Operating instructions

Mounting and connecting

4.3 Connecting the HMI device

MP 377, MP 377 PRO (WinCC flexible)

66 Operating Instructions, 10/2008, 6AV6691-1DR01-0AB0

Connecting the mains terminal

NOTICE

Damage

Do not tighten the screws of the power supply terminal if it is plugged into the HMI device.

The pressure from the screwdriver may otherwise damage the HMI device socket.

Only connect the wires when the mains terminal is withdrawn.

*1'

9'&

Connect the power supply terminal to the cables of the power supply as shown in the figure

above. Ensure that the lines are connected properly to the correct terminals. Refer to the

label for the contact pins on the rear of the HMI device.

Reverse polarity protection

The HMI device is equipped with a reverse polarity protection circuit.

Connecting the power supply

CAUTION

Safe electrical isolation

Use only 24 VDC power supply units with safe electrical isolation in accordance with

IEC 60364-4-41 or HD 384.04.41 (VDE 0100, Part 410), e.g. to PELV standard.

The supply voltage must be within the specified voltage range. Otherwise, malfunction at

the HMI device cannot be ruled out.

Applies to non-isolated plant configurations:

Connect the GND 24 V connection from the 24 V power supply output to equipotential

bonding for uniform reference potential. You should always select a central point

of termination.