Woodward DSLC Digital Synchronizer and Load Controller: Installation, Operation, and Troubleshooting Guide

Check that the number of DSLCs in the activity matches the number of installations

Set the load distribution gain to 0.72

Verify load distribution performance

4.3 Process Control Adjustment

Set process control gain, stability, derivative, dead zone, and filter parameters

Select direct or indirect control actions based on process characteristics

Set process reference values

Adjust dynamic parameters to achieve stable process control

Set process high and low limit values and alarm functions

4.4 Reactive Power/Power Factor Control Adjustment

Verify that voltage matching adjustment has been completed

Set reactive power/power factor gain and stability parameters

Set rated reactive power and reference value

Adjust and control dynamic parameters

Set power factor dead zone to reduce response to minor changes

Enable voltage fine-tuning function (if necessary)

5、 Network Communication and Remote Monitoring

5.1 LonWorks Network Configuration

The DSLC control system uses Echelon's LonWorks technology for inter device communication, supporting load distribution, reactive power/power factor distribution, and dead bus closure permission management.

Network specifications:

Data rate: 1.25 Mbps

Network isolation: 1000Vrms (60 seconds) at 60Hz, 277Vrms (continuous)

Common mode range: 277Vrms

Electrostatic discharge: 15kV

Maximum number of nodes per bus: 64 (0 to+70 ° C), 32 (-20 to+85 ° C), 20 (-40 to+85 ° C)

Network bus length: 500m (-20 to+85 ° C), 150m (-40 to+85 ° C)

Maximum stub length: 300mm (-40 to+85 ° C), 600mm (0 to+70 ° C)

Network terminal: Terminals need to be installed on both ends of the network

Wiring requirements:

Use the recommended shielded twisted pair cable

Ensure that the bus length is less than 500m

The length of the stub is less than 300mm

Less than 32 network devices

Minimize exposed wires outside the shielding layer

Verify the shielding continuity of the entire network

Grounding shielding layer at the center position

Install terminals only on both ends of the network

Avoid wiring together with power cords or other high electrical noise circuits

5.2 Remote monitoring function

The DSLC control system provides complete remote monitoring functions through the LonWorks network, including:

Electrical parameter output:

Real time data such as voltage, current, power, and power factor are provided through three data structures (ELEC-PARAOUT1, OUT2, OUT3) with an update rate of 1 second.

Remote control input:

Net_demote_in: Network remote load or process control reference input

Net_decess_in: Network input from LonWorks compatible process transmitters

Net_iscrete_in: Network input from remote sequencer

Discrete input/output states:

The status of all switch inputs and relay outputs can be monitored through the network.

6、 Troubleshooting and Maintenance

6.1 Common problem diagnosis

Unit unable to power on:

Check the+24V power supply

Ensure the correct polarity of the power supply

Check if the software PROM is installed correctly

Unstable load control:

Check phase current and voltage calibration

Adjust the rated speed of the speed control unit

Change the load control mode

Unstable process control mode:

Ensure that the load control is set to proportional control

Dynamically adjust the process control again

Unstable reactive power/power factor control mode:

Dynamically adjust reactive power/power factor control again

Remove cross current compensation from the voltage regulator circuit

Incorrect load allocation during waiting:

Check if the rated load setting is correct

Adjust the rated speed of the speed control unit

6.2 Network Troubleshooting

The number of DSLCs in the activity is incorrect:

Check if all DSLC controlled network addresses are unique

Verify whether the network cabling complies with specifications

Check the impact of each DSLC control on the network one by one

Network communication error:

Check if the network cabling installation complies with the specifications

Verify if the network is overloaded

Check if there are any equipment malfunctions affecting network communication

6.3 Service Options

Woodward offers a variety of product and service options:

OEM and packager support: Obtain services through original equipment manufacturers or device packagers

Woodward Business Partner Support: Obtain services through a global network of independent business partners

Factory repair options: including replacement/exchange, uniform rate repair, and uniform rate remanufacturing

Return to equipment maintenance:

Contact the full-service distributor in advance to obtain return authorization and shipping instructions

Attach a label containing complete information when transporting goods

Packaging control equipment according to specifications to prevent transportation damage

7、 Safety precautions

7.1 Warning and Notice

Important definition:

Danger: Indicates a dangerous situation that, if not avoided, may result in death or serious injury

Warning: Indicates a dangerous situation that, if not avoided, may result in death or serious injury

Attention: Indicates a dangerous situation, which may result in minor or moderate injury if not avoided

Notice: Indicates the potential danger of property damage

Important: Specify operation prompts or maintenance suggestions