Description
Product Core Brief
- Model: PSTX570-600-70, OEM ID 1SFA898117R7000
- Brand: ABB
- Series: PSTX Advanced Soft Starter Range
- Core Function: Three-phase thyristor soft starter delivering controlled torque/voltage ramp start/stop, integrated bypass contactor, and full motor protection for heavy-duty pumps, fans and compressors.
- Product Type: High-Current Industrial Solid-State Soft Starter
- Key Specs: 570A continuous rated | 208–600 VAC main circuit | 100–250 VAC control supply
- Note: Active OEM production; factory sealed new units and load-tested surplus stock available for industrial cabinet retrofits.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Main Circuit Voltage Range | 208–600 VAC, 50/60 Hz |
| Rated Continuous Operational Current | 570 A (in-line wiring); up to 987 A inside delta |
| Equivalent Motor Power (400 VAC In-Line) | 315 kW |
| Control Supply Voltage | 100–250 VAC, 50/60 Hz; internal 24 VDC logic supply |
| Integrated Hardware | Built-in mechanical bypass contactor, coated PCB |
| Control Algorithm Modes | Voltage ramp start/stop; torque ramp start/stop; kickstart; pump cleaning; jog; standstill brake |
| Current Limiting Modes | Standard, dual, ramped current limit (1.5–7.5× Ie) |
| Protection Functions | Electronic overload (Class 10), locked rotor, phase imbalance, phase reversal, earth fault, PTC/PT100 motor thermal, underload, over/undervoltage, heatsink overtemperature |
| Onboard Communication | Native Modbus RTU RS485; expandable via Anybus FieldBusPlug adapters |
| Analog Output | Configurable 0–10 V / 0–20 mA / 4–20 mA for current, voltage or power factor |
| Relay Outputs | Run, bypass, fault, overload, event alarm (NO contacts) |
| User Interface | Detachable graphical keypad, IP66 panel mount rated, 17 built-in display languages |
| Operating Ambient Temp | -25 °C to +60 °C (derate above 40 °C) |
| Storage Temperature | -40 °C to +85 °C |
| Enclosure Rating | Main unit IP00; detachable keypad IP66 Type 4X |
| Physical Dimensions | 493 mm H × 361 mm W × 282 mm D |
| Net Weight | 25 kg |
| Compliance Standards | UL508A, CE, RoHS, IEC 60947-4-2 |
| Wiring Options | Standard in-line connection; inside delta (6-lead motor) compatible |
Product Introduction
This heavy-duty soft starter regulates stator voltage via three-phase thyristor stacks to eliminate high inrush current during motor startup, paired with a factory-integrated bypass contactor that shunts semiconductors once full speed is reached to cut steady-state heat generation. It eliminates the need for separate external bypass hardware common on smaller soft starter models.
All motor and network fault protection logic is embedded onboard, removing requirement for auxiliary thermal relays. The detachable door-mounted keypad allows remote parameter tuning and fault log review without opening the MCC cabinet live.
QA & Testing SOP (Transparency Building)
- Incoming Inspection: Cross-reference serial and 1SFA order codes against OEM registry to reject counterfeit units; inspect main circuit terminal lugs, heatsink surface, keypad connector and PCB coating for shipping dents or moisture residue; log full serial numbers and batch codes for traceability.
- Live Testing: Mount unit to steel test frame, connect 600VAC programmable power supply and 570A resistive load bank, run continuous 24-hour cyclic start-stop sequencing with bypass contactor activation; validate Modbus RTU tag read/write stability.
- Electrical Testing: Use Fluke 115 multimeter and insulation tester to verify chassis ground resistance below 0.5Ω and PCB insulation resistance above 10MΩ between main power and low-voltage control circuits.
- Firmware/Config Backup: Record exact embedded firmware revision via keypad diagnostic menu, export full motor parameter set to offline storage, photograph factory default DIP switch and address jumper positions for Modbus communication.
- Final QC & Packaging: Wipe heatsink and PCB surfaces with anti-static solvent, separate detachable keypad into individual static shielding bag, attach printed QC test tag with technician ID and runtime test timestamp before foam-lined wooden crate packaging for heavy unit transit.
Installation Pitfalls & Guide (Engineer to Engineer)
❗ Incorrect Inside Delta Wiring: Cross-swapping T1/T2/T3 motor leads during delta connection creates permanent phase imbalance trips; label each motor terminal before disassembly and cross-reference wiring diagram.❗ Control Supply Voltage Mismatch: Feeding 24VDC direct to the 100–250VAC control power terminals burns internal control board transformers; only use internal 24V logic for digital input circuits.❗ Bypass Contactor Timing Misalignment: Improper parameter ramp delay causes simultaneous thyristor and bypass conduction, leading to SCR overcurrent failure; verify factory default bypass delay before commissioning.❗ Insufficient Cabinet Ventilation: Continuous 570A operation generates high heatsink heat; minimum 150mm top/bottom clearance required to avoid overtemperature faults.❗ ESD & Thermal Surface Damage: Bare hand contact with exposed thyristor heatsink contact surfaces ruins thermal transfer; field records show ungrounded handling caused SCR short failures costing $5,200 in hardware and process downtime.
4-step replacement guide:
- Pre-install: Lock out upstream main breaker, confirm zero voltage with multimeter, fit anti-static wrist strap, photograph main circuit lug wiring, control cable routing and Modbus terminal connections.
- Removal: Unfasten heavy main circuit torque bolts, disconnect all low-voltage control relays, analog and communication wiring, unbolt frame mounting brackets and slide the unit out of MCC cabinet.
- Install: Secure new unit to cabinet frame to manufacturer torque specs, replicate original main and control wiring, set matching Modbus node address and motor ramp parameters.
- Power-on Test: Restore cabinet power, run manual single start-stop cycle, confirm bypass contactor engages without fault, read steady-state motor current via analog output and validate remote Modbus control from PLC.
FAQ (Frequently Asked Questions)
Q: What is the difference between in-line and inside delta wiring for this unit?A: In-line wiring carries full motor current through the soft starter, rated 570A continuous. Inside delta splits phase current across two thyristor legs, allowing the unit to handle up to 987A motor loads; motor must have accessible six winding terminals for delta configuration.
Q: Can the unit operate without connecting the integrated bypass contactor?A: Operation is possible but not recommended. Continuous thyristor conduction creates excessive heatsink heat, triggering frequent overtemperature trips and shortening semiconductor service life; OEM mandates bypass activation for steady-state running loads.
Q: What warranty coverage applies to stocked units?A: Factory-new OEM soft starters carry a 12-month manufacturer warranty covering thyristor stacks, bypass contactor and control logic. Bench load-tested surplus units ship with a 6-month functional warranty; damage from miswiring, overcurrent or inadequate ventilation voids coverage.
Q: Has ABB issued an official EOL notice for this model?A: No formal end-of-production notice exists; OEM maintains active production for large pump, fan and compressor MCC projects and plant maintenance spare demand.
Q: Can motor parameter sets be copied between identical units?A: Yes. Store full configuration files to the detachable keypad memory via the backup menu; detach and plug the keypad into the replacement unit to upload all ramp, protection and communication settings without manual re-entry.
Q: Does this soft starter support hot swapping during live motor operation?A: Hot-swapping is fully unsupported. The unit carries full line voltage on main circuit terminals; partial disconnection creates arcing hazards and instant motor shutdown. Full upstream lockout/tagout is mandatory for replacement.
Q: What fieldbus adapters are compatible with the onboard Modbus expansion slot?A: Valid Anybus FieldBusPlug modules include Profibus DP, DeviceNet, Ethernet/IP and Profinet IO adapters. Verify the OEM PSTX hardware compatibility datasheet for maximum communication baud rate and PLC telegram mapping limits.
