Installation and connection
4.4 Switch on and test the HMI device
TP 270, OP 270, MP 270B (WinCC flexible)
4-18 Operating Instructions, Edition 03/2004, 6AV6691-1DD01-0AB0
Notice
Damage
The force of the screwdriver on the screws may cause the socket for the plug-in terminal
block in the HMI device to be levered up from the printed circuit board.
Therefore, only connect the wires when the terminal block has been unplugged.
Connecting the power supply
Please refer to Technical Data for information on the power supply requirements.
Caution
Ensure safe electrical insulation of the power supply. Use only power supply units complying
with IEC 364)-4)-41 or HD 384.04.41 (VDE 0100, Part 410).
Only use power supply units which comply to SELV (Safety Extra Low Voltage) and PELV
(Protective Extra Low Voltage) standards.
The supply voltage must be within the specified voltage range. Voltages outside this range
may cause malfunctions in the HMI device.
If the power supply for the HMI device is not grounded, the communication interface could
be destroyed by the potential difference between the HMI device and CPU.
Therefore, connect the 24 V output of the power supply to the potential equalization.
See also
Technical data (Page 12-5)
4.4 Switch on and test the HMI device
Start up
Proceed as follows:
1. Disconnect all connections to external units and remove any cards from the slots.
2. Connect the HMI device to the power supply.
3. Switch on the power supply.
If the HMI device does not start, the connections are probably reversed. In this case,
switch of the power supply, reverse the connections and switch the power supply on
again.
4. When the HMI device has started, connect the configuration computer or other peripheral
equipment to it.
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