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Low Voltage Starters

Low Voltage Starters

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Product Description

Low Voltage Starters 

The PST(B) softstarter is the most advanced softstarter in the
ABB product portfolio and is equipped with almost all imaginable
features. This makes the PST(B) ideal for almost every

Torque Control
The ABB torque control function is developed together with
pump manufacturers to ensure the best possible pump stop,
eliminating problems with water hammering and pressure surges.

By-pass for energy saving
By-passing the softstarter after reaching full voltage, will save
energy and reduce the heat generaton. The PST softstarters
are equipped with extra terminals making the connection of an
external by-pass contactor easier and allowing all protections
to be active during by-pass. On the PSTB softstarters, an ABB
AF-contactor is already built-in, ensuring a compact starting
solution with minimal wiring during installation.

Advanced protections
The PST(B) softstarters are equipped with almost all protections
imaginable for protecting the motor, the softstarter and
the application. To offer more flexibility, all protections can be
tailored to your specific needs.

Flexible analog output
The analog output terminals can be connected to an analog
current meter to show the current during operation and thereby
eliminating the need for an additional current transformer. The
analog output signal can also be used as an analog input to a

Fieldbus communication
Using the ABB FieldBusPlug, all the most common fieldbus
protocols are supported. Using the PLC system it is possible
to set-up the softstarter, read status information and also to
control the softstarter.

Display and keypad
The PST(B) softstarter is equipped with a full text display showing
all information in clear text in your own language. To make
it even easier to set-up, there are standard settings for many
common applications, such as centrifugal pump. Selecting this
will automatically provide all required settings including torque
control when stopping.

External keypad
As an option, the PST(B) softstarter can be equipped with an
external keypad for easy set-up and monitoring of the unit without
opening the enclosure door. The keypad can also be used to copy parameters between different softstarters.

• Wide rated operational voltage 208 – 690 V AC
• Wide rated control supply voltage 100 – 250 V, 50/60 Hz
• Rated operational current 30 to 1050 A (Up to 1810 A inside delta)
• Both in line and inside delta connection
• Coated circuit boards available, for reliable operation even in harsh
• Full text display in 14 languages and 4 button keypad for easy set-up
and operation
• Optional external keypad, IP66
• Built-in by-pass contactor on PSTB (from 370 A) for energy saving
and easy installation
• Prepared for external by-pass on PST (30 – 300 A)
• Torque Control for excellent control of pumps
• Current limit, adjustable between 1.5 – 7 x Ie
• Fieldbus communication using Profibus, Modbus, Devicenet or CANopen
• Dual motor overload protection with classes 10A, 10, 20 and 30
• Adaptable motor underload protection to detect pumps running dry
• Adaptable locked rotor protection to detect jammed pumps
• PTC protection to protect the motor from overheating
• Adjustable kick start to start jammed pumps
• Programmable output signal relays
• Programmable pre-warning functions
• Event log with time stamp
• Analog output showing current, voltage, power factor etc. 0 – 10 V,
0 – 20 mA, 4 – 20 mA

Super Electrical Co.

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