Application ScenariosConsider a municipal water pumping station where three 75 kW centrifugal pumps are started via ABB PSS soft starters to prevent water hammer and reduce inrush current. After 15 years of service, one PSS unit fails to initiate—the RUN LED stays dark and the thyristors never fire—traced to a failed control board. Rather than replacing the entire soft starter (with associated rewiring, panel modification, and downtime), the maintenance team installs a tested ABB 5366268-B control board into the existing PSS housing. The three potentiometers (start ramp 1–30 s, initial voltage 30–70 %, current limit 1.5–4 × Ie) remain preset on the front fascia; the new board reads those settings automatically. Within minutes the pump soft-starts smoothly at the next cycle, eliminating water hammer and protecting the motor windings. This scenario illustrates how the 5366268-B solves the critical pain point of extending the life of proven PSS installations at a fraction of full-unit replacement cost.h2
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 5366268-B |
| Manufacturer | ABB (for PSS Series Soft Starters) |
| Product Category | Soft Starter Internal Control / Trigger Board (PCB Assembly) |
| Applicable Series | ABB PSS Compact Soft Starters (PSS18…PSS300 inline; PSS30…PSS515 inside-delta, subject to PSS variant) |
| Control Supply (from PSS mains) | 110–120 V AC or 220–240 V AC (50/60 Hz) — derived from soft starter main supply |
| Main Circuit Compatibility | 208–690 V AC three-phase |
| Start Ramp Setting | 1 – 30 s (set via front pot on PSS fascia, processed by board) |
| Stop (Soft) Ramp Setting | 0 – 30 s (controlled by board logic) |
| Initial Voltage Adjust | 30 % – 70 % of line voltage (potentiometer input read by board) |
| Current Limit Range | 1.5 × Ie – 4 × Ie motor FLC (external CT optional for PSS) |
| Bypass Contact Output | Relay drive signal for integral or external bypass contactor |
| Protection Features | Overload (via electronic OL relay in PSS), phase loss detection, thyristor misfire supervision |
| Operating Temp. (ambient inside enclosure) | -20 °C to +60 °C |
| Mounting | Secures inside PSS soft starter enclosure via factory standoffs & ribbon/card-edge connectors |
*Note: This is an internal spare part — exact PSS frame size compatibility should be verified against the host unit’s rating plate before ordering.h2 Technical Principles and Innovative ValuesThe 5366268-B is purpose-designed as the analog/digital hybrid brain of the PSS compact soft starter.
- Innovation Point 1 – Integrated Thyristor Firing & Ramp Control: The 5366268-B generates phase-angle-controlled gate pulses for the three pairs of anti-parallel SCRs. It linearly increases the conduction angle over the user-defined start ramp (1–30 s) to raise motor voltage from the initial setting (30–70 %) to full line voltage, then issues a bypass command—ensuring smooth acceleration and minimal starting current spike.
- Innovation Point 2 – Built-in Current Limiting via External CT Input: When an external current transformer is connected to the PSS, the 5366268-B continuously monitors motor current and dynamically reduces thyristor firing angle if the current exceeds the preset limit (1.5–4 × Ie). This prevents nuisance tripping on high-inertia loads while protecting both motor and supply network.
- Innovation Point 3 – Drop-In Replacement with Zero Recalibration: The 5366268-B reads start/stop ramp and voltage/current settings directly from the PSS front-panel potentiometers and DIP switches via its onboard ADC channels. Swapping a faulty board does not require entering parameters into software—the replacement inherits the existing configuration instantly, drastically reducing mean time to repair (MTTR).
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