Yaskawa MP940 Reference Manual - Manual (Page 289)

MotionSuite™ MP940 Machine Controller Reference Manual SGDH User Parameters
6-89
Pn509
Momentary Hold Time ms
20 ~ 1000 When the power voltage to the servo
amplifier is momentarily turned OFF,
the servo amplifier detects this condi-
tion, and shuts off the servo.The 20ms
factory setting means that operation
continues as is if a momentary power
loss is 20ms or less. However, in the
following cases, this has nothing to do
with the setting of the Momentary Hold
Time, but is rather related to servo
alarms or control not possible states
(these are handled in the same way as
normal power OFF operations).
When the servo motor load is exces-
sive, and a low voltage alarm (A.41) is
generated in a momentary power loss;
when control becomes impossible
(handled in the same way as a normal
power OFF operation) during a
momentary loss of control power.
Momentary power loss detection
detects an ON/OFF state in the main
circuit power. The off state is ignored
and operation continues if the recovery
form OFF to ON is occurs within the
time set in user parameter Pn509. 20 Speed
Torque
Position
Sequence Related Parameters (Continued)
User
Parameter
Number
Digit
Position
Name
(setting
range)
Content
Default
Setting Control
Mode
Source
Voltage
Occurence of
Momentary Power Loss
t OFF
Time
In (1)
In (2)
Servo ON
Servo ON
Servo OFF
(1) Pn509 Setting > t OFF
(2) Pn509 Setting < t OFF