58
PIM00504
12.7.3 [P48 : T_SP] Reverse rotation warning judgment wait time/[P49: SMTM] Start
acceptance wait time
No.
Code
Name
Setting range Default value
Unit
P48
T_SP
Reverse rotation warning judgment wait time
0 - 99.9
0.5
sec
P49
SWTM Start acceptance wait time
0 - 99.9
0
sec
If the motor rotates in reverse during stop operation and is restarted with load pressure remaining in the
piping at the start, it is possible that the start will fail. For this reason, if the motor is rotating in reverse a
reverse rotation warning status is judged, and the start of motor excitation can be automatically delayed
by setting [P48 : T_SP] “Reverse rotation warning judgment wait time”.
Note also that when the volume of the piping is large, by setting [P49:SWTM]
“Start acceptance wait time”
as an adjustment when there is residual pressure in the piping, even when the pressure detected by the
pressure sensor is less than the pressure for judging a reverse rotation warning, the motor start can be
delayed beyond the reverse rotation warning judgment wait time end point, or the point when the reverse
rotation warning is canceled.
The time charts when a reverse rotation warning has been issued and when none has been issued are
presented below.
Time chart for a start when no reverse rotation warning has been issued
Time chart for a start when a reverse rotation warning has been issued
Operation
Normal control
Stop
Normal control
Start/stop signal
Reverse rotation warning
(L70) recognition
Motor rotation speed
L: Run command H: Stop command
No L70
Pressure
Reverse
rotation in
progress
P49:SWTM: Start acceptance wait time
Waiting for start because there is residual pressure
No L70
L70 issued
0.5 Mpa
0 min
-1
0 MPa
P48:T_SP
Reverse rotation warning judgment wait time
Motor excitation
Operation
Stop
Normal control
Start/stop signal
(when D1_A = 1)
Motor rotation speed
H: Stop command
Pressure
P48:T_SP
Reverse rotation warning
judgment wait time
P49:SWTM
Start acceptance wait time
L: Run command
0 min
-1
0 MPa
Motor excitation
