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Replacing a DPU in a Backup Pair
21.
Reload the secondary DPU using maxTOOLS at a maxSTATION or
the Dump/Reload mode at an Operator Station.
22.
Acknowledge all alarms from the DPU pair and make sure that
secondary alarms are all clear.
23.
Display Interaction Page 9 of the DPU at a maxSTATION or Operator
Station. Locate the Backup? Field and type y for yes; locate the
Startup? Field and type y for yes.
24.
Make sure that the primary DPU is displaying the alarm Backup Link
Timeout to make sure there are no higher priority alarms.
25.
Place the keyswitch of the secondary DPU in the Run or Locked
mode.
26.
Acknowledge all DPU alarms and make sure they all clear.
When replacing a DPU in a backup pair, it is necessary to prevent the new
unit from gaining control until it is properly configured and up to date.
Perform the following steps to ensure that an unexpected failover does not
occur during the replacement process.
To replace a DPU in a backup pair:
1.
Make sure there are no severe outstanding alarms from the DPU
which is to remain in service, then press its Takeover switch.
2.
Turn the keylock of the DPU being replaced to the Offline position
(fully counter-clockwise).
3.
Without disconnecting any cables, pull the DPU being replaced far
enough out of its chassis to disconnect power, then wait until all its
LEDs have turned off; this may require up to 30 seconds.
4.
Disconnect the backup cable from the DPU being replaced; DO NOT
disconnect the other end of the cable from the DPU which is to
remain.
5.
On the new DPU, verify that the NiCd battery pack is installed and
plugged correctly into P10 connector on the motherboard.
Additionally, verify that protective connectors (Part number 081389)
are installed in the IOM and CPU load connectors.
6.
Replace the DPU with the new unit, position the new DPU into the
top and bottom card guides of the chassis, but DO NOT push the new
Metso Automation MAX Controls • • • • 277573 • • • •
Starting the DPU
6-5
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