Mounting and connecting the device
3.3 Connecting the device
SIMATIC IPC677D
42
Operating Instructions, 09/2014, A5E32995420-AC
Procedure
1. Make sure that the ON/OFF switch is in the posi-
tion "0" (OFF) to prevent unintentional startup of
the device when it is connected to the 24 V power
supply.
2. Switch off the external 24 V DC power supply.
3. Connect the 24 VDC plug connector to the device.
Observe the correct polarity of the contacts:
①
DC 24 V
②
ground
③
protective conductor
4. If necessary, install the enclosed cable grip.
5. Secure the 24 VDC cable to the cable grip using a
cable tie.
Note
Reverse-polarity protection
The DC power supply (24V) has a mechanism to protect against reverse polarity. In the
event that the 24 VDC lines are reversed (24 VDC nominal (-20% / +20%) and connected to
ground, the device will not be damaged. The device will simply fail to turn on. After the power
supply has been connected correctly, the device will again be ready to operate.
See also