JUMO DICON 401, Руководство по эксплуатации

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15
4 Electrical connection
4.1 Installation notes
❑
The choice of cable, the installation and the electrical connection of the in-
strument must meet the requirements of VDE 0100 “Regulations on the in-
stallation of power circuits with nominal voltages below 1000 V” or the ap-
propriate local regulations.
❑
The electrical connection must only be carried out by qualfied personnel.
❑
The instrument shall be operated by mains protected with a branch circuitry
overcurrent protection device not more than 20 Amps.
For servicing/repairing a Disconnecting Device shall be provided to discon-
nect all conductors.
❑
A current-limiting resistor interrupts the supply circuit in the event of a short
circuit. The load circuit must be fused for the maximum relay current to pre-
vent welding of the output relay contacts in the event of a short circuit.
❑
Electromagnetic compatibility conforms to the standards and regulations
specified under Technical Data.
❑
Input, output and supply lines should be run separately, not parallel to one
another.
❑
All input and output cables without connection to the mains supply must be
arranged as twisted and screened cables. Earth the screen at one end at
the instrument terminal TE.
❑
Earth the instrument at terminal TE to the earth conductor. This line must
have at least the same cross-section as the supply lines. Earth lines should
be run in a star layout to a common earth point which is connected to the
earth conductor of the supply. Do not loop the earth connections, i. e. do
not run them from one instrument to another.
❑
Do not connect any additional loads to the supply terminals of the instru-
ment.
❑
The instrument is not suitable for installation in hazardous areas.
❑
Apart from faulty installation, there is a possibility of interference or damage
of controlled processes due to incorrect settings on the controller (setpoint,
data of parameter and configuration levels, internal adjustments). Safety
devices independent of the controller, such as overpressure valves or
temperature limiters/monitors, should always be provided and should be
capable of adjustment only by specialist personnel. Please refer to the
appropriate safety regulations in this connection. Since adaptation (self-
optimisation) cannot be expected to handle all possible control loops, there
is a theoretical possibility of unstable parameter settings. The resulting
process value should therefore be monitored for its stability.
❑
The maximum permitted voltage difference between the inputs of the con-
troller and TE is 30 V AC or 50 V DC.