JUMO meroTRON 104 Manual Breve página 59

3 Electrical connection
3.1 Installation notes
Requirements for personnel
• Work on the device must only be carried out to the extent described and, like the electrical connec-
tion, only by qualified personnel.
• Before plugging and unplugging connecting cables, it must be ensured that the acting person is elec-
trostatically discharged (by touching grounded metallic parts, for example).
Cables, shielding, and grounding
• When selecting the electrical wiring material as well as when installing and connecting the device
electrically, comply with the requirements of DIN VDE 0100 "Low-voltage electrical installations" and
the applicable country-specific regulations (for example, based on IEC 60364).
• It may be necessary to adhere to special notes relating to the heat resistance of cables (see connec-
tion diagram).
• Route input, output, and supply lines separately and not parallel to one another.
• Only use shielded and twisted probe and interface cables. Do not route the lines close to current-
carrying components or cables.
• For temperature probes, ground the shielding on one side in the control cabinet.
• Do not perform loopthroughs on the grounding cables, but instead route the cables individually to a
shared grounding point in the control cabinet; in doing so, ensure that the cables are as short as pos-
sible.
Ensure that the potential equalization is correct.
Electrical safety
• The device is intended to be installed in control cabinets or plants. Ensure that the customer's fuse
protection does not exceed 20 A. Disconnect the device from the mains voltage on all poles prior to
starting service or repair work.
• The relay's load circuit can be operated with a hazardous electrical voltage (e.g. 230 V). De-energize
the load circuit during mounting/dismounting and electrical connection.
• To prevent the relay contacts being destroyed in the case of an external short-circuit in the load cir-
cuit, the latter must be fuse-protected as per the maximum admissible relay current (see technical
data).
• The device is not suitable for installation in potentially explosive areas.
• In addition to a faulty installation, incorrectly set values on the device can also impair the correct func-
tion of the downstream process. Therefore, ensure that safety devices independent of the device,
e.g., overpressure valves or temperature limiters/monitors, are present and that it is only possible for
qualified personnel to define settings. Please observe the corresponding safety regulations in this
context.
References to other information
• The electromagnetic compatibility conforms to the standards and regulations cited in the technical
data.
• In general, please observe the specifications regarding electrical isolation.
Setup interface
• The setup interface (USB) is not intended for a permanent connection. Always disconnect the USB
cable from the device as soon as you have finished working with the setup program.
3 Electrical connection
17