Mitsubishi Electric 800 Series, Инструкция по эксплуатации, Страница: 530 / 727

(A) Application parameters
PARAMETERS
529
5
GROUP
A
 Automatic adjustment of deceleration time (Pr.261 ="21, 22", Pr.294,
Pr.668)
• When "21, 22" is set to Pr.261 , the deceleration time is automatically adjusted to keep (DC bus) voltage constant in the
converter when the motor decelerates to a stop at a power failure. Setting of Pr.262 to Pr.266 is not required.
• If a phenomenon such as motor vibration occurs during operation of the deceleration time automatic adjustment function,
adjust the response level by setting the Pr.668 Power failure stop frequency gain . Increasing the setting improves the
response to change in the bus voltage. However, the output frequency may become unstable.
• If setting Pr.294 UV avoidance voltage gain lower also does not suppress the vibration, set Pr.668 lower.
 Deceleration stop by the power failure stop external signal (X48)
• By turning OFF X48 signal, the power failure time deceleration-to-stop function is activated. This function is used, for
example, when an external power failure detection circuit is installed.
• To use the power failure time deceleration-to-stop function for the separated converter type, use X48 signal. Connect the
terminal to which PWF signal of the converter unit is assigned and the terminal to which X48 signal of the inverter is
assigned.
• In the initial setting, X48 signal is used with the normally closed (NC contact) input specification. Use Pr.606 Power failure
stop external signal input selection to change the specification to the normally open (NO contact) input.
• To use the X48 signal, set "48" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function to an
input terminal.
 During deceleration at occurrence of power failure signal (Y46)
• After deceleration by a power failure, the inverter is not restarted even though the start command is input. Check the during
deceleration at occurrence of power failure signal (Y46) at a power failure. (for example, when input phase loss protection
(E.ILF) occurs)
• The Y46 signal is turned ON during deceleration at occurrence of power failure and in a stop status after deceleration at
occurrence of power failure.
• For the Y46 signal, assign the function by setting "46 (forward action)" or "146 (reverse action)" in any of Pr.190 to Pr.196
(Output terminal function selection) .
Deceleration time : Automatic adjustment
STF
Y46
Time
Pr.261 = 21
Power
supply
Output
frequency
During deceleration at
occurrence of power failure
During stop at occurrence
of power failure
Turn OFF STF once to make acceleration again