Yaskawa GPD503 Drive - Manual (Page 36)

2.4 AUTO REFERENCE - LOSS DETECTION
Sn-06: Operation Mode Digit 4 [ X X X X ] : Auto Reference
Select 3 Loss Detection
Factory setting: 0 X X X (disabled)
The reference loss detection function is either enabled or disabled, based on the setting of
Sn-06 X X X X. When enabled (
1 X X X ), the reference loss detection compares the
change in reference with respect to time (0.4 seconds). If longer than 0.4 seconds, the
GPD 503 will decelerate to the set reference; if shorter than 0.4 seconds, the GPD 503 will
continue to operate at 80% of the output frequency. To regain control of output
frequency, either exceed the set reference (80% of reference) or initiate a STOP command.
(If Auto Reference is less than Fmax (Cn-02) x .05, then this function is not performed.)
FWD RUN
COMMAND
AUTO
REFERENCE
GPD 503
OUTPUT
FREQUENCY
80%
REF
10%
80%
FREQ.
0.4 SEC 0.4 SEC
Time Chart
2-5