Daktronics CH-1036V - Manual (Page 9)

Installation
2-3
Reference Drawing: Power Wiring and Grounding............. Drawing A-45220
The power cable must contain a separate earth-ground conductor. When a separate
ground conductor is used, do not connect neutral to ground at the disconnect or at the
display. To do so would violate electrical codes and void the warranty. Refer to the
top half of Drawing A-45220 .
2.5.2 Existing Power Installation
Reference Drawing: Power Wiring and Grounding............. Drawing A-45220
When a separate ground conductor is not available, connect the neutral to the earth-
ground at the disconnect, never at the display. Refer to the bottom half of Drawing
A-45220 .
2.6 Lightning
Protection
There is a Transient Voltage Surge suppressor (TVSS) in the entrance panel to reduce the
brief surge of high voltage that is induced into the power lines when lightning strikes in the
vicinity of the display. A varistor in the power lines to the driver logic also helps to reduce
this surge in order to protect this circuit.
There is also a relay in the signal line which disconnects the lamp driver from the incoming
signal line when the power is turned off. This will not offer protection if the power to the
display is left turned on when the display is not in use. Disconnect power when the display
is not in use!
The use of a disconnect near the display to completely cut all current-carrying lines is a very
significant step in protecting the circuits against lightning damage. It is also required by the
national Electric Code. In order for this to provide protection, the power must be
disconnected when the display is not in use.
The control console should also be disconnected from power and from the signal J-box when
the system is not being used. The same surges that may damage the display’s driver can also
damage the console’s circuit.