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G201 STEP MOTOR DRIVE
REV 16: August 6, 2009
The power supply voltage must be between 24 VDC and 80 VDC. The maximum power supply current required is 67% of the
motor’s rated phase current. An unregulated power supply may be used as long as the voltage stays between the limits; keep the
ripple voltage to 10% or less for best results. The drive has a 2 second power-on reset time before the motor is energized.
CAUTION Power supply voltage in excess of 80 VDC will damage the G201.
If the power supply is more than 1 foot (300 mm) away from the G201, a 470uF capacitor must be connected across the G201’s
power supply terminals. Keep the capacitor lead length to 1 inch (25 mm) or less.
CAUTION Never put a switch on the DC side of the power supply! This will damage, if not destroy, your drive!
The choice of power supply voltage depends on the high speed performance required of the motor; doubling the voltage doubles
the motor’s high speed power. In all cases the power supply voltage should be no less than 4 times or no more than 25 times the
motor’s rated voltage. The motor may not run as smoothly as possible if the power supply voltage is less than 4 times the motor’s
rated voltage. A power supply voltage greater than 25 times the motor’s rated voltage will overheat and damage the motor, even if
it is not turning. Motor winding inductance should be 500uH or greater, but generally no more than 7mH.
A more accurate calculation of power supply voltage is to find your motor’s inductance, and put it into the following equation.
32 * (√mH inductance) = Power Supply Voltage
If your motor has 2mH of inductance, the equation would look as follows.
32 * (√2) = 45.12V
MOTOR CONNECTION
TERMINAL 3 Phase A
Connect one motor winding to this terminal
TERMINAL 4 Phase /A
Connect the other end of the winding to this terminal
TERMINAL 5 Phase
Connect the other motor winding to this terminal
TERMINAL 6 Phase /
Connect the other end of the winding to this terminal
Connect one motor winding to terminals 3 and 4. Connect the other winding to terminals 5 and 6. Turn the power supply off when
connecting or disconnecting the motor. If the motor turns in the wrong direction, reverse the motor winding connections to
terminals 3 and 4.
CAUTION Do not short the motor leads to each other or to ground; damage will result to the G201.
4-wire, 6-wire and 8-wire motor may be used. When 6-wire motors are used, they may be connected in half winding or full
winding. This is equivalent to an 8-wire motor connected in parallel or series. If a motor is connected in series or full winding, the
motor’s phase current rating is half of its parallel or unipolar rating. The choice depends on the high-speed performance required;
a parallel-connected motor will provide twice the power of a series-connected motor at the same power supply voltage.
DISABLE PIN
TERMINAL 7 Disable
This terminal will force the winding currents to zero when shorted to ground (TERMINAL 12).
Shorting this input to ground (term. 7 to 12) forces winding currents to zero and stops all output switching activity. The G201 will
continue totalizing step and direction inputs if any are sent. The power supply current drops to less than 15mA. The motor will
return to its original position when the disable input is released if no step pulses have been sent and the motor has not been
moved more than 2 full steps.
STEP AND DIRECTION INPUTS
TERMINAL 8 Direction
