The Drivespace Watchdog; Drivespace Watchdog Alarms - GE Multilin DDFR Instruction Manual

Distributed digital fault recorder

Table of Contents

CHAPTER 3: DDFR CONFIGURATION

3.4.3

The DriveSpace WatchDog

Note

DISTRIBUTED DIGITAL FAULT RECORDER – INSTRUCTION MANUAL

The DDFR has a DriveSpace WatchDog that alerts you that internal storage space in the

DDFR is reaching capacity.

• When the storage space in DDFR reaches a certain preset level (defaulted to 75%

of record storage capacity), the DDFR sends an alert to protection relays

connected to the network.

• The level of filled storage space required to trigger the sending of the message is

not configurable.

• The message is sent to the protection relays through a Modbus Force Coil

command and the relays receiving this command are selectable by you.

At this point, the DDFR automatically begins erasing the oldest stored records. The DDFR

continues the process of erasing the oldest data in the DDFR until the amount of available

record storage space for saving data reaches a preset level (defaulted to 70%).

Information is not deleted as part of this removal process, that has not previously been

archived to the central archiving system. The Archiver is discussed in chapter 5 of this

manual.

During the data erasing process, the DDFR checks the date of the oldest Waveform Fault

record, the date of the oldest Data Logger record (UR relays only), and the date of the

oldest Event on the Merged Events record. The DDFR then erases the oldest piece of

information from among these pieces of stored data.

The DDFR also allows you to manually erase all the data stored on a DDFR. This command

is sent to the DDFR from the EnerVista DDFR Setup program. Use the Commands > Clear

Data command to do this,

Figure 3-12 shows the alarm settings related to the DriveSpace WatchDog.

These settings are non-configurable (ie: fixed).

FIGURE 3–12: DDFR DriveSpace WatchDog Alarm Settings (fixed)

Send DriveSpace WatchDog when 'Used Space' capacity of Local Disk

exceeds 75 %

When the DDFR's used storage space exceeds this level, a Virtual Input

command will be sent to a UR device (defined in the WatchDog – External

tab). The Virtual Input can be monitored via SCADA or a HMI and trigger an

appropriate alarm.

CONFIGURING THE DDFR WATCHDOGS

Table of Contents