Ground fault protection
The drive is equipped with an internal software that protect the motor and the drive against input and
output unbalanced currents. For further information, see Programming and Software Manual.
This function is not intended to protect people against direct or indirect contacts or against fire, so an
external protection must be provided to ensure that a substantial ground fault current is promptly
interrupted. The SD750 drives are suitable to operate with RCD components Type B, if it is required.
The EMC / EMC filters and motor cable lengths increase the earth leakage currents, so the protection
range is set according to the installation conditions. For additional information, contact Power
Electronics.
Motor thermal protection
The drive includes a motor thermal protection based on the motor performance parameters which
mathematically calculates the remaining heating capacity in the motor. When this reservoir is reduced
below the limits, this is, the motor temperature approaches the maximum, the drive automatically stops
the motor. For further information consult the Software and Programming Manual.
The drive includes as standard a PTC connection that permits monitor the motor temperature. Once
connected and configured, the drive could either stop the motor or generate a warning signal.
Other Protections
Apart from the protections mentioned above, the drive implements additional protections such as
Temporary loss of power, automatic re-start, high and low input and output voltage, overload or
underload of the pump, etc. For further information, consult the Software and Programming Manual.
Safety Stop Function – STO (Safe Torque Off)
The Safety Stop Function allows the drive’s output to be disabled so that the drive cannot provide
power or generate torque in the motor.
The Safe Torque Off function complies with EN ISO 13849-1 PLd and EN 61508 SIL3 (EN60204-1,
stop category 0). This feature is standard and allows you to comply with current safety standards. For
more information see section “STO - Safe Torque Off”.
IT Grids – Floating Earth drives
When planning an IT grid electrical installation select the drive for floating earth operation. Check the
drive reference and make sure that the drive is suitable for this type of installations.
IT grids must be equipped with an insulation monitoring system. To adjust the parameters consider that
the drive has a very high impedance even if there is a large number of equipment working in parallel in
the same IT network.
It is recommended the installation of lightning rods to ground in order to protect against transient
overvoltages. The lightning rod must have a rated voltage greater than the drive rated voltage for the
purpose of preventing its operation during normal conditions.
To Next Page
Loading...