Application Scenarios
In a municipal water pumping station, three 75 kW centrifugal pumps rely on ABB PSS soft starters to prevent water hammer and reduce inrush current during daily start/stop cycles . 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 front-panel potentiometers (start ramp 1–30s, initial voltage 30–70%, current limit 1.5–4×Ie) remain preset; the new board reads these settings automatically . Within minutes the pump soft-starts smoothly, eliminating water hammer and protecting motor windings. This scenario illustrates how the ABB 5366268-B solves the critical pain point of extending the life of proven PSS installations at a fraction of full-unit replacement cost .
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | ABB 5366268-B |
| Manufacturer | ABB (Low Voltage Products – Drives & Soft Starters) |
| Product Category | Soft Starter Internal Control / Thyristor Trigger PCB |
| Applicable Series | ABB PSS Compact Soft Starters (PSS18 to PSS300 inline; PSS30 to PSS515 inside-delta) |
| Main Circuit Compatibility | 208 – 690 V AC, three-phase |
| Control Supply Voltage | 110–120 V AC or 220–240 V AC, 50/60 Hz (derived from PSS mains) |
| Start Ramp Setting | 1 – 30 seconds (via front potentiometer) |
| Stop Ramp Setting | 0 – 30 seconds |
| Initial Voltage Adjustment | 30% – 70% of line voltage |
| Current Limit Range | 1.5×Ie – 4×Ie motor FLC (requires external CT) |
| Gate Drive Outputs | 6 isolated SCR gate-drive signals (to 3 inverse-parallel thyristor pairs) |
| Status Outputs | RUN, READY, FAULT LEDs; bypass/fault relay drive signals |
| Operating Temperature (ambient) | -20°C to +60°C |
| Protection Class (installed) | IP20 (per PSS enclosure rating) |
| Mounting | Secures inside PSS enclosure via standoffs & multi-pin header/ribbon connector |
Technical Principles and Innovative Values
The ABB 5366268-B is purpose-designed as the analog/digital hybrid brain of the PSS compact soft starter, delivering reliable motor control through several key innovations.
Innovation Point 1 – Integrated Thyristor Firing & Ramp Control. The ABB 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 (1–30s) 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, the ABB 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—a feature that competitors in the same price tier often lack .
Innovation Point 3 – Drop-In Replacement with Zero Recalibration. The ABB 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 requires no software parameter entry—the replacement inherits the existing configuration instantly, dramatically reducing mean time to repair (MTTR) compared to programmable soft starters that require full re-commissioning .
Innovation Point 4 – Comprehensive Protection Logic. Beyond ramp control, the ABB 5366268-B monitors for phase loss, undervoltage, overvoltage, overload, and SCR short detection (in conjunction with the power board) . It drives the fault signal relay (configurable as NO or NC per PSS variant) to alert upstream control systems, integrating seamlessly with PLC/DCS architectures .
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