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Question
1
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| Q
: When I use the SV motion controller to control a servomotor,
the motor is out of corol when enabling the servo-on signal. Please
explain why. |
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A
: There are several reasons that cause a motor to out of control:
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The motion controller has an incorrect setting of the encoder
direction. This produces a positive feedback loop and keeps the
motor spinning. The solution is to reverse the phase A and phase
B on the encoder
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Incorrect setting of the servo motor parameters. For example a
Panasonic servo motor, an incorrect setting of CW or CCW direction
will cause motor to out of control. The solution is to re-setting
the motion direction parameters of the servo package (driver)
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Question
2
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| Q
: When using an ISA bus motion controller under Windows, the system
always prompts "fail to open the motion controller" when
demo program is started. Why? |
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A
: This is because the communication between PC and motion controller
is not yet established. There are several causes of this problem:
- If
the device driver program for the ISA bus motion controller has
not been installed, please install the device driver.
- Turn
off the PC, check if the motion controller has proper contact
with the ISA slot.
- Check
the setting of jumpers on the motion controller. Default setting
of JP1 is on address 0X300.
- Go
to the installed directory and check the configuration and parameters
in the file "GTCmd.ini" in the DEMO folder to make sure
the motion controller has the corresponding setting.
- If
you have done the above and the motion controller card is still
not working, contact Googol Technology technical support for advice.
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Question
3
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| Q
: When I install the PCI-bus motion controller card, the system
always indicates that "cannot find the device driver". |
| A
: This may be caused by the hardware defect of the motion controller
card. Please contact Googol Technology technical support for services. |
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Question
4
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| Q
: I am using a PCI-bus motion controller card under Windows 2000.
The device driver has been installed successfully and the motion controller
card works fine. However when I restart the PC and run the demo, the
PC indicates that the PCI device cannot be found and fail to open
PCI device. |
| A
: This indicates that the motion controller card, though is used,
is not running properly. Please check the Windows device manager to
see if interrupt of the motion controller card is same as other PCI
devices. If so, please plug the motion controller card in another
PCI slot until the interrupts are different. |
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Question
5
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Q
: I am controlling a stepping motor. But the motor rotates in
the same direction regardless the command is for CW or CCW.
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| A
: A motion controller controls stepping motor in two modes - CW/CCW
pulse train output mode and pulse train with direction signal output
mode. The incorrect setting of control output mode may cause this
problem. Please try to change the setting to another control mode. |
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Question
6
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| Q:
When
an ISA bus motion controller card is inserted, the PC cannot be started. |
| A
: This may be due to motion controller hardware defect, please
contact Googol Technology technical support for services. |
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Question
7
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| Q
: Why would the interpolation coordinate and value of speed collected
has a sudden change sometime? |
| A
: This is caused by the communication between PC and motion controller
card. It does not mean the actual pulse sent to the motor is suddenly
changed. Yet if the user requires this data for logic judgment, such
as soft limit, then it is necessary to filter the false signal during
the sampling. For example, when judging the soft limit, the user can
get the coordinate data twice and judge whether the continuously sampled
coordinates over travel the soft limit. |
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Question
8
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| Q
: The erratic motion is caused when issue GT_StpMtn, the stop
motion command in buffer, during executing the command GT_MVXY, the
positioning to the start point of the command in buffer. Why? |
| A
: This caused by the characteristics of the motion controller.
In developing the control program, avoid issuing the stop motion command
during the execution of positioning command in buffer. |
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Question
9
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| Q
: I am using Windows and a PCI-bus card. Why the status and position
data acquired in the process of motion were not correct? |
| A
: To allow interrupt under Windows, Googol Technology has embedded
the interrupt in the drive program. When an interrupt is generated,
and the application has not processed the interrupt accordingly, the
drive program will automatically set the axis that has generated the
interrupt as the current axis, and clear the interrupt indication.
