Flood Coolant... how to wire it?

[lcvette]

Good thoughts.... Any suggestions on what to do for powering the relays?

[SCzEngrgGroup]

Good thoughts.... Any suggestions on what to do for powering the relays?

Just get a separate 12V supply, or whatever is required. A $5 wall wart should do the job. E-Bay is your friend.

Regards,
Ray L.

[neilw20]

Chris, Don't try and run your coolant relay as you propose.
Us the NO VOLTAGE FREE contacts on either 'pin16' or Pin'1' on the right hand lower corner of the C11G.

Be very careful trying to control the motor speed.

It is quite worrying to see one side of your field connection going to C11 board.

Do it all manually, quite separate to the C11 board until you have a good understanding of the dangerous, mains referenced potentials on the motor drive board. THERE IS NO ISOLATION, so you have + and - 160VDC available to fry both you and the C11 PCB.

As for solid tapping, you have many hurdles to jump before that is possible. It is not trivial.

[john-100]

just to add to Neils reply

only the C11G analogue is isolated from the printer port
provided the 12V DC supply is only connected to the C11G board
X1 power connector

John

[neilw20]

Not only is 0-10v isolated, but safe creapage distances for 240vAC is 6mm, and I have a C11G board to look at. 3mm for 110v.

It will not give SAFE isolation, even though it is isolated.
I would rate the isolation at 100v absolute safe maximum. Not suitable for 240vAC type isolation.

Is the power supply rate for the proper isolation? An unearthed plug pack is often much safer than a good looking power supply.

Believe me, as I have been engineering this sort of stuff for 40 years and seen it all (well enough of it to know what is unsafe).
You can't use a C11G to give that sort of isolation. The isolation is intended only to prevent earth loops and noise for control signals.

[john-100]

Hi Neil ,

you are correct
you have the advantage of having a C11 board to look at

with only 3mm spacing the board is only safe in the US

for the UK and Australia etc
I'd want a minimum of 8 mm spacing between the live speed control circuit and the rest of the board

John

[neilw20]

Hi Neil ,

you are correct
you have the advantage of having a C11 board to look at

with only 3mm spacing the board is only safe in the US

for the UK and Australia etc
I'd want a minimum of 8 mm spacing between the live speed control circuit and the rest of the board

John

8mm is nice.
Regulations is 6mm. Standard 0.3" opto. I always put a slot under the device (or relay), as an airgap.

This will replace a C11G and meet the regulations on our new machine.

Sneak preview . Not released yet.
http://www.toolmach.com.au/page18.html

[john-100]

Hi Neil ,

the boards look good to me ,

High quality boards and with the information you need printed on the top
you don't need the book for simple tests

with all the status led's and blown fuse indicators it should be childs play fault finding on the machine

I guess a lot of hard work has gone into the design

a nice linear power supply without the leakage currents of switch mode designs

its too easy to get a shock off double insulated switch mode power supplies that pass the tests .

the mains filter currents are un balanced when one side of the mains supply is connected to earth

John

[lcvette]

found the diagram on cnc4pc's site that showed the lead connected to the F terminal, is that possibly incorrect? Maybe itshold go somewhere else?

[john-100]

Hi Chris ,

since your motor has a field winding and not a permanent magnet
I'd connect the wire to the smaller terminal I2

-F1 and I2 are both connected to the negative terminal of the bridge rectifier
but the way see it is
because of the small resistance at the connection to the -F1 terminal
a small voltage (due the field current ) would be added to the speed control signal if they are connected to the same terminal


John

[neilw20]

Hi Chris,

I hope you can keep the smoke in.

[lcvette]

ok, from the manual i found this tid bit, not sure what it means or which the C11G is but I will begin trying to identify that to make a clear determination of which method is viable and correct:

6.6 Voltage Following Connection – An isolated 0 - 9 Volt DC analog
signal input can be used to control motor speed in lieu of the
Main Speed Potentiometer. The control output voltage will linearly
follow the analog signal input. The signal input must be isolated
from the AC line. Connect the signal input positive lead (+) to
Terminal “P2” and the negative lead (-) to Terminal “P1”, as
shown in Figure 4. The source impedance of the signal input
should be 10 kΩ or less. The MAX Trimpot is not operational in
voltage following mode. Use the MIN trimpot to set an initial value
of input signal. If necessary, use auxiliary trimpots to scale and/or
limit the input voltage.

CAUTION! Do not earth ground any input terminals.
Notes: 1. If an isolated signal input is not available, or if using a
4 - 20 mA DC signal input, install the optional plug-on SI-6 Signal
Isolator (Part No. 9444). This will also allow direct connections to
process controllers and microprocessors. 2. If multiple follower
motors are to be controlled from a single lead motor or a single
Main Speed Potentiometer, install the optional KBSI-240D Signal
Isolator (Part No. 9431). 3. Terminal “F-” may be used in lieu of Terminal “P1”.