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Model PDP DPU Installation, Preparation and Adjustment
5-2
If you manually transfer to primary while the primary has a severe diagnostic
alarm, automatic failover may cause control to transfer back to the secondary
when you release the Takeover button, as described above.
Cable Disconnect
The backup serial link cable (Part number 081387) carries data signals
between the primary and secondary DPUs, as well as a status signal which
determines which DPU is active. If one end of this cable is removed from
either DPU, that unit is rendered inactive.
If a DPU is not part of a backup pair, a terminator (Part number 081388)
must be inserted in place of the cable.
Metso Automation MAX Controls • • • • 277573 • • • •
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