So when initializing the PCI-bus card, follow the initialization procedures
in the user manual, and set the value of the interrupt mask register
of each axis as "0". |
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Question
10
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| Q
: After
sending the speed, acceleration and position data, the position data
value jumps to target value, while the speed parameter is set at 100
pulse/ST and the position parameter is set at 1000 pulses. |
| A
: The speed parameter was set too high and the position parameter
too small. In this specific case, it only takes some ten control cycles
to arrive the target position. The speed and acceleration settings
of Googol motion controller card are in terms of number of pulses
per control cycle, and the default control cycle is 200 £gs (or 400
£gs). Please read the user manual before setting the parameters about
speed and acceleration. |
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Question
11
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| Q
: The LED on the terminal board is not lit. |
| A
: The fuse on the card is burnt out. Replace it with the spare
fuse shipped with the motion controller. When the motion controller
is in use, do not plug or unplug the controller and terminal board.
If you need to buy the fuse, please choose very fast-acting type fuse
with ampere range 2Aand static resistance less than 1 ohm. |
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Question
12
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| Q
: If I am using GT-400-SG, and my driver does not have an alarm
signal, could I leave it open? |
| A
: Yes, however you need to connect Pin 1 and Pin 2 of CN5(CN6,
CN7, CN8) on the terminal board. |
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Question
13
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| Q:
When I run the demo program on GT-400-SG--PCI-S, the "fail
to open device" message is shown. Why? |
| A
: In
the installed directory, open the configuration file"GTCmd.ini"
in the DEMO folder, set the base address=65535, then save the file.
Re-run the Demo program. |
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Question
14
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| Q
: I am using GT motion controller to control a steeping motor.
When executing multiple segments continuous linear or circular interpolations,
the machine is vibrating and the finished path is not smooth enough,
especially at the intersection point between two paths.
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| A
:
This problem is caused by the characteristics of stepping motor. When
there is a significant change in speed in a short period of time,
the stepping motor may lose steps or stall. To handle this situation,
motion controller has a specific solution. The user should add GT_SetAccLmt()
function in the initialization process. Also adjust the setting of
acceleration limit. The problem should be solved. |
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Question
15
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| Q
: I am using your PC104 bus motion controller. During the development,
we use ISA bus to develop and test. It works fine. But when using
a PC104 module IPC as its host PC, the motor will keep on rotating.
Why? |
| A
: Please check CN5 on the motion controller is connected with
a proper power supply. |
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Question
16
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| Q
: In the commands executing in buffer, do the GT_SetSynVel() and
GT_SetSynAcc() have segment numbers? |
| A
: No. Only the linear and circular interpolation commands have
segment number in those commands executing in buffer. |
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Question
17
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| Q
: I am running multi-threaded program under Windows. Why will
the motion controller provide incorrect value?
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| A
: When using multi-threaded program, be careful not to send multiple
commands simultaneously. GT motion controller is a single-threaded
programming device, it will produce error when receiving two or more
commands simultaneously. |
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Question
18
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| Q
: I am using GT-SV motion control card, and find the INDEX signal
cannot be captured. I have used oscilloscope to check that the signal
has been sent. But the bit to indicate the INDEX signal captured in
the status register has not been set. |
| A
: GT motion controller has bandwidth requirement on INDEX signal:
its bandwidth must be greater than the bandwidth of phase A signal
of the encoder. If the INDEX signal does not satisfy this requirement,
there is a problem that the signal may not be captured. In this case,
contact Googol Technology technical support. |
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Question
19
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| Q
: I am using GT motion controller card with a linear encoder,
and the linear encoder outputs single-ended signal as feedback signal.
It works fine in the laboratory but in the field: the reading from
the linear encoder is drifting when the motor is still stall. |
| A
: This is caused by the interference in the field. Please contact
Googol Technology technical support to help. |
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Question
20
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Q
: When I insert a motion controller card into the PCI(or ISA)
slot of the PC, the communication
is abnormal. I found that the bracket of the card is so high that
the gold finger of the card
can't well contact with the slot of the PC. How shall I do? |
| A
: By loosening the fix screw between the bracket and the motion controller card with a spanner,
the bracket height can be adjusted to a proper position. |
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