Yaskawa iQpump Drive User Manual - Manual (Page 83)

4.8 Feedback Loss Detection
YASKAWA TM.iQp.01 iQpump Drive User Manual 83
4.8 Feedback Loss Detection
◆ b5-12, b5-13, b5-14
Table 4.15
The iQpump drive offers a feedback signal loss detection function in case the connected feedback device fails or a problem with the
wiring occurs.
■
b5-12 PI Feedback Reference Missing Detection Selection
Factory default setting: 0: (Disabled)
To enable feedback loss detection, program parameter b5-12 to a value greater than 0 and b5-13 Feedback Loss Detection Level to the
minimum feedback level for normal operation.
b5-13 Feedback Loss Detection Level Range: 0 to 100%
b5-14 Feedback Loss Detection Time Range: 0.0 to 25.5 sec. (1.0 Factory Default)
Figure 4.8 Loss of PI Feedback Feature
Example: Constant Pressure System
Pressure Transducer: 150 PSI (4 ~ 20mA)
Desired Operation:
Feedback Loss Fault when pressure falls below 15 PSI for more than 5.0 sec.
Solution:
Program b5-12 to 2 Feedback Loss Detection Fault
Program b5-13 to 10% (15 PSI divided by 150 PSI times 100% = 10%)
Program b5-14 to 5.0 sec.
Parameter
No.
Modbus
Address
Parameter Name
Digital Operator
Display
Description
Setting
Range
Factory
Setting
Menu
Location
Page
No.
b5-12 01B0H
PI Feedback
Reference
Missing Detection
Selection
Fb los Det Sel
0: Disabled
1: Alarm
2: Fault
0 to 2 0 Programming 101
b5-13 01B1H
PI Feedback Loss
Detection Level
Fb los Det Lvl
Sets the PI feedback loss detection level as a percentage of maximum
frequency (E1-04).
0 to 100 0% Programming 101
b5-14 01B2H
PI Feedback Loss
Detection Time
Fb los Det Time
Sets the PI feedback loss detection delay time in terms of seconds. 0.0 to 25.5 1.0 sec Programming 101
Setting Description
0 Disabled (factory default)
1 Alarm
2 Fault
Measured
Feedback
T
t
Feedback
Loss Output
T
b5-13
T = b5-14
Feedback
Loss Digital Output
ON (CLOSED)
OFF (OPEN)
TIME