Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Spécifications télécharger pdf (Page 40)

Model PDP Series 200 maxDPU4E Hardware Guide

40. Acknowledge all alarms from the DPU pair and make sure that alarms

are all clear.

41. Place the key switch of the secondary DPU in the Run or Locked mode.

Replacing a DPU in a Backup Pair

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 if it is not Active and

verify it properly assumes control of the process.

2. Turn the key switch of the DPU being replaced to the Off-line position

(fully counter-clockwise).

3. 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 60 seconds if the DPU failed in a fatal state.

4. On the new DPU, verify that the NiCd battery pack is plugged in

correctly to the motherboard connector.

5. Replace the DPU with the new unit by positioning the new DPU into the

top and bottom card guides of the chassis, but DO NOT push the new

unit in far enough to apply power to it.

6. Set the Mode switch to “B” if necessary to demand a Blank startup.

7. Carefully slide the module forward, verifying that the connector pins on

the solder side of the module engage the corresponding contact guides on

the chassis assembly.

8. When the contacts are engaged and resistance is felt, firmly press on the

front panel of the module front plate to make the simultaneous

connections at the front and rear. Apply pressure to the left of the LEDs

to place the force directly in line with the printed circuit card of the

module.

9. Secure module to chassis assembly with the top and bottom lock

down screws on the front of the module.

10. Return Mode switch to “F” if necessary.

Metso Automation MAX Controls Inc. • 278590 •

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Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Spécifications Page 40