Dalsa Linea HS Series, Руководство пользователя

Страница: 71 / 74

Appendix B: Trouble Shooting Guide

71
The greater the speed variation, the lower the target speed needs to be to avoid over-speed
conditions. If the speed variation can be reduced by eliminating the backlash in the transport
mechanism and / or optimizing the motor controller characteristics, then a higher target speed will
be achievable.
Distorted Image when Slowing Down Changing Direction
The camera must align the rows in a fashion that accurately follows the object motion.
When the scan direction changes, then the process must reverse to match the reversed image
motion across the sensor.
Only when all rows being accumulated have received the same image will the output be correct.
Prior to this some lines have been exposed to one direction and other lines exposed to the opposite
direction in the accumulated output.
Power Supply Issues
For safe and reliable operation, the camera input supply must be +12 V to +24 V DC.
The power supply to the camera should be suitably current limited, as per the applied input
voltage.
Assume a worst case power consumption of +24 W and a 150% current rating for the breaker or
fuse.
Note that the camera will not start to draw current until the input supply is above approximately
10.5 V and 200 msec has elapsed. If the power supply stabilizes in less than 200 msec, then inrush
current will not exceed normal operating current.
It is important to consider how much voltage loss occurs in the power supply cabling to the
camera, particularly if the power cable is long and the supply is operating at +12 V where the
current draw is highest.
Reading the input supply voltage as measured by the camera will give an indication of the supply
drop being experienced.
The camera tolerates “hot” unplugging and plugging.
The camera has been designed to protect against accidental application of an incorrect input
supply, up to reasonable limits.
With the following input power issues, the status LED will be OFF:
 The camera will protect against the application of voltages above approxi28 V. If
the overvoltage protection threshold is exceeded, then power is turned off to the camera’s
internal circuitry. The power supply must be recycled to recover camera operation. The
input protection circuitry is rated up to an absolute maximum of +30 V. Beyond this
voltage, the camera may be damaged.
 The camera will also protect against the accidental application of a reverse input supply up
to a maximum of -30 V. Beyond this voltage, the camera may be damaged.