8239-026 - Woodward Digital Speed Matching (DSM) Synchronizer module

TECHNICAL SPECIFICATIONS:

Part Number: 8239-026
Manufacturer: Woodward
Product Type: Digital Speed Matching (DSM) Synchronizer
Supply Voltage Input: 115 / 230 VAC (Switch-Selectable) or 18–32 VDC Nominal
Voltage Matching Accuracy: 1.0% of Nominal Bus Voltage
Phase Angle Lock Window: Configurable from $1 to $10
Operating Frequency Spectrum: 45 Hz to 65 Hz (Applicable for 50/60 Hz Systems)
Frequency Dynamics Window: 10 Hz to 10,000 Hz MPU Input Capability
Relay Output Interfaces: Dry-Contact Isolated Control Relays (Speed Raise/Lower, Breaker Close)
Output Contact Capacity: 5 A at 28 VDC / 120 VAC Resistive
Enclosure Architecture: Enclosed Flanged Chassis/Panel Mount Sheet Metal Box
Operating Temperature Range: -40°C to +70°C (-40°F to +158°F)
Relative Humidity Threshold: 95% Non-condensing
Repair Time: 3-5 Days
Availability: In Stock
Weight: 1.73 kg (3.81 lbs)
Country of Origin: United States

FUNCTIONAL DESCRIPTION FOR 8239-026:

The Woodward 8239-026 is a Digital Speed Matching (DSM) Synchronizer Module designed and manufactured to automate the precise paralleling of generator sets to a common utility busbar or grid network. Working in close tandem with the primary electronic governor, this autonomous module continuously evaluates the differences in phase angle, frequency, and voltage amplitude between the incoming generator line and the live busbar. It processes high-frequency mathematical telemetry to coordinate the exact instant the generator breaker can be safely closed, preventing catastrophic mechanical stress and reverse-power grid faults.

RE-ENGINEERED VOLTAGE & FREQUENCY FRONT-END

The input network utilizes isolated voltage potential transformer (PT) loops to read the real-time sine wave forms of both the running bus and the approaching generator. These analog profiles pass directly into internal high-speed zero-crossing detector chips and active hardware filters that strip out high-frequency harmonic distortion, commutator ripple, and line slot noise. By producing clean square waves representing real-time frequency, the front-end provides stable synchronization calculations even on highly distorted industrial grids.

PHASE CALCULATION MATRIX & AUTOMATIC BREAKER DRIVERS

The conditioned square-wave pulses map into a central processing block that determines the dynamic phase slip velocity between the two electrical networks. While evaluating this phase drift vector, the module toggles isolated speed-adjust relays to trim the primary governor until the generator and bus drift toward an exact phase lock. When the phase delta closes within the user-set window (down to $1^{circ}$) and approaches the absolute zero-degree mark, the synchronizer drives an on-board high-speed circuit breaker command relay to parallel the systems seamlessly.

WHY BUY FROM WOC

World of Controls delivers meticulously certified legacy component renewals to safeguard critical prime mover systems. Every 8239-026 DSM module undergoes intensive simulation on our custom multi-source grid test benches, which validates line/bus voltage tracking accuracy down to checks contact latency across all speed-trimming relays under full inductive loads, and verifies breaker trip logic timing. We carry immediate inventory allocations in UNUSED and REBUILT profiles to keep your plant infrastructure running uninterrupted.

FREQUENTLY ASKED QUESTIONS

What is the Woodward 8239-026?

The 8239-026 is a Digital Speed Matching (DSM) Synchronizer designed to automatically parallel a generator with a live bus or utility grid. It evaluates the voltage, frequency, and phase angle differences between the two power sources to adjust engine speed via the governor loop. Once the sources are perfectly matched, it safely pulses a command relay to close the main breaker.

How do the 8239-026 balance voltage values look before paralleling?

The module monitors the potential transformers of both the generator and the live busbar via isolated analog front-end circuits. It automatically determines if the generator's output is within a tight window of the running bus configuration. If the values diverge, it issues proportional correction outputs to the automatic voltage regulator (AVR) until alignment is achieved.

What parameters are adjusted using the internal dip-switches and potentiometers?

Operators configure the allowable phase angle lock window, line-to-bus voltage tolerance limits, and breaker closure lead time. The multi-turn potentiometers allow high-resolution adjustments to the speed-biasing gain. This ensures matching pulses match the acceleration dynamics of your prime mover without overshooting.

How does the module compensate for the mechanical closing delay of a massive circuit breaker?

The synchronizer includes an adjustable breaker-time compensation potentiometer that projects ahead based on the calculated phase slip velocity. Instead of pulsing the relay at exactly zero degrees, it fires the contact early by a margin equal to the breaker's closing window. This anticipatory timing ensures the breaker main contacts physically lock shut at the exact moment of zero-degree phase coincidence.