Connection To Power Supply - KSB UPA Installation & Operating Manual

44 of 98
5 Installation at Site
Maximum operating frequency
▪ For an asynchronous motor: Do not exceed the maximum operating frequency of
50 Hz or 60 Hz respectively.
▪ For a synchronous motor: Do not exceed the maximum operating frequency of
100 Hz.
Maximum permissible rate of voltage rise and peak voltages
Observe the following limits:
Table 18: Limit values
Maximum rate of voltage rise:
Maximum peak voltages to earth:
NOTE
Fit an output filter to ensure the limits are observed.
In the case of UMA-S 150, UMA-S 200 and UMA-S 250 submersible motors, the
output filter must be rated for 100 Hz.

5.7 Connection to power supply

DANGER
Electrical connection work by unqualified personnel
Danger of death from electric shock!
▷ Always have the electrical connections installed by a trained and qualified
electrician.
▷ Observe regulations IEC 60364 .
DANGER
Uncontrolled backflow of the fluid handled turning the magnet rotor in the UMA-
S 150, UMA-S 200 and UMA-S 250 submersible motor
The rotating permanent magnet rotor may generate an electric current at the
motor lead ends!
Danger of death from electric shock!
▷ Take suitable precautions to prevent any inadvertent rotation caused by
uncontrolled backflow of the fluid handled.
▷ Make sure the motor cannot be rotated inadvertently.
▷ Observe the safety regulations that apply to work involving electrical hazards.
Verify that the equipment is de-energised.
DANGER
Electrical equipment overloaded by uncontrolled rotation of the magnet rotor of a
UMA-S 150, UMA-S 200 or UMA-S 250 submersible motor
Danger of death from electric shock!
▷ Take suitable precautions to prevent any inadvertent motor rotation caused by
uncontrolled backflow of the fluid handled.
▷ As an option, provide electrical protection devices between the motor and the
frequency inverter, such as fuses or circuit breakers.
UPA / UPA S
Limit value
dv/dt ≤ 500 V/μs
J1 insulation ≤ 600 V
J2 insulation ≤ 800 V