PP845 3BSE042235R1

Brand:ABB

Type:PP845 3BSE042235R1

Origin: the Swiss

Warranty: 365 days

Colour: new/used

Shipping method: Courier delivery

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When using the ENTER key from the front panel keypad, the 505E checks the validity of the new entered setpoint. The speed setpoint must be below the maximum governor setting and above the idle setting and not within a critical speed avoidance band. Once the speed setpoint is above the minimum governor setting, the setpoint cannot be set below minimum governor. Also, if the unit is driving a generator and the unit is on-line, the speed setpoint cannot be set below the minimum load setting. The minimum load setting is defaulted to a 3% load setting (changeable in the Service Mode). The speed setpoint can also be directly entered through Modbus, however, the allowed range is between the minimum governor and the maximum governor speed settings. With generator applications, the allowed setpoint range is limited to between the minimum load and the maximum governor settings if the unit is on-line. When the 505E is configured for a generator application, a special speed setpoint rate (Sync Window Rate) is used to increase setpoint resolution around synchronous speed. This allows for tighter setpoint control to accommodate synchronizing manually or by an automatic synchronizer which interfaces to the 505E discretely. This Sync Window Rate is defaulted to two rpm/sec and is only used when the generator breaker is open and the speed setpoint is within 10 rpm of rated speed. Both the synchronizing rate and the synchronizing window are tunable in the Service mode.

When configured for generator applications a Minimum Load setpoint is used by the 505E to reduce the chance of reverse powering a unit upon closing the generator breaker. With the utility tie breaker closed, when a generator breaker closed indication is received, the Speed setpoint is stepped to the Minimum Load setting. The Minimum Load setting is defaulted to a 3% (changeable in the Service Mode). To disable the use of the Minimum Load Setpoint, configure the ‘Use Min Load’ setting (under the Service mode’s ‘BREAKER LOGIC’ header) to ‘No’. See Chapter 6 for a list of all speed setpoint related Modbus parameters. Frequency Arm/Disarm The Frequency Arm/Disarm feature may be used when multiple generator sets are on a common isolated bus. and no other type of loadsharing is used. With this feature, one unit on a multiple unit isolated bus controls frequency and the other units operate in a unit-load mode. The unit controlling frequency is referred to as the “Swing Machine” because its load will swing (vary) depending on the load of the plant. Caution should be taken with this configuration to not allow the Swing Machine to be overloaded or reverse powered.