Franklin Electric Cerus X-Drive, Installation And Operation Manual

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INSTALLATION PLANNING
16
Basic VFD Configuration
The following table includes the most commonly used devices in a motor control branch operated by a VFD.
Adequate peripheral devices and correct connections are essential for proper VFD operation.
AC Power Source Use single- or three-phase power source with voltage within the per -
missible range of VFD input power rating.
MCCB, Fuses, or Franklin Electric
Manual Motor Starters
Select circuit breakers or fuses in accordance with NEC and applicable
local codes.
Inline Magnetic Contactor Do not use input power contactor for frequent starting and stopping the
VFD, otherwise VFD power components can be damaged.
AC Line Reactor or Harmonic Filter A line reactor provides some degree of surge protection and decreases a
level of harmonic distortion in the power line. It is recommended when
power source kVA rating is more than 10 times higher than VFD rating.
A Harmonic filter provides a higher level of harmonic mitigation. Inte -
grated DC Chokes are included in VFD models larger than Frame C,
equivalent to a 3% AC line reactor.
EMI/RFI Filter Install an EMI/RFI filter to decrease VFD Electromagnetic and Radio Fre -
quency Interference with operation of sensitive electronic equipment.
Variable Frequency Drive Install VFD with proper orientation, ventilation, spacing etc. according to
the requirements described in this manual with all necessary protective
and filtering devices to provide long and reliable VFD operation.
AC Load Reactor or Output Filter
(460 V and higher)
Install a load (output) reactor or an output filter to protect motor wind -
ings if distance from VFD to a motor is in the range 45-100 feet. Install
output dV/dt filter for a range of 100-1000 feet (800 feet for submers -
ible pumps), or a sine wave filter for greater distances.
Three Phase AC Induction Motors or
Permanent Magnet Motors, includ -
ing Franklin Electric pump motors
The X-Series VFD is not compatible with servomotors.
Opening the motor circuit by disconnect or contactor during VFD run
can damage VFD power components.
Risk of damage to VFD
,
or malfunction can occur.
• Do not install a magnetic contactor or motor disconnect in the motor circuit for start/stop or emer -
gency stop purpose. Opening the motor circuit while the VFD is running may cause VFD failure.