Geckodrive

GM215 STEP MOTOR DRIVE MANUAL  

This manual covers the GM215 when it's used as a conventional STP/DIR input step motor drive. Go to the GM215 MOTION CONTROLLER MANUAL if the GM215 is used as a motion controller and motor drive.  

SWITCH SETTINGS AND CONNECTOR WIRING

Figure 1

GM215 SETUP FOR MOTOR DRIVE MODE

CAUTION:

Perform the following steps with the power supply turned 'OFF' until a step says it is OK to turn the power supply 'ON'. Do not change the current set switches after setup while the motor is powered.

The following switch settings and their function only applies to the Motor Drive Mode. The same switches have completely different functions in the Motion Controller Mode.

STEP 1: SELECT MOTOR DRIVE MODE

SW1 'ON' Select step motor drive mode operation. In this mode the GM215 acts like a STEP / DIRECTION motor drive and the internal motion controller isn't used.

STEP 2: SELECT MOTOR CURRENT

Use the following chart to set the GM215 to the motor's phase current rating. If a motor has a rated current that isn't listed in the table below, set the current to the first setting that is greater than the motor's rated current.

                                                                                                                                                                                           

Figure 2

STEP 3: SELECT MOTOR SIZE

Switch 5 must be set to the motor frame size.

SW5 ‘ON’ The motor is a NEMA-23 size or smaller.

SW5 'OFF' The motor is a NEMA-34 size or larger.

STEP 4: SELECT SELF-TEST

This step is optional and it can be skipped. Self-Test can also be used after setup is completed or at any other time when it is necessary to verify the GM215 is working correctly. It can be useful when debugging a controller to GM215 interface. When finished with Self-Test, restore switches SW2, SW3, and SW4 to their previous settings to exit the Self-Test routine.

Two Self-Test routines available, Digital and Analog:

DIGITAL SELF-TEST

SW2 'ON'

SW3 'OFF'

SW4 'OFF'

In this setting, a 1.8 degree motor continuously turns 5 revolution clockwise and counter-clockwise at low, medium, and high speed.

ANALOG SELF-TEST

SW2 'OFF'

SW3 'OFF'

SW4 'OFF'

In this setting, the motor's rate of acceleration is set by TRIM3, its velocity is set by TRIM5. The motor will move 5 revolutions in either direction before reversing.

STEP 5: SELECT STEP SIZE

The GM215 can move in full-step, half-step or 10-microstep increments.

FULL-STEP

SW3 'ON'

SW4 'ON'

Every step pulse will move a 1.8 degree motor 1.8 degrees. The motor will move with 10-microstep smoothness which greatly limits low speed vibration.

HALF-STEP

SW3 'ON'

SW4 'OFF'

Every step pulse will move a 1.8 degree motor 0.9 degrees. The motor will move with 10-microstep smoothness to limit low speed vibration.

10-MICROSTEP

SW3 'OFF'

SW4 'ON'

Every step pulse will move a 1.8 degree motor 0.18 degrees. The motor will move with 320-microstep smoothness which makes the motor's motion continuous instead of step-wise even at very low speeds (less than 1 full-step per second).

STEP 6: SELECT STANDBY CURRENT REDUCTION

Standby Current Reduction is a method of reducing motor heating while a motor is idle and not moving. This is accomplished reducing motor current to 70% of the set value if this setting is enabled. The only adverse effect is the motor's holding torque is reduced to about 75% of its nominal value. If the motor has a back-driving load such as holding up a weight against gravity, this selection may not be advisable.

When enabled, the current reduction goes into effect 1 second after the last step pulse is received. The motor stays in this state until a new step pulse sent, at which time full current is restored very quickly.

SW2 'ON' enables current standby. The current is reduced while a motor is idle.

SW2 'OFF' disables current standby. An idle motor will stay at full current.

THIS COMPLETES THE SWITCH SETUP

 

CN2 CONNECTOR ASSIGNMENTS

Connector CN2 terminals 6 through 12 are unused in the Step Motor Drive mode. Terminals 1, 2 and 3 are common cathode opto-isolated inputs with 200 Ohm current limit resistors. The inputs work with 2.5V, 3.3V and 5V logic levels. Logic 1 input current is 2 mA. The output is an open collector opto-isolator that has a 10 mA current sink rating.

      Terminal            Function                  I/O

 

                1              DISABLE                   INPUT

                2              DIRECTION              INPUT

                3              STEP                        INPUT

                4              COMMON               EXTERNAL GROUND

                5              FAULT                      OUTPUT

DISABLE (TERMINAL 1)

The motor drive is ENABLED when this input is unused or has a logic 0 applied. The motor drive is DISABLED when this input has a logic 1 applied. When DISABLED, the motor current goes to zero, there is no switching activity on the motor outputs and the motor free-wheels (detent torque). The motor position is restored if no step pulses have been sent while disabled.

DIRECTION (TERMINAL 2)

The state of this input determines the direction a motor will move when a step pulse is received. The DIRECTION logic level must be stable 250ns before the active edge of the step pulse.

STEP (TERMINAL 3)

A positive edge on this input (logic 0 to logic 1) causes the motor to move one increment of motion. The minimum logic 1 time is 1 microsecond and the minimum logic 0 time is 3 microseconds.

COMMON (TERMINAL 4)

This is the ground terminal for the DISABLE, DIRECTION and STEP inputs and the FAULT output. It must go to the ground terminal of the controller that generates these inputs.

FAULT (TERMINAL 5)

This output goes to a logic 1 when the drive goes into protective shutdown because of over-voltage, over-current or over-temperature. Once the cause for the FAULT is corrected, the FAULT output can be cleared by cycling the power supply or the DISABLE input.

When finish switch setup and wiring, it is OK to turn on power supply.

END OF GM215 STEP MOTOR DRIVE MANUAL