Siemens 1PH818, Operating Instructions & Installation Instructions

Page: 181 / 198

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 speci fi ed 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
fl oating
relay contacts):
1. Connection only with wires, suitable for mains voltage and surrounding area.
2. Connection with suitable isolated ampli
fi ers 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 ( EN 50 178, Art. 5.2).
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 speci fi cation 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 ” (speci fi cation signal
10 V speci fi cation 100 % speed).
Speed control via setting signal
If necessary, a speed speci fi cation between 50 and 100 % of the speci fi ed reference speed is possible
via the analogue input (speci fi cation signal 0...10 V speci fi cation 50..100 % speed).
For this, remove the factory-installed bridge between “ E1 ” and “ 10 V ” , connection of speci fi cation
signal to “ E1 ” / “ GND ” (R
i
Technical data).
Danger due to electric current
•
Ensure correct polarity!
•
Never apply line voltage to analog inputs!
Assembly instructions ECblue Electrical installation
L-BAL-F065-GB 1617 Index 004 Part.-No. 00702801-GB
17/28
181