Yaskawa V7 Drives - Manual (Page 109)

5-57
n n 0 0 6 6 4 4 :: Frequency Reference Loss Detection
Factory setting: 0 0 (disabled)
Range: 0 or 1
The reference loss detection function is either enabled or disabled, based on the setting of n n 0 0 6 6 4 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
n 0 0 1 1 1 1) x .05, this function is not performed.
FWD RUN
COMMAND
AUTO
REFERENCE
GPD 515
OUTPUT
FREQUENCY
80%
REF
10%
80%
FREQ.
0.4 SEC 0.4 SEC
T Tiim miin ng g C Ch ha arrtt
5 5..3 33 3 F FR RE EQ QU UE EN NC CY Y R RE EF FE ER RE EN NC CE E L LO OS SS S D DE ET TE EC CT TIIO ON N
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