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5-107

5-8 Restart Functions

SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)

Functions

Controlled Deceleration on Power Loss (b050 = 01)

After the power is shut off during operation, the Inverter decelerates to a stop while keeping

the voltage below the setting of

Deceleration Hold Level of Ctrl. Decel (b052).

If the power is shut off during operation and the voltage falls below the DC Bus Voltage Trigger Level

of Ctrl. Decel (b051), the frequency deceleration width decreases to the Freq. Drop to Start Ctrl.

Decel (b054), and then the Inverter decelerates for the Deceleration time of Ctrl. Decel (b053).

If an overvoltage condition occurs (the level of Deceleration Hold Level of Ctrl. Decel (b052) is

exceeded) due to regeneration while the Inverter is decelerating, this function does not operate

and the Inverter will not decelerate until the overvoltage condition is reset.

*3.When the Deceleration Hold Level of Ctrl. Decel (b052) < the DC Bus Voltage Trigger Level of Ctrl.

Decel (b051), the Inverter performs this function by increasing the Deceleration Hold Level of Ctrl.

Decel (b052) to the DC Bus Voltage Trigger Level of Ctrl. Decel (b051). (Take note that the set values

are not changed.) If b052 is smaller than the equivalent incoming voltage (equivalent DC voltage after

rectification [incoming voltage × ]), this function does not operate and the Inverter cannot decelerate

when the power supply is cut off during the operation. (The Inverter will accept neither a STOP

command nor frequency reference change until the operation is completed.)Make sure that the b052

setting is higher than the normal incoming voltage or equivalent.

*4.If the Freq. Drop to Start Ctrl. Decel (b054) is too large, an overcurrent trip occurs because of rapid

deceleration. If b054 is too small, or if the Deceleration Time of Ctrl. Decel (b053) is too long, an

undervoltage trip occurs because of insufficient regeneration power.

√

Main circuit PN-PN voltage

Undervoltage level

Output frequency

(Hz)

Time (sec)

VPN (V)

b052

b051

b054

b053

Time (sec)

Omron SYSDRIVE MX2 SERIES User Manual

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