Xylem IM167 R8 Aquavar CPC (Centrifugal Pump Control) - Manual (Page 19)

19
Supply Connection
Disconnecting Device (Mains)
Install a hand-operated input disconnecting device between the AC power source (MCC) and
the drive. The disconnecting device must be of a type that can be locked to the open position
for installation and maintenance work. Follow all local NEC codes.
Fuses
See Technical Data: Fuse Sizing/Rating on pages 133 and 134.
Thermal Overload and Short-circuit Protection
The drive protects itself and the input and motor cables against thermal overload when the
cables are dimensioned according to the nominal current of the drive. No additional thermal
protection devices are needed.
WARNING! If the drive is connected to multiple motors, a separate thermal overload
switch or a circuit breaker must be used for protecting each cable and motor. These
devices may require a separate fuse to cut off the short-circuit current.
The drive protects the motor cable and the motor in a short-circuit situation when the motor
cable is dimensioned according to the nominal current of the drive.
Mains Cable (AC line cable) Short-circuit Protection
Always protect the input cable with fuses. Standard gG (US: T or L) very fast acting, fuses
will protect the input cable in short-circuit situations and prevent damage to adjoining
equipment in case of a short-circuit inside the drive.
Size the fuses according to local safety regulations, appropriate input voltage and the rated
current of the drive. For fuse ratings, see Technical Data, pages 133 and 134.
WARNING! Circuit breakers are not capable of providing sufficient protection
because they are inherently slower than fuses. Always use fuses with circuit breakers, if
you are not sure of the circuit braking capacity and mains short circuit power.
Ground Fault Protection
The drive is equipped with an internal ground fault protective function to protect the unit
against ground faults in the motor and the motor cable. This is not a personal safety or a fire
protection feature. The ground fault protective function can be disabled with a parameter
contact factory for more information.
The EMC filter of the drive includes capacitors connected between the main circuit and the
frame. These capacitors and long motor cables increase the ground leakage current and may
cause fault current circuit breakers to function.
Emergency Off Devices
For safety reasons, install the emergency off devices at each operator control station and at other
operating stations where emergency off may be needed. Pressing the stop key on the control
panel of the drive does not generate an emergency off of the motor or separate the drive from
dangerous potential.
INSTALLATION
(Frames R1-R6)