Woodward 2301E-J Microcomputer-Based Digital Controller

OVERVIEW

The 2301E-J is a microcomputer based digital controller for engine genset control with automatic load sharing.

The controller is designed to control medium to high speed diesel engines or medium to high speed gas engines.

Control speed range (for medium to high speed engines): 400-3600 rpm.

Similar in function to the 2301A LSSC, the 2301E-J is Woodward's traditional analogue controller plus a DRU (Digital Reference Unit) with soft load/unload.

The 2301E-J also has the same features as the 2301D.

While the engine is operating, the 2301E-J can switch its operating mode from isochronous to sag and vice versa without buffering.

The 2301E-J can be switched to the 2301D by using the same function as the 2301 LSSC, the 2301A LSSC, the 2301D LSSC, and the 721DSC with Automatic Load Sharing,

723DSC with automatic load sharing, or other Woodward Electric controls with load sharing capability to operate in automatic load sharing mode.

In conjunction with an external inlet/outlet controller, the 2301E-J can control the inlet/outlet power to the mains (i.e., commercial bus) by simulating a remote speed setting signal (optional feature).

The 2301E-J can operate in isochronous mode, isochronous base load mode, kilowatt drop mode, normal speed drop mode, and mains parallel operation mode with GCP/EGCP.

In Isochronous operation mode, the 2301E-J can perform the following operations

- Parallel operation with multiple engine-generator sets connected to the bus via automatic load sharing functions (including soft load and soft unload).

- Base load operation in isochronous mode. (The load level can be preset or manually adjusted to the desired level using discrete or analogue inputs).

- Single engine generator operation. (Speed reference is manually adjusted to the desired level via discrete or analogue inputs).

In kW down operation, the 2301E-J can perform the following operations:

- Run in parallel with the mains. (Load level or speed reference preset or manually adjusted to the desired level via discrete or analogue inputs).

- Parallel operation with other engine generator sets. (Manual adjustment of the speed reference to the desired level via discrete or analogue inputs).

- Single engine genset operation. (Manual adjustment of the speed reference to the desired level via discrete or analogue inputs).

- In reduced speed operation, the 2301E-J can perform the following operations:

- Run in parallel with the power supply. (Manually adjust the load level or RPM reference to the desired level via the discrete inputs or analogue inputs).

- Operate in parallel with other engine generator sets. (Manually adjust the load level to the desired level via the discrete inputs or analogue inputs).

- Single engine genset operation. (Manually adjust the speed reference to the desired level via the discrete or analogue inputs).

The 2301E-J system has the following inputs/outputs:

- 1 kW sensing input, including 3-phase PT inputs and 3-phase CT inputs

- 1 speed sensing input (MPU input)

- 2 analogue inputs for (4-20 mA) current signals or (±2.5 V, 1-5 V, or 0-5 V) voltage signals

- 8 discrete inputs

- 1 actuator drive circuit

- 1 analogue 4-20 mA output (optionally with signal display via this output)

- 4 discrete outputs (low-side actuator; max. 200 mA potting current)

- 2 serial ports (RS-232 and RS-422)

The 2301E-J system has the following features:

- Speed control: isochronous operation, kW down operation, speed down operation

- Load control: isochronous load sharing, isochronous base load, soft loading/unloading

- Equal speed/deceleration operation transfer function when generator is loaded

- Fuel Limiters: Start Fuel Limiter, Torque Fuel Limiter, Manifold Fuel Limiter, Maximum Fuel Limiter

Equipment required to operate the engine generator set with the 2301E-J:

- 2301E-J Controls

- 24 Volt DC Power Supply

- Speed sensing device (MPU, etc.)

- Actuator to drive fuel rack or gas valve (proportional)

- CT and PT for generator kW sensing or analogue kW signals

The 2301E-J requires a nominal 24 Vdc voltage source. (Supply voltage range is 18 to 36 volts DC).

The controller is mounted in a sheet metal chassis and consists of a printed circuit board.

Functions

The 2301E-J has speed control, load control, equal speed/no load transfer, and fuel limiter functions.

Speed Control Function

- Rated speed range of 400-3600 rpm

- Constant speed speed control

- kW Reduced speed control

- Simple derating control is selectable (when selected, the load control function is not available)

- Idling/rated speed switching by discrete input signal

- Speed reference up/down using discrete input signals

- Fast synchronisation using analogue speed bias signal from synchroniser

- (Optional) Speed reference manipulation function using remote analogue signal

- Single point control gain setting (optional)

- A control gain curve consisting of 5 points with 4 ramps can be mapped to the engine to change gain under various operating conditions.

- Dual power function to switch control power according to engine load

Load control function

- Automatic isochronous load sharing function (including soft load handling from the generator breaker close to the start of automatic load sharing)

- kW Initial loading function after the generator breaker is closed in down operation.

- Automatic soft unloading function (generator breaker open output signal is unloading trip level)

- Asynchronous base load operation (optional remote load setting function)

- kW descending operation (remote load setting function via remote speed setting signal)

- Generator load operation using the speed down function. (The load control function is not applicable to speed drop operation).

Fuel Limiter Function

The 2301E-J has the following six fuel limiter functions:

- Start-up fuel limiter (including lower limit, upper limit, and slope from lower limit to upper limit)

- Maximum Fuel Limiter

- Torque limiter (5 points and 4 ramps)

- Boost Fuel Limiter (optional) (5 points and 4 ramps)

- Discrete Input Fuel Limiter

- Fuel limit is cancelled by discrete input signal

Equal Speed/Idle Switching Function

- Isochronous/idle switching by discrete input signal

- Trouble-free switching from isochronous operation to kW down operation

- Load ramp from kW load drop level when connected in parallel with the utility to isochronous load sharing level when connected in parallel

Isochronous base load operation

- Base load set point raise/lower function with discrete inputs

- Generator kW load remains constant regardless of utility frequency

- Base load set point raised/lowered by analogue remote signal