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Starting a Backup Pair of DPUs
10.
Secure module to chassis assembly with the top and bottom lock down
screws on the front of the module.
11.
Before it begins DPU Bus communications, the DPU will initially
display FF as its front panel LEDs, progress through a series of steps
counting down from 0F to 06. Once it begins communicating, a healthy
DPU will display a rapidly flickering number whose value is
predominantly 07.
12.
Return mode switch 4 to the left.
13.
Reload the DPU using maxTOOLS at a maxSTATION
Dump/Reload mode at the Operator Station.
14.
Acknowledge all alarms from the DPU and make sure that they all clear.
15.
Display Interaction Page 9 of the DPU at a maxSTATION. Locate the
Backup? Field and type n for no; locate the Startup? Field and type y
for yes.
16.
Place the keyswitch in the Run or Locked mode.
When starting a backup pair of DPUs, you must bring the primary DPU up
first and make sure it is running properly before starting the secondary.
Perform the following steps to ensure that an unexpected failover does not
occur during the startup process.
To start DPU backup pairs:
1.
Turn
both
DPU
counter-clockwise).
2.
Set the top most backup DIP switch appropriately for each DPU (to
the right for primary, to the left for secondary).
3.
Set the remaining backup switches (shared/separate I/O) appropriately
as described in Chapter 2,"Backup DIP Switch Settings"; make sure
the corresponding switch positions match in each DPU.
4.
On each DPU, set front panel mode switches 1, 2, and 8 to the left; set
mode switch 4 to the right to demand Cold startups from each unit.
5.
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
Metso Automation MAX Controls • • • • 277573 • • • •
keylocks
to
the
Offline
Starting the DPU
or the
position
(fully
6-3
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