lathe

[bo]

has a similar lathe that is on that side
https://madmodder.net/index.php?topic=13000.0
xmt-2335 controls if I use? P1, P2, P3 connect on mass g2 spindle control which pin 1-7 on masso g2

 

[breezy]

@bo

Bo,

You asked this question back in December 2019 and back then you were requested to supply a manual for the controller board which we are still waiting for.

Search results for query: lathe-7/

www.masso.com.au

I have now found a circuit diagram for a modern version of your speed controller and from it have determined that you CANNOT safely connect it, without damaging your MASSO.

It is not a simple case of exchanging MASSO for the potentiometer, as inside the speed controller the pot is part of a special voltage divider network that controls acceleration as well as the speed of the motor.

Regards,

Arie.

 

[zombieengineer]

@breezy

The issue of conversion of existing DC speed controllers to allow the speed to be external driven is something of a recurring subject.

I spent a couple of days trying to think of how this could be done safely, cost effectively, without loss of speed control range or linearity.

The following circuit should provide sufficient voltage isolation (the chip is good for 3kV but that is only a small part of the circuit). The circuit uses a Pulse Width Modulation (PWM) signal with a low pass RC filter to provide the equivalent pot. wiper voltage. The TLP351 has a recommended voltage supply range of 10-30V (voltage between the + and - terminals of the output side).

Hopefully the following will be of use to someone:

 

[breezy]

@bo, @zombieengineer

ZombieEngineer,

The situation is the Bo is trying to connect MASSO to a Sieg lathe, using Sherline videos as evidence that it is just plug and play, but that is not the case. The videos are for the installation of a Sherline MASSO unit which is NOT a standard MASSO, it has been modified by the addition of extra circuit boards and the software has been tweaked to compensate from the nonlinear performance of the DC motor / controller combination.

I have attached a circuit diagram for the modern version of the XMT 2335 unit. Without spending time to trace out the circuit, there is a connection between the P terminals and the AC input. Connecting MASSO to any of the P terminals will damage MASSO.

Bo,

If you want to have MASSO control the spindle speed on your lathe you will need to replace the current manual speed control unit with one that will accept 0 - 10v and TTL CW / CCW signals.

Any attempt to connect MASSO to your existing DC motor controller will destroy the MASSO.

Regards,

Arie.

 

[zombieengineer]

@breezy @bo

Breezy - fully agree you can not directly connect a Masso to this style of speed controller.

If the control board is a KB Electronics "Variable Speed DC Motor Controls for Shunt Wound and PM Motors" (datasheet) there is an isolation board (SI-5) that can be purchased from KB Electronics (installation / operation manual).

Page 8 of the manual provides details of how to jumper the board for 0-10V operation.

Page 15 of the manual has a circuit diagram of the isolation board (has an optocoupler to isolate the motor driver from the CNC controller).

Bo - The signal isolation board from KB Electronics is going to be the best solution. Designed by the same people who designed your speed controller, provides suitable isolation and should be relatively easy to install (it pushes onto the quick connectors of the existing controller board).

---

Further investigation: The SI-5 board pairs with the KBIC/KBLC controller, the SI-6 board pairs with the KBMM controller (source: page 9).

 

[bo]

which of these KBLC / KBIC uses 220V AC 24V DC PSU

 

[zombieengineer]

@bo

Is your motor controller board labelled XMT-2335?

The circuit diagram that Breezy posted was for a KBLC / KBIC controller (I believe Breezy was using it as "an example") - as a result I was confused.

I have found the circuit diagram for the XMT-2335 (see attachment) - building an interface circuit is not going to be easy. It may be cheaper to replace the DC motor controller with one that has an isolated speed control input.

What is the rating of your motor? (Voltage, Amps, number of wires to the actual motor)

There are several different variants of DC motors, one version uses a permanent magnet (2 wires) while another uses a field winding (4 wires).

The KBWS-25D motor controller can handle 220V input and a maximum motor rating of 1/2 or 1 HP (depending on motor voltage rating), has an isolated input circuit - for USD $150 to $160. The KBWS-25D is intended for permanent magnet DC motors.

I had a look for other alternatives (Dart 125 with signal isolation was USD$350) but was struggling to find something as cost effective.

 

[bo]

3 wires from the motor blue brown earthed wire TYPE 95D-1 / 350W / DC-230V / 2.2A / R.P.M 6000 CLASS E

 

[zombieengineer]

@bo

The KBWS-25D will drive that motor with a slight drop in maximum speed (maximum drive voltage is 220V compared to the 230V rating, voltage is directly proportional to speed therefore it will run at 95% of the rated speed). The KB-Electronics drivers use a plug in motor current sense resistor, for your motor rating you will need part #9836 (0.25?).

The KBWS-25D is set to 180V as shipped from the factory, this can be adjusted by changing the "Max Speed" trim-pot.

The speed signal from Masso is 0-10V while the KBWS-25D expects a 0-5V, this will require 2 resistors to create a voltage divider.

Motor driver

Plug-in Resistor