Additional Protection - Grundfos TPE 1000 Series Installation And Operating Instructions Manual

Mains connection, three-phase motors
Related information
27.1 Supply voltage

7.4 Additional protection

DANGER
Electric shock
Death or serious personal injury
‐
Only use residual-current circuit
breakers (ELCB, GFCI, RCD) of type
B.
The residual-current circuit breaker must be marked
with the following symbol:
The total leakage current of all the electrical
equipment in the installation must be taken into
account. You find the leakage current of the motor in
the sections on leakage current and leakage current
(AC).
This product can cause a direct current in the
protective earth conductor.
Overvoltage and undervoltage protection
Overvoltage and undervoltage may occur in case of
unstable power supply or a faulty installation. The
motor is stopped if the voltage falls outside the
permissible voltage range. The motor restarts
automatically when the voltage is again within the
permissible voltage range. Therefore, no additional
protection relay is required.
12
L3
L2
L1
PE
The motor is protected against transients
from the power supply according to EN
61800-3. In areas with high lightning
intensity, we recommend external lightning
protection.
Overload protection
If the upper load limit is exceeded, the motor
automatically compensates for this by reducing the
speed and stops if the overload condition persists.
The motor remains stopped for a set period. After this
period, the motor automatically attempts to restart.
The overload protection prevents damage to the
motor. Consequently, no additional motor protection is
required.
Overtemperature protection
The electronic unit has a built-in temperature sensor
as an additional protection. When the temperature
rises above a certain level, the motor automatically
compensates for this by reducing the speed and
stops if the temperature keeps rising. The motor
remains stopped for a set period. After this period, the
motor automatically attempts to restart.
Protection against phase unbalance
Three-phase motors must be connected to a power
supply with a quality corresponding to IEC 60146-1-1,
class C, to ensure correct motor operation at phase
unbalance. This also ensures long life of the
components.
Related information
26.2 Leakage current
27.2 Leakage current, AC