CU-EMA+
4.3 Electrical connections
All connection lines can be fed into the device through the cable glands at the bottom.
Include strain relief for the connection cables. The supply line cross-sections must be suitable for the rated current and meet
local regulations.
The signal and supply lines of the device must be properly connected.
Please note the clamping points of the following cable glands:
Thread
Clamping range
M25
11.0mm – 17.0mm
M20
6.0mm – 12.0mm
Run the lines so the insulation will not be damaged. If necessary, secure the lines with suitable means and avoid excess line
lengths.
The power supply must be connected as per chapter
[> page 9] or per the wiring diagrams.
The power and voltage supply for the components may require the following separators:
RCD, main switch and circuit breaker or fuses
If applicable, the following requirements must be met for operation:
– The RCD must shut off the load within the prescribed period (200 ms at 115 VAC, 40 ms at 230 VAC). It must be suitable for the
maximum load.
– The main switch must be installed near the device, easy to access and marked as a separator.
– The circuit breaker/fuses protect all supply lines but not the earth conductor.
The fuses should be arranged side by side, have the same rating/characteristic, and not be connected to the neutral wire of
multi-phase equipment.
[> page 30] for the applicable separator data.
DANGER
Electric voltage
Risk of electric shock
a) Always disconnect the unit from the mains before working on it. After shutting off
the power, allow a discharge time of at least 5 seconds.
b) Secure the device from accidental restarting.
c) The unit may only be opened by trained, competent personnel.
d) Ensure the correct voltages supply.
DANGER
Potential equalisation
Connect the system’s potential equalisation to the potential equalisation on site. Stray
electric currents may not flow through this connection.
WARNING
Hazardous electrical voltage
The device must be installed by trained staff only.
WARNING
Electric voltage
Insulation test will damage the device
Do not test the electric strength if the entire unit is under high voltage!
CAUTION
Wrong mains voltage
Wrong mains voltage may damage the device.
Regard the correct mains voltage as given on the type plate.
8
Bühler Technologies GmbH
BE440029 ◦ 10/2020
