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Keep the device far away from radio stations, radar, and high-frequency devices working at high
current.
Use electromagnetic shielding when necessary.
Lightning Protection
By design, a U200 series device is lightning protective, but excessive lightning may still damage the
device. To protect the device better, follow these guidelines:
Ensure the PGND cable of the chassis is well grounded.
Ensure the earth point of the power socket is securely connected to the earth ground.
Install a lightning arrester at the input end of the power supply to enhance the lightning protection
capability of the power supply.
To enhance lightning protection, install a special lightning arrester at the input end of outdoor signal
lines to which interface modules of the device are connected.
For how to connect the PGND cable and install a power lightning arrester or signal lightning arrester,
refer to Chapter 4 "Installing the U200 Series Device."
Workbench Requirements
When installing the device on a workbench, make sure that:
The workbench is sturdy enough to support the weight of the device and installation accessories.
The workbench is well grounded.
Rack-Mounting Requirements
When installing the device in a rack, follow these guidelines:
Install the device in an open rack if possible. If you install the device in a closed cabinet, make sure
that the cabinet has a good ventilation system.
Make sure that the rack is sturdy enough to support the weight of the device and installation
accessories.
Make sure that the size of the rack is appropriate for the device, and that there is enough clearance
around the left and right panels of the device for heat dissipation.
For the sake of heat dissipation and device maintenance, it is recommended that the front and rear
of the rack be at least 0.8 m (31.50 in.) away from walls or other devices, and that the headroom in
the equipment room should be no less than 3 m (9.84 ft.).
Safety Precautions
Safety Signs
When reading this manual, pay attention to the following:
3-4
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