5.6.4 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 connection of the voltage supply of the device and the protective earth “PE” is in no
case a higher voltage permissible than the indicated line voltage of the device!
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.
5.7 Systems with residual current protective devices
Whether the use of a residual current protective device (RCD) is necessary or allowed depends on the
design of the low-voltage system on which the device is to be operated.
The assessment whether or which residual current protective device should be used is the responsi-
bility of the system operator or electrician commissioned by it.
Danger due to electric current
When selecting the tripping characteristics of the residual current protective device, the possible
residual current form of the power electronics (system with semiconductors) must be observed in
conjunction with the standards and regulations applicable at the place of use.
Design of the power electronics
•
The design of the power electronics corresponds to a frequency inverter with two-pulse bridge
circuit and PFC (power factor correction).
Information
To prevent false tripping due to pulse-like charging currents of the integrated EMC filter, we
recommend a rated differential current of 300 mA for reasons of operational reliability in the case of
fixed connection and use of a residual current protective device.
5.8 Motor protection
Integrated overload protection, preceding motor protection device unnecessary (max. line fuse see
Technical data).
5.9 Analog input “E1” for setting speed
The device has an analog input for setting the motor speed. Connection “E1” / “GND” (for further
specifications see technical data).
If the analogue input “E1” is not required for specifying the speed, this can reprogrammed as a digital
input.
Danger due to electric current
•
Ensure correct polarity!
•
Never apply line voltage to analog inputs!
Assembly instructions ECblue Electrical installation
L-BAL-F055D-GB 2021/51 Index 006 Part.-No.
21/56
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