G203V Power supply and resistor

[Mooser]

Before I buy the wrong one...
I've got 2 G203V and a C11G BOB
I've got 2 steppers, both 8 wire, I think I'll run both in parallel mode which says that one will be
2.1v, 7.0A/phase and 1.6mH/Phase
while the other is
1.9v, 5.0A/phase and 1.65 mH/Phase
When I work out the voltage I'm getting
32 x sqrt(1.6) = 40.4
32 x sqrt(1.65) = 41.1
so around 40-42v (or should I go a little higher?)
7A + 5A = 12A X .66 = 8Amps
Maybe want to add another stepper later, probably another smaller one, 5A one so safe to say 7+5+5 = 17 X .66 = 11.25 Amps

So a 40V 11A supply should do it, if I can't find one, stay as close to the 40V (or lower) but ok to got higher on the amps ????

Or am I way off base here?
Thanks
Mooser

[Crevice Reamer]

Originally Posted by Mooser Before I buy the wrong one... I've got 2 G203V and a C11G BOB I've got 2 steppers, both 8 wire, I think I'll run both in parallel mode which says that one will be 2.1v, 7.0A/phase and 1.6mH/Phase while the other is 1.9v, 5.0A/phase and 1.65 mH/Phase When I work out the voltage I'm getting 32 x sqrt(1.6) = 40.4 32 x sqrt(1.65) = 41.1 so around 40-42v (or should I go a little higher?) 7A + 5A = 12A X .66 = 8Amps Maybe want to add another stepper later, probably another smaller one, 5A one so safe to say 7+5+5 = 17 X .66 = 11.25 Amps So a 40V 11A supply should do it, if I can't find one, stay as close to the 40V (or lower) but ok to got higher on the amps ????

You are correct, except you don't want to go over 41V. The 7A motor will need NO current resistor. The 5A motor will need a 117.5 K Ohm resistor. BOTH drives will need to be heat sinked.

(TERM. 11) CURRENT SET Connect the current set resistor to this terminal (TERM. 12) CURRENT SET Connect the other end of the current set resistor to this terminal This input matches the G203V’s current output to the motor windings. The G203V will accommodate motor winding currents from 0 to 7A. Use the following equation to calculate the value, (in kilo-Ohms) of the current set resistor: R (in kilo-ohms) = 47 * I / (7 – I) Use the nearest standard value 5% tolerance, 1/4W resistor for this setting. Here are the current set resistor values for motor current in .5A increments. Round the appropriate answer to the nearest 5% resistor value. a. 1A – 7.8K b. 1.5A – 12.8K c. 2A – 18.8K d. 2.5A – 26.1K e. 3A – 35.25K f. 3.5A – 47K g. 4A – 62.67K h. 4.5A – 84.6K i. 5A – 117.5K j. 5.5A – 172.33K k. 6A – 282K l. 6.5A – 611K m. 7A – OPEN OTHER CONSIDERATIONS: HEATSINKING: The G203V needs heatsinking for current settings greater than 3 amps. The case temperature (measured on the bottom plate) should not exceed 70 degrees C, and for best life should be kept at 50C degrees or less. Use heatsink compound between the G203V and your heatsink.

CR.