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Menu 5
Mentor MP Advanced User Guide 85
Issue Number: 4 www.controltechniques.com
Slave OK Bits
The loss of a slave OK input will trip the drive. This trip cannot be masked.
Figure 5-15 Slave OK bits
The 5 second power up delay is to allow the whole system to power up before checking that the slaves are healthy. Drive Active is used to ensure that
the slave OK is checked when the master is given a run command within the 5 second timeout.
Setup Sequence
To configure a drive as the master drive in a 6 pulse parallel system proceed as follows:
• Configure I/O dependant on how the slave OK is to be received.
•Set Pr 5.43 to 7 (Parallel 6P master).
•Set Pr 11.35 equivalent to the number of slaves in the system.
• Save the current setup and reset the drive.
•Pr 11.32 will now equate to the number of slaves in the system plus 1 x the Drive rating.
Slave 6-pulse parallel
The slave does not control it’s own thyristors so when a slave trips, the thyristors are still controlled from the master drive. The only exception is when
the power software generates a hardware fault. Following this event, the slave power processor will stop firing its own thyristors.
Figure 5-16 Slave 6 pulse parallel
In slave mode, the slave OK is the logical AND of the Received Master Comms and Drive OK signal. Slave OK can be routed to a relay so the master
has an indication of the status of the slave. The drive will trip if the master is active but the slave is not active. This ensures that the slave is enabled.
The slave must be enabled so the drive will trip SL when the supply to the slave is removed.
Received Master Comms
This bit is set when the drive is in slave mode, and has received acceptable serial comms signals from the master drive. When set, this bit is used to
hold the Slave OK flag low at power up or mode change. This bit will also revert to the false state if the comms lead between the master and slave is
removed.
Setup Sequence
• If using relay 1 as slave healthy, set Pr 8.27 to Pr 5.45.
•Set Pr 5.43 to 8 (Parallel 6P master).
• Save the current setup and reset the drive.
• The Line contactor control must be controlled from the master.
• Enable the drive.
• If the drive is not enabled the drive will trip Slave.Er.
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