482
YASKAWA
TOEPYAIHV6002A HV600 Drive Programming
Network Activity Monitor
UA-02
Network State
The drive is the master of the network and is communicating with other drives.
<M> identifies that the drive is the master.
The drive is a node on the network and is communicating with the master.
<+> identifies that the drive is a node.
The drive cannot communicate with other drives.
<-> identifies that the drive is offline.
Make sure of these points:
•
No drives show [<->]
•
All drives are receiving valid data identified by a regular change in the monitor value.
•
A minimum of one drive shows [<M>] and the others show [<+>].
If a drive shows [<->]:
•
Make sure that the physical connections are correct.
•
Confirm the setting of
H5-xx [Modbus Communication]
.
•
Confirm the values set in
Y9-25
and
Y9-27
on all drives.
–
Set
Y9-25
to the highest
H5-01
value.
–
Set
Y9-27 = 0
on one of the drives.
•
Cycle power to the drive.
■
Multiplexing
The Lead Drive uses
Y9-08 [Staging Mode]
to
Y9-11 [Staging Delay Time]
to determine if it is necessary to stage, and
Y9-12 [De-staging Mode]
to
Y9-15 [De-staging Delay Time]
to determine if it is necessary to de-stage.
Staging will request a new Lead Drive and make the current drive a Lag Drive. MEMOBUS Multiplex will request a
stage only when there are drives available to run and the number of drives running is fewer than
Y9-23 [Max Drives
Allowed to Run]
.
De-staging will make the previous Lead Drive (now a Lag Drive) a Lead Drive again, and stop the current Lead
Drive. MEMOBUS Multiplex will request a de-stage only when there are two or more drives running. With this setup,
there can only be one Lead Drive on the network at any time. The drive does the quick de-stage function when the
drive detects:
•
High feedback (based on
Y1-09 [Low Feedback Lvl Fault Dly Time]
and
Y9-18 [High Feedback De-stage Level]
)
for 2 s for Direct-Acting PI operation.
•
Low feedback (based on
Y9-34 [Low Feedback De-stage]
) for 2 s for Reverse-Acting PI operation.
Note:
The drive starts to detect staging and de-staging when the Lead Drive is equal to or more than the minimum speed. The minimum speed is
the largest value from
d2-02 [Frequency Reference Lower Limit]
,
Y1-06 [Minimum Speed]
, and
Y4-12 [Thrust Frequency]
.
