VKS8000
Candidate with built-in bypass and advanced start/stop options; selection is based on motor FLA and starting duty, not motor kW alone.
Open technical pageAdvanced process soft starter
ABB PSTX and Veikong VKS8000: advanced soft-starter comparison
Compare PSTX and VKS8000 for pumps, fans, compressors, conveyors and crushers by current, bypass, torque control, protection, fieldbus and thermal duty.
Short answer
What does this page recommend?
A technical alternative, not a drop-in substitute
VKS8000 can be a candidate for process motors requiring built-in bypass and advanced start/stop. PSTX's 30–1250 A portfolio, pump functions, fieldbus and protection details cannot be matched at series level until verified individually on VKS8000.
Veikong
ProControl products to evaluate first
The exact configuration is selected after engineering review.
VKS6000
More basic soft-starter family; current, duty cycle, bypass architecture and protection scope are verified before design.
Open technical pageTechnical comparison
Similar requirement, different architecture
The table explains product architectures; it is not an exact order-code selection.
| Validation area | ABB PSTX | Veikong / ProControl candidate |
|---|---|---|
| Current and voltage window | ABB publishes a 30–1250 A and 208–690 V scope for PSTX; selection uses motor current and duty. | VKS8000 is selected from its model-current table with standard 380 V and 220/690 V order variants; only the real overlap is used. |
| Bypass and thermal duty | PSTX includes built-in bypass; enclosure heat and starts per hour depend on selected current. | VKS8000 is assessed with its built-in bypass contactor; post-start transition current, contactor life and frequent-start derating are calculated. |
| Pump control | PSTX publishes torque-controlled start/stop and pump functions intended to reduce water hammer. | VKS8000 torque or adaptive start/stop is tuned on the real pipeline; PSTX pump cleaning or special algorithms are not deemed equivalent without evidence. |
| Motor protection | PSTX offers comprehensive protection including overload, underload, locked rotor and temperature. | Each required protection, sensor input, trip class, threshold and reset behaviour is verified individually on VKS8000. |
| Inside-delta and connection | PSTX can provide lower device current with certain connection/topology options; the exact ABB diagram governs. | VKS8000 inside-delta is used only if explicitly supported by the official diagram; otherwise it is sized for line-connection current. |
| Fieldbus and maintenance | PSTX works with Modbus and optional fieldbus, HMI and diagnostic ecosystem. | VKS8000 is assessed with Modbus, LCD, event log and parameter upload/download; other required networks remain gaps until verified. |
Suitable scenario
When is it worth evaluating?
- Pump stations where water hammer must be reduced
- Controlled-current starting on fans, compressors and conveyors
- New process panels requiring built-in bypass and local event logging
Migration gate
Before making a decision
- Document exact PSTX current/voltage code, motor FLA and trip class.
- Calculate starting current, time, starts per hour and bypass thermal duty.
- Build a requirements matrix for pump control, sensors and protections.
- Verify VKS8000 fieldbus, HMI, event log and inside-delta suitability.
- Complete loaded start/stop, water-hammer, stall and sensor-break tests.
Frequently asked
Clear answers about alternatives and migration
Is this a drop-in replacement?
No. It is not a direct substitute until exact model, electrical, protocol-role, mechanical, software and certification checks pass.
What should I provide for selection?
The exact existing code, diagram or I/O list, PLC/network data, supply, environment and special functions in use.
Can PSTX pump-cleaning be assumed to exist on VKS8000?
No. If the same function is not explicitly defined in the current official VKS8000 manual, it must be marked unavailable or unverified.
Official manufacturer sources: ABB PSTX official product page · ABB official softstarter catalogue · Veikong VKS8000 official product page · Veikong VKS8000 official catalogue
This content compares manufacturer-published data under the same project requirement; it does not guarantee direct substitution or project compatibility. ProControl engineering must validate exact model, revision, protocol, electrical, safety and environmental conditions.
Validate the match with an engineer
Share the exact existing code, I/O list, network and environment so we can identify the right solution without assumptions.