QBRG series mine explosion-proof high voltage soft start controller (hereinafter referred to as soft start) includes control module, thyristor module, bypass vacuum contactor. This product is suitable for realizing heavy-load soft start and soft stop of the motor in the environment containing gas (methane) and dust explosion hazard. It has small starting current and stable starting speed. The starting time is adjustable, the impact on the grid is small, and the output torque is large.
The control core of the soft start is the microprocessor CPU. This microprocessor control system can start and protect the motor. The CPU controls the SCR to perform phase angle control to reduce the voltage applied to the motor, and then smoothly increases the motor torque by controlling the voltage and current applied to the motor until the motor accelerates to full speed operation.
This starting method can reduce the starting impact of the motor on the power grid, reduce the impact on the power grid and the motor, and at the same time reduce the impact on the mechanical load device connected to the motor, so as to extend the service life of the equipment and reduce failures and shutdowns.
● Reduce mechanical shock
Eliminate the impact to the system
machinery during the restart and shutdown of the equipment to the greatest
extent, such as reducing the water hammer phenomenon in the water pump system.
● Reduce the impact on the grid
Eliminate the electrical impact of the equipment
on the power grid during the start-up process to the greatest extent, such as
reduced voltage starting and network voltage drop.