Operating In It-System; Residual-Current-Operated Protective Device; Motor Protection; Operation With 100 % Speed / Alternatively Speed Control By Specification Signal - Siemens SIMOTICS 1PH818 Série Instructions De Service Et De Montage

Assembly instructions ECblue
5.4.3

Operating in IT-System

Danger due to electric current
•
In the IT-System the neutral point of voltage supply is not grounded; in the case of a short-circuit
between a phase (e.g. "L1") and protective earth "PE" becomes the protective earth potential =
phase.
•
Between the mains connection of the device and the protective earth "PE" is in no case a higher
voltage permissible than the indicated line voltage of the device!
For 1 ~ fan types
1 ~ types can be used in IT-System in standard version. These may only be used in 3 ~ IT-Systems if
no higher voltage to the "PE" can occur than the specified mains voltage of the device even in case of
a fault to earth of a mains phase which is not used by the device (of none of the two power supplies).
In order to ensure a trouble free operation in IT-System the "GND" potential of the control ports have
to be connected with the protective earth potential.
As a consequence of these connection must be considered for the control ports (exception floating
relay contacts):
1. Connection only with wires, suitable for mains voltage and surrounding area.
2. Connection with suitable isolated amplifiers only.
5.5

Residual-current-operated protective device

Danger due to electric current
To ensure as high a degree of reliability as possible we recommend a release current of 300 mA,
where a residual current circuit breaker (type A) is used.
Residual current circuit breaker (type A)
Exception: All-current-sensitive fault current circuit breaker on the 3 ~ 230 V line
When connecting the device between two outer conductors, "all-current-sensitive" fault current circuit
breakers must be used (
5.6

Motor protection

Integrated overload protection, preceding motor protection device unnecessary (max. prefusing
Technical details).
5.7 Operation with 100 % speed / alternatively speed control by specification signal
In the as-delivered state operation with 100 % speed
After switching on the mains voltage and a run-up time of approx. 20 seconds the fan is operated
constantly with 100 % speed (reference speed). For this function a bridge is installed at the factory on
the terminal block between the analogue input "E1" and the power supply "10 V" (specification signal
10 V specification 100 % speed).
Speed control via setting signal
If necessary, a speed specification between 50 and 100 % of the specified reference speed is possible
via the analogue input (specification signal 0...10 V
For this, remove the factory-installed bridge between "E1" and "10 V", connection of specification
signal to "E1" / "GND" (R
Danger due to electric current
•
Ensure correct polarity!
•
Never apply line voltage to analog inputs!
L-BAL-F065-GB 1617 Index 004
EN 50 178, Art. 5.2).
Technical data).
i
Part.-No. 00702801-GB
17/28
specification 50..100 % speed).
Electrical installation
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