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PRECAUTIONS
(1) Handling and installation
• Check VFD environmental conditions and electrical requirements before purchasing
VFD.
• The higher HP rated P series VFD can be heavy. Lift according to the weight of the
product. Use a hoist or crane to move and install VFD if necessary. Failure to do so may
result in personal injury or damage to the VFD.
• Do not stack VFD boxes higher than the number recommended.
• Do not place heavy items on VFD.
• Install and wire VFD according to the instructions in this manual.
• Do not open the cover during delivery.
• Do not drop VFD or subject it to hard impact.
• Verify if ground impedance is less than 100 for 230V Class VFDs and 10 for 460V
class VFDs.
• Take protective measures against ESD (Electrostatic Discharge) before touching control
boards during inspection, installation or repair.
(2) Wiring
• Input power wires should be connected to R, S and T VFD terminals for three-phase
power or R and S for a single-phase power. Power Ground and Motor Ground should
be connected to a VFD ground terminal.
• Do not connect any wires, except dynamic braking unit or DC reactor, to VFD terminals
N, P1 or P2.
• Do not connect power factor correction capacitors, surge suppressors, or RFI filter to
the VFD output.
• The phase sequence on VFD terminals U, V, W to motor will affect the direction of
motor rotation. The input power phase sequence does not affect a direction of motor
rotation.
• Incorrect VFD terminal wiring could result in VFD and/or equipment damage.
• Reversing the polarity (+/-) of the digital control terminals can damage VFD.
• Only authorized personnel familiar with CERUS VFDs should perform wiring and start-
up.
• Perform wiring after VFD installation is done. Otherwise, electric shock or bodily injury
can occur.
(3) Start-up
• Check if input power voltage is within acceptable range before applying power to VFD
• Check all the motor data and control parameters when VFD is powered. Some
parameter values might require adjustment depending on the application.
• Start VFD in forward direction and check the motor rotation. Swap any two motor
leads to change the motor rotation when VFD power is off . It is not recommended to
correct motor rotation by using reverse start command to run motor forward.
• Run motor up to full speed and check if system has resonance frequencies (vibration) in
the normal speed range. Make notes at what frequencies the vibration started and
stopped. Set these frequencies in Jump Frequency parameters to prevent a system
vibration.
• Check the motor run current on VFD display when run at full speed and if it is higher
than motor FLA, check motor wiring and for any mechanical problems (valves, dampers,
etc) that could create extra load on motor shaft. If the wiring is correct and there is no
any mechanical problem, stop VFD, change control mode from V/F to Sensorless and
run auto-tune. If the motor has different motor winding parameters of standard industrial
motor, this procedure will fix the problem.
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