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External bypass soft starter PQZR8-SP

The PQZR8-SP intelligent External bypass soft starter is a new intelligent starting device with international advanced level, which is based on microprocessing as the core, combined with technologies such as controllable silicon power drive, software and hardware protection, menu LED display, keyboard operation, torque control, and fuzzy PID closed-loop algorithm. It integrates motor soft start, soft stop, light load energy-saving, and multiple functions.
This device has complete functions, stable performance, and is widely used in the start-up process of transmission equipment, fans, slurry machines, compressors, and other loads. Designed for three-phase AC squirrel-cage induction motors operating at 320V to 460V, 50/60Hz, with a rated current of 1200A or less.

External Bypass soft Starter – Parameters

+ Power Range: 11kW~630kW
+ Voltage Input: 3ph x380~415
+ Voltage output: 3ph x380~415
+ Rated Current: 22A~1200A
+ Current Frequency: 50~60Hz (±2%)
+ Soft Starting Rise Time: 2~60s
+ Soft Stop Time: 2~60s
+ Current Limiting Multiple: 1.5~5.0 Ie
+ Initial Voltage: 30%~70% Ue
+ Cooling Method: Natural Cooling / Convection Cooling
+ Communication Method: RS485 Serial Communication
+ Acceleration time, s 1-120
+ Starting voltage 30-80%
+ Starting torque limitation 20-400%
+ Maximum operating current 50-200%
+ Protection class:IP20
+ Starts per hour: ≤ 15 times/hour

Features

▌External Bypass Soft Starter Advanced Features:

  • Reduced Motor Stress,Minimizes mechanical stress on the motor during startup and stopping.
  • Enhanced Motor Life,Protects the motor from damage caused by inrush currents and voltage spikes.
  • Improved Energy Efficiency, Optimizes motor operation for energy savings.
  • Reliable Operation, Ensures consistent and reliable performance.
  • Easy Installation and Maintenance, Simple to install and maintain.

▌External Bypass Soft Starter Characteristics:

  • Modular Design:
    Requires additional components like circuit breakers (for short-circuit protection) and AC contactors (for bypassing) to be installed within the cabinet, along with switches to complete the motor control circuit.
  • Advanced Motor Protection:
    Eliminates the need for thermal relays by providing comprehensive motor protection during startup and operation.
  • Closed-Loop Control:
    Ensures smooth and reliable soft starts and stops, improving motor performance and reliability.
  • Low Power Consumption:
    Utilizes a bypass contactor during normal operation, minimizing power consumption and enhancing system efficiency.
  • Intelligent Control:
    Features advanced control algorithms for precise motor control.
  • Versatile Starting Modes:
    6 Start  and 2 Stop Mode

▌Protection Function:

☑Phase Loss Protection:
When any one of the three phases is open-circuited, the protection action time is less than 1 minute.
☑Phase Imbalance Protection:
When the three-phase imbalance K1 or K2 is greater than 10%, the protection action time is less than 10 minutes.
☑Overcurrent Protection:
When the motor is stalled, the protector operates with a delay of (±1s).
☑Overvoltage Protection:
When the power supply voltage Ue > 120%, the protection action time is less than 1 second.
☑Undervoltage Protection:
When the power supply voltage is (60%-75%) Ue, the protection action time is less than 60 seconds.
☑Reset Function:
Manual reset via the stop button.
☑Overtemperature Protection:
When the soft starter operates at an excessive temperature, the soft starter will automatically shut down and report a soft start overheat fault.

▌Application Range:

  • Fluid Handling (Pumps & Fans):
    Used in water treatment, HVAC, and industrial ventilation to minimize mechanical stress and improve energy efficiency during startup.
  • Material Transport (Conveyors & Belt Drives):
    Ensures gradual motor speed increase, reducing equipment wear and enhancing operational efficiency.
  • Compression Systems (Compressors):
    Reduces inrush current and mechanical stress in air conditioning, refrigeration, and industrial compressor applications.
  • Mixing & Agitation (Mixers & Agitators):
    Provides smooth, controlled startups in food processing, chemical facilities, and wastewater treatment, minimizing vibration and improving efficiency.
  • Size Reduction (Crushers & Mills):
    Used in mining, cement, and aggregate processing to decrease mechanical stress and enhance energy efficiency.

▌Environmental requirements:
If the altitude exceeds 1000 meters, the capacity should be reduced accordingly. For every 100 meters increase above 1000 meters, the current should be reduced by 0.5%; The relative humidity should not exceed 95% when the ambient temperature is between -10 ℃ and+40 ℃; No condensation, no flammable and explosive gases, no conductive dust, in a well ventilated indoor environment

Specifications

Item item Item Description
Input Power Supply Input Voltage Three Phase 380V-15% ~ 415+10%   50/60Hz
Adaptive Motor Squirrel-cage three-phase asynchronous motor
Starting Times It is recommended not to exceed 15  times per hour.
Control Mode 1) Operation panel control;
2) Operation panel + external control;
3) External control;
4) External control + COM control;
5) Operation panel + external + COM control;
6) Operation panel + COM control;
7) COM control;
8) No start or stop operation.
Start Mode 1) Current-limiting start;
2) Voltage ramp start;
3) Kick start + current-limiting start;
4) Kick start + voltage ramp start;
5) Current ramp start;
6) Voltage current-limiting double closed-loop start.
Stop Mode 1) Soft stop;
2) Free stop.
Protective Function 1)Open loop protection for external instantaneous stop terminals;
2) Over-heat protection for soft starter;
3) Protection for too long starting time;
4) Input open phase protection;
5) Output open phase protection;
6) Unbalanced three-phase protection;
7) starting over current protection;
8) Running overload protection;
9) Under voltage protection for power voltage;
10) Over voltage protection for power voltage;
11) Protection for fault parameter setting;
12) Load short circuit protection;
13) Auto restart or incorrect wiring protection;
14) Incorrect wiring protection of external control stop terminals.
Ambient Structure Place to be used Indoor location with good ventilation free from corrosive gas and conductive dust.
Altitude Below 3000M. It have to rise the rate power when the altitude is more than 3000M.
Ambient Temperature  -30~+55ºC
Ambient Humidity ≤90%RH without dew condensation.
Vibration <0.5G
Protection Class IP20
Cooling Pattern Natural wind cooling.

Model Table

Model No# Rated Current Maximum Adaptable Motor Power bypass contactor Circuit Breaker Main Wiring Specifications
(A) (KW) Model Model
PQZR8-SP11-T4 22 11 CJX2-32 NXB-40 10mm2 Copper wire
PQZR8-SP15-T4 30 15 CJX2-32 NXB-40 10mm2 Copper wire
PQZR8-SP18.5-T4 37 18.5 CJX2-40 NXB-50 10mm2 Copper wire
PQZR8-SP22-T4 45 22 CJX2-50 NXB-63 16mm2 Copper wire
PQZR8-SP30-T4 60 30 CJX2-63 NXB-80 25mm2 Copper wire
PQZR8-SP37-T4 76 37 CJX2-95 NXB-100 35mm2 Copper wire
PQZR8-SP45-T4 90 45 CJ20-100 NXB-125 35mm2 Copper wire
PQZR8-SP55-T4 112 55 CJ20-160 NXB-160S 35mm2 Copper wire
PQZR8-SP75-T4 150 75 CJ20-160 NXB-180S 50mm2 Copper wire
PQZR8-SP90-T4 180 93 CJX20-250 NXB-200S 30×3 Copper busbar
PQZR8-SP110-T4 220 110 CJX20-250 NXB-250S 30×3 Copper busbar
PQZR8-SP132-T4 260 132 CJX20-400 NXB-315S 30×4 Copper busbar
PQZR8-SP160-T4 320 160 CJX20-400 NXB-350H 30×4 Copper busbar
PQZR8-SP185-T4 370 185 CJX20-400 NXB-400H 40×4 Copper busbar
PQZR8-SP200-T4 400 200 CJX20-400 NXB-500S 40×4 Copper busbar
PQZR8-SP220-T4 440 220 CJX20-630 NXB-500H 40×4 Copper busbar
PQZR8-SP250-T4 500 250 CJX20-630 NXB-630S 40×4 Copper busbar
PQZR8-SP280-T4 560 280 CJX20-630 NXB-630H 40×4 Copper busbar
PQZR8-SP315-T4 630 315 CJX20-630 NXB-700H 40×5 Copper busbar
PQZR8-SP350T4 700 350 CJ40-800 NXB-800H 40×6 Copper busbar
PQZR8-SP400-T4 800 400 CJ40-800 NXB-1000S 40×6 Copper busbar
PQZR8-SP450-T4 900 450 CJ40-1000 NXB-1250S 40×8 Copper busbar
PQZR8-SP500-T4 1000 500 CJ40-1000 NXB-1600S 40×8 Copper busbar
PQZR8-SP630-T4 1200 630 CJ40-1200 NXB-2000S 40×8 Copper busbar

Installation Dimension

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