User’s Manual
343
section shall be more than 20mm
2
.
The ground cable of the monitor system cannot short circuit or mixed connected with the strong
alternative current cable.
For all the ground cables from the control room to the monitor system or ground cable of other
monitor devices, please use the copper resistance soft cable and its section shall be more than
4mm
2
.
The monitor system usually can adopt the one-point ground.
Please connect the ground end of 3-pin socket in the monitor system to the ground port of the
system (protection ground cable)
Appendix 7.4 The Shortcut Way to Check the Electric System by
Digital Multimeter
For 220 VAC socket, from the top to the bottom, E (ground cable), N (neutral cable), L(live cable). Please
refer to the following figure.
AC socket
There is a shortcut way to check whether the connection of these cables is standard or not (not the
accurate check).
In the following operations, the multimeter range shall be at 750 V.
For E (earth cable)
Turn the digital multimeter to 750 VAC, use your one hand to hold the metal end, and then use the
other hand to insert the pen to the E port of the socket. See the following figure. If the multimeter
shows 0, then you can see current earth cable connection is standard. If the value is more than 10, then
you can know there is inductive current and the earth cable connection is not proper.
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