iv
(4)
Operation
•
When the Auto restart function is selected, VFD can restart multiple times automatically
during operation.
•
The Stop key on the keypad can only be used to stop VFD when Local control is
enabled. Install a separate emergency stop circuit if necessary.
•
If restart after fault reset is selected, the VFD can start automatically after fault reset.
•
Do not modify VFD internal components and circuits.
•
Set correct motor data from the motor nameplate and overload protection parameters
for proper motor overload protection.
•
The use of any disconnecting device (contactor, disconnect etc.) in motor circuit during
VFD run can cause a damage of VFD power components. Stop VFD before opening the
motor circuit with disconnect or contactor.
•
Install line reactor or harmonics filter to reduce harmonics distortion and EMI/RFI filter
for electromagnetic and high frequency interference to sensitive electronic equipment.
•
Install a line reactor if input power is unbalanced or distance from VFD to power
transformer is greater than 45 feet to increase VFD protection from transient power
surges.
•
Power factor capacitors and generators may become overheated and damaged due to
harmonics distortion created by VFD.
•
Use, if possible, an inverter rated motor or motor with insulation class “F” or higher. The
VFD generates high frequency output pulses with spikes, which can deteriorate motor
winding insulation and eventually damage the motor. The longer distance to the motor
the higher amplitude of these voltage spikes will be applied to motor winding. Any
cables with paralleled wires will increase the amplitude of these spikes at motor
terminals.
•
Install output reactor to protect motor winding insulation in 380-480V applications if
distance from VFD to the motor is greater than 45 feet or if motor is old or insulation
class is lower than “F”. Install output filter in the same application if distance is greater
than 100 feet.
•
Install output filter to protect motor winding insulation in 200-230V applications if
distance from VFD to the motor is greater than 200 feet.
•
Use dynamic braking unit and resistor in high inertia applications when VFD trips on
Overvoltage during deceleration if short deceleration time is required.
•
VFD can operate motor at frequency higher than 50HZ or 60Hz. Verify the maximum
allowed speed with motor and machinery manufacturers prior to increasing a VFD
output frequency because it can overheat motor or damage machinery.
•
The DC-Braking mode produces an extra motor braking force but does not provide a
holding torque.
(5)
Safety
•
If required, provide an emergency mechanical brake to prevent any hazardous
conditions when VFD fails during operation.
•
Some VFD parameters are set as default to automatically start VFD in some
applications. Disable these parameters if automatic start is not safe for personnel or
equipment.
(6)
Maintenance, inspection and parts replacement
•
Disconnect all motor leads from VFD before checking the motor insulation with Megger
tester. The Megger tester 1000VDC output can damage the VFD power components.
•
Refer to Chapter 8 for periodic inspection and parts replacement details.
(7)
Disposal
•
Dispose of VFD properly as an industrial equipment wastes.
Summary of Contents for CI-007-P2
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Page 107: ......
Page 110: ...Chapter 6 Parameter Description 7 4 PID control with Pipe Broken function diagram...
Page 111: ...Chapter 6 Parameter Description 7 4 7 5 PID control with Pre PID function diagram...
Page 112: ...Chapter 6 Parameter Description 7 5 7 6 PID Control Setting Notes...
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