Yaskawa iQpump Controller Programming Manual - Manual (Page 233)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 233
P9 Network Options
<0034>
Note: For P9 group to be active, set P1-01 = 3 (MEMOBUS / Modbus)
◆ P9-01 Lead Drive Selection
◆ P9-02 Feedback Source
This parameter has the ability to run the iQpump MEMOBUS/Modbus Network with just one drive connected to a PI Feedback Source
and automatically switch from the Analog Feedback Source to the Network PI Feedback Source in case of transducer or wire breaks.
The drive Analog PI feedback signal and status is sent to the iQpump MEMOBUS/Modbus network. The status is dependent on the
regular PI Feedback Loss (b5-13 and b5-14) that is run in the background per drive. If the status is good and the drive is the current Lead
drive, that feedback signal is then used as the Network PI Feedback and will be constantly sent to all the drives in the network. If the
current Lead drive does not have a good status, then the Network PI Feedback is taken from another drive which has a good status.
When there is no Analog Feedback signal for PI Feedback, then the drive will use the Network PI Feedback register if it's allowed (see
P9-02 modes) and flash an alarm if desired.
When P1-01 = 3 and P9-02 = 1 or 2, parameter b5-12 will only do the specified action when the Network Feedback signal is lost (will
happen when none of the drives in the system has a valid PI feedback signal).
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Function Description:
<0034>
When P1-01 = 3 and b5-12 > 0, the analog feedback detection process is started automatically for all drives on the network that has
P9-02
≠
3 as soon as one of the drive gets a run command and is not running in pre-charge mode. When using the same parameters on a
4-20mA feedback source (H3-08 = 2 and H3-09 = B), the analog feedback detection process is always active. Drives that fail on the
feedback detection will indicate that their feedback signals are invalid and will not be considered by the iQpump MEMOBUS/Modbus
Network as good sources. The network in turn will read out the valid signals, select using lead-drive priority, and send it back to all the
drives as the Network PI Feedback. If the current lead drive has a valid analog feedback signal, then it will be the Network PI Feedback
signal. Otherwise, the Network PI Feedback signal is set to a drive with a good analog signal based on the Drive Discovery of the iQpump
MEMOBUS/Modbus Network. In both cases, a status bit is also sent out indicating that the network has a good feedback source.
When P9-02 = 0 (Analog Only), the drive will never read the Network PI Feedback register as the feedback source, even though the drive
will still transmit its own PI Feedback signal to the network. The feedback detection is based solely on parameter b5-12.
When P9-02 = 1 (Ana => Net, No Alrm), the drive will read the Network PI Feedback register if the analog feedback detection
determines a signal loss. If the network Feedback signal is invalid as well, it will act according to b5-12 (= 1 or 2). Note that setting b5-12
= 0 and H3-09 = B will disable analog feedback detection and will prevent the drive from switching to the Network PI Feedback.
When P9-02 = 2 (Ana => Net, Alarm), the drive will read the Network PI Feedback register if the analog feedback detection determines
a signal loss. In addition, an alarm will be displayed indicating that the analog has been lost, and that the feedback source is now the
network. If the network Feedback signal is invalid as well, it will act according to b5-12 (= 1 or 2). Note that settings b5-12 = 0 and
H3-09 = B will disable analog feedback detection and will prevent the drive from switching to the Network PI Feedback.
When P9-02 = 3 (Network Only), the drive will always read the Network PI Feedback register. If the network feedback signal is invalid,
it will act according to b5-12 with the following differences:
• b5-12 = 1: Instead of alarm, NetwrkFB Lost message
• b5-12 = 2: Instead of fault, NetwrkFB Lost message, drive will not accept iQpump Network run commands, and coasts-to-stop
Note: Any drive with b5-12 = 0, H3-09 = B, and P9-02
≠
3 will effectively have no feedback loss detection (unless Wire Break
detection is used) and will continuously send the Analog PI Feedback to the iQpump Network regardless of whether it is
a healthy signal or not.
Setting Description
0 Next Available
1 Lowest Runtime
Setting Description
0 Analog Only
1 Ana => Net, No Alarm
2 Ana => Net, Alarm
3 Network Only