/MOSFET to ground, while all 4 pins from one side of all 4 windings was wired to + (positive) of the power supply.
Use a DVM in OHM or BEEP mode to find out what wires belong to the same winding, and based on resistance you can also figure out the middle wire, see bellow:
-if you want max torque but lower rotation speed, use the two wires with most resistance, in your case use A1/A2 and B1/B2 and leave ACOM/BCOM unconnected. Do isolate them so they do not touch.
-if you want more speed at lower torque, use the middle wire and 1 of the remaining 2 wires, it does not matter which one, just one.
Do NOT use 5 wire stepper motors with new drives!!!
New drives are always "bipolar" meaning each winding has it's own H-bridge.
Old drives were "unipolar" meaning each winding was driven by a single transistor/MOSFET to ground, while all 4 pins from one side of all 4 windings was wired to + (positive) of the power supply.
Use a DVM in OHM or BEEP mode to find out what wires belong to the same winding, and based on resistance you can also figure out the middle wire, see bellow:
-if you want max torque but lower rotation speed, use the two wires with most resistance, in your case use A1/A2 and B1/B2 and leave ACOM/BCOM unconnected. Do isolate them so they do not touch.
-if you want more speed at lower torque, use the middle wire and 1 of the remaining 2 wires, it does not matter which one, just one.
Last edit: 28 Mar 2025 20:07 by tommylight. Reason: more info
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