Siemens SENTRON PAC4220 Manual page 47

Note
Only qualified personnel are permitted to install, commission or service this device.
• Wear the prescribed protective clothing. Observe the general equipment regulations and
safety regulations for working with high-voltage installations (e.g. DIN VDE, NFPA 70E as well
as national or international regulations).
• The limits given in the technical data must not be exceeded even during commissioning or
testing.
• The secondary connections of intermediate current transformers must be short-circuited at
the transformers before the power supply lines to the device are interrupted.
• Check the polarity and the phase assignment of the instrument transformers.
• Before connecting the device, check that the system voltage matches the voltage specified
on the rating plate.
• Before you start commissioning the device, check that all connections are correct.
• Before power is applied to the device for the first time, it must have been located in the
operating area for at least 2 hours in order to reach temperature balance and avoid humidity
and condensation.
• Condensation on the device is not permissible during operation.
Note
Integration into a system
Responsibility for the safety of the system into which the PAC4220 is integrated lies with the
person setting up the system.
Note
Grounding of current transformers optional
Always connect the transformers and ground them on the secondary side in accordance with the
applicable regulations. Grounding of the current transformers on the secondary side is not
necessary for use in low-voltage switchboards for performing measuring tasks.
Note
Prevent capacitive and inductive interference
Make sure that all data and signal lines are routed separately from control and power supply
lines. In order to avoid the risk of capacitive and inductive interference, these cables must never
be routed in parallel.
PAC4220
Equipment Manual, L1V30827278B-01
Connection
4.1 Safety information
45