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G201 STEP MOTOR DRIVE
REV 16: August 6, 2009
(2) REDUCED CURRENT RANGE: In addition to the normal current range (1A to 7A), the G201 can also operate over a reduced
current range (0.3A to 2A). This range is used for motor phase currents of less than 1A. Auto current reduction is not available for
this reduced current range.
(3) NEMA-42 MOTOR: Use this option if the drive is to be used with NEMA-42 frame size motors. This option adjusts the mid-
band compensation circuit for optimum performance with this size motor.
(4) MID-BAND COMPENSATION DISABLE: Some step pulse sources generate very “ragged” timing. If the pulse-to-pulse period
varies by more than +/-30%, the drive may have problems counting that step pulse. This option disables the mid-band
compensation circuit, making the drive insensitive to this timing restriction. As a consequence, the motor may exhibit mid-band
instability problems.
ADJUST: This trimpot adjusts the motor for the smoothest possible low-speed operation. Set the motor speed to about 1/4
revolution per second, and then turn the trimpot until a distinct null is noted in the motor’s vibration. This will result in the most
even microstep placement for a given motor and power supply voltage.
CONVERTING THE G201 TO A G210
The G201 can be converted to a G210 by installing the G901 step pulse multiplier board. Remove the cover of the drive, and then
use a small pair of needle-nose pliers to remove the opto-isolator from its socket. Plug the G901 board into this socket and
replace the cover.
REMOVING AND REPLACING THE COVER:
The STEP PULSE MULTIPLIER and the INPUT OPTION settings are jumpered internally. It is necessary to remove the cover of
the drive to change these settings from their default values. Please follow the steps below on how to remove and replace the
cover to avoid damaging the drive:
REMOVING THE COVER:
1) Remove the two 2-56 phillips-head screws on the bottom of the drive.
2) Gently lift the back of the cover upward until the LED clears the rectangular hole
3) Slide the cover backwards while still lifting until it clears the drive.
REPLACING THE COVER:
1) Make sure the LED is vertical relative to the drive printed circuit board.
2) Slide the cover forward over the drive while lifting the back of the cover.
OPTION JUMPER BLOCK
OPTOISOLATOR SOCKET
1 2
5 6
STANDBY ENABLED
STANDBY DISABLED
LOW CURRENT RANGE
1 2 3 4
5 6 7 8
1 2
5 6
3
7
4
8
SIZE 42 MOTOR
MID-BAND DISABLED
8
NORMAL (DEFAULT)
7
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