YASKAWA GPD315/V7-4X, Technical Manual

Page: 113 / 162

n 0 6 4 : Frequency Reference Loss Detection Factory setting: 0 (disabled)
Range: 0 or 1
The reference loss detection function is either enabled or disabled, based on the setting
o f n 0 6 4. When enabled (data " 1 "), the reference loss detection compares the change in
reference with respect to time. If the reference decreases by 90% in more than 0.4
seconds, the drive will decelerate to the set reference; if the reference decreases by 90%
in less than 0.4 seconds, the drive 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 (n 0 1 1) x .05,
this function is not performed.
5-57
FWD RUN
COMMAND
AUTO
REFERENCE
GPD 515
OUTPUT
FREQUENCY
80%
REF
10%
80%
FREQ.
0.4 SEC 0.4 SEC
T i m i n g C h a r t
5.33 FREQUENCY REFERENCE LOSS DETECTION
Note: This function applies to frequency references at terminal FR, RP or 2CN (Multi-Function
Analog Input).
Undertorque detection is used to compare Drive output current/torque with the undertorque
detection level. When the output current is equal to or less than the defined level, an undertorque
condition exists. This will be indicated as a UL3 fault on the Digital Operator. This feature can be
selected to operate over a wide range of conditions.
A. n117 : Undertorque Detection Factory setting: 0
This constant determines whether the undertorque detection function of the Drive is enabled, under
what conditions it will detect for undertorque, and what operation it will perform after detecting an
undertorque.
Operation
Undertorque After Detection
Setting Disabled Detection Condition
0 Disabled —— ——
1 Undertorque Continues Only at set frequency
2 Undertorque Coast to stop Only at set frequency
3 Undertorque Continues At all times except during
stopping or DC injection braking
4 Undertorque Coast to stop At all times except during
stopping or DC injection braking
5.34 UNDERTORQUE DETECTION