Yaskawa iQpump Programming Manual - Manual (Page 104)

104 YASKAWA TM.iQp.02 iQpump Drive Programming Manual
◆ L4 Speed Command Loss Detection
■ L4-01 Speed Agreement Detection Level
Setting Range: 0.0 to 200.0 Hz
Factory Default: 0.0 Hz
■
L4-02 Speed Agreement Detection Width
Setting Range: 0.0 to 20.0 Hz
Factory Default: 2.0 Hz
Parameters L4-01 and L4-02 are user specified levels for use with the Fref/Fout Agree 1, Fref/Set Agree 1, and Freq Detect 1 & 2 digital
output functions. Please refer to the H2 Digital Output Parameters for more information.
■
L4-05 Frequency Reference Loss Detection Selection
Note: Only available in Hand Mode (P5-01 = 0).
■
L4-06 Frequency Reference at Loss of Frequency Reference
Setting Range: 0.0 to 100% of previous speed command
Factory Default: 80% of previous speed command
The Drive can be configured to compensate for the loss of its external speed command. An external speed command is considered lost if
it drops 90% of its value in 400 mS or less.
Figure 1.89
Figure 94 Loss of Frequency Reference Timing Diagram
To enable Frequency loss detection, set L4-05 = “1: Enabled @% of PrevRef”. If Frequency Reference Loss Detection is enabled and the
reference is lost, the Drive continues to operate at the speed commanded by parameter L4-06. When the speed command returns, the
Drive again follows the speed command.
Setting H2-01 / H2-02 = “C: Loss of Ref”, configures a digital output as a Frequency Reference Loss indication only when L4-05 = “1”
Enabled @% of PrevRef”.
Note: Only available in Hand Mode (P5-01 = 0).
Setting Description
0 Disabled
1 Enabled @% of PrevRef ( factory default)
T
Frequency
Reference
Output
Frequency
100%
10%
T = 400 mS
L4 - 06
Time