5-60
C21
Timer Operation
C21 enables or disables a timer operation that is triggered by a run command and continues
for the timer count previously specified with the
/
keys. The operating procedure for the
timer operation is given below.
Data for C21
Function
0
Disable timer operation
1 Enable
timer
operation
• Pressing
the key during timer countdown quits the timer operation.
• Even if C21 = 1, setting the timer to 0 no longer starts the timer operation with the
key.
• Applying terminal command
FWD
or
REV
instead of the key command can also
start the timer operation.
Operating procedure for timer operation (example)
Preparation
• To display the timer count on the LED monitor, set E43 (LED Monitor) to "13" (Timer) and
set C21 (Timer Operation) to "1" (Enable).
• Specify the reference frequency to apply to timer operation. When the keypad is selected
as a frequency command source, press the
key to shift to the speed monitor and
specify the desired reference frequency.
Triggering the timer operation with the
key
(1) While watching the timer count displayed on the LED monitor, press the
/
key to set
the timer for the desired count in seconds. Note that the timer count on the LED monitor
appears as an integral number without a decimal point.
(2) Press the
key. The motor starts running and the timer starts counting down. If the timer
counts down, the motor stops without pressing the
key. (Even if the LED monitor
displays any item except the timer count, the timer operation is possible.)
After the countdown of the timer operation triggered by a terminal command such
as
FWD
, the inverter decelerates to stop and at that moment the LED monitor
displays
end
and any LED monitor item (
0
for the timer count) alternately. Turning
FWD
OFF returns to the LED monitor item.
C33
C38
Analog Input Adjustment for
Terminal [12] (Filter time constant)
Analog Input Adjustment for Terminal [C1] (Filter time constant)
C33 and C38 configure a filter time constant for an analog voltage and current input on
terminals [12] and [C1], respectively.
The larger the time constant, the slower the response. Specify the proper filter time constant
taking into account the response speed of the machine (load). If the input voltage fluctuates
due to line noise, remove the cause of the noise or take an electric circuit related measure.
Only when no effect is obtained, increase the time constant.