Hitachi Kokusai Electric Inc. SL24G-US-02 Manuel D’Utilisation

7. Appendix

7-5

Abnormal

operations

Symptoms

Cause and Resolution

Wireless circuit disconnects

sometimes

Check whether there are any power source abnormalities such as power supply

noise or a drop in the power supply voltage.

Shake the mounting pole to see if it is strong enough. If the mounting pole

sways, wireless communication will be unstable.

It is possible that it is being affected by multipath fading.

Change the installation location or increase the ground height to mount this

product in a place where the problem occurs less frequently.

Wireless circuit receive errors

are occurring frequently

Check whether the direction of the antenna has moved.

It is possible that an interference wave is being received. Restart the master and

check whether it switches to another channel.

There may be an error in the wireless settings.

When the output power is set at a fixed value, receive errors will occur more

easily due to attenuation from rain if the value is too much smaller than the

appropriate value for your installation environment.

If you set the automatic distance switching to a fixed long distance, it may

disconnect if the output power for short distance does not reduce to a value that

is appropriate for the installation environment.

Make sure that there is no trash on the antenna.

Since the characteristics can be degraded if there is snow on the antenna,

remove any snow.

When the wireless disconnects, check to see if there is any obstruction

interrupting the wireless link.

Shake the mounting pole to see if it is strong enough. If the mounting pole

sways, wireless communication will be unstable.

It is possible that it is being affected by multipath fading.

Change the installation location or increase the ground height to mount this

product in a place where the problem occurs less frequently.

Check for problems in the installation environment.

Check whether there are any alarms between this device and the opposed

device.

Wireless link speed is slow

If the setting for the wireless link speed for the master has been changed from

the default value, it will not be any faster than the set wireless link speed.

Check whether the direction of the antenna has moved.

Make sure that there is no trash on the antenna.

Since the characteristics can be degraded if there is snow on the antenna,

remove any snow.

Check whether the link distance is appropriate.

If the link is longer than the appropriate distance, it might be slow due to

attenuation from rain.

Check that the installation environment has any problem, such as that there is an

obstruction between this point and the opposed device.