Yaskawa GPD503 Drive - Manual (Page 79)

2.28 SPEED SEARCH Continued
B. Cn-38: Speed Search Deactivation Current Level Factory setting: 150 %
Range: 0 to 200 %
After power recovery, if the GPD 503 output current is larger than the set value of Cn-38,
speed search is started. When GPD 503 output current is lower than the set value of
Cn-38, speed search is complete and acceleration or deceleration is continued to set
frequency.
C. Cn-39: Speed Search Decel Time Factory setting: 2.0 sec.
Range: 0.0 to 25.5 sec.
This constant sets deceleration time during speed search, in units of 0.1 second. A setting
of 0.0 seconds disables speed search.
D. Cn-40: Minimum Baseblock Time Factory setting: GPD 503
rating dependent
Range: 0.0 to 25.5 sec.
When a momentary power loss is detected, the GPD 503 output transistors are disabled for
a period of time determined by the setting of Cn-40. The Cn-40 setting should represent
the time required for the motor residual voltage to go to zero.
When the time of the momentary power loss time exceeds the minimum baseblock time,
the speed search operation is started immediately after power recovery.
2-42.2
Changed
WHEN MIN. BASEBLOCK TIME IS LONGER THAN MOMENTARY POWER LOSS TIME
MOMENTARY POWER
LOSS TIME
MIN.
BASEBLOCK TIME
GPD 503
BASEBLOCK TIME
WHEN MIN. BASEBLOCK TIME IS SHORTER THAN MOMENTARY POWER LOSS TIME
MOMENTARY POWER
LOSS TIME
MIN.
BASEBLOCK TIME
GPD 503
BASEBLOCK TIME