4−26
Commercial power source switchover
The commercial power source switching function allows you to switch the power supply
(between the inverter and commercial power supply) to your system of which the load
causes a considerable moment of inertia. You can use the inverter to accelerate and
decelerate the motor in the system and the commercial power supply to drive the motor
for constant speed operation.
To use this function, assign parameter “14 (CS)” to one of the intelligent input terminal
[1] to [7] (C001 to C007). When the CS is turned OFF with an operation command is
being given, the inverter waits for the retry wait time before motor starts (b003),
adjusts the output frequency to the speed of the free-running motor, and then
accelerates the motor with the adjusted frequency.
Mechanically interlock the MC3 and
MC2 contacts with each other.
Otherwise you may damage the drive.
If the earth leakage breaker (ELB) trips
because of a ground fault, the commercial
power will be disabled. Therefore, contact
a backup power supply from the
commercial power line circuit (ELBC) to
your system if needed.
Use weak-current type relays for FWY, RVY, and CSY. The figures below show the
sequence and timing of operations for reference.
If the inverter trips because of overcurrent when it starts the motor with frequency
matching, increase the retry wait time before motor starts (b003).
Option
Code
Terminal
Symbol
Function Name State Description
14
CS Commercial power
source switchover
ON
OFF
Valid for inputs:
C001~C007
Required settings
b003, b007
Notes:
inverter may start the motor with 0 Hz if:
• the motor speed is no more than half of the base frequency, or
• the voltage induced on the motor is attenuated quickly.
MC3
THRY
Moto
To Next Page
Loading...
