Output voltage of some switch power supply can be adjusted. Before use, output
voltage must be adjusted within the above-mentioned range; otherwise, internal
circuit of the controller may be damaged.
It is recommended to use two 24V power supplies, one for supplying power to the
system, the other for supplying power to input/output terminal.
Two DC power supplies shall be isolated safely from AC power grid (switch-mode
power supply is recommended), and comply with EN60950 standard. Ensure safe
isolation and avoid electric shock.
System power supply: rated voltage 24V±10%, rated current no less than 1A.
Power supply connected to OUTPUT, INPUT terminals: rated voltage 24V±10%,
rated current no less than 1.0A (when all IO ports are in conducting state, maximum
current required is 1.0 A).
7.2 Grounding design
7.2.1 Ground classification in equipment cabinet
Ground in equipment cabinet is divided into three categories:
Signal ground: for example, signal reference in E21 controller;
Shield ground: the shield layer of communication cable can prevent the system
from external interference and hinder internal noise interfere other equipment. The
ground shield layer connected to be called shield ground must connect to protective
ground.
Protective ground: shield ground of each equipment inside the cabinet is connected
somewhere, such as grounding bar. The grounding bar connects to earth.
If signal ground and protective ground of the equipment are not directly connected
but isolated by high resistance return circuit, then this is floating ground equipment.
Floating ground equipment can isolate power interference, improve system
immunity from interference significantly and ensure reliable and stable operation.
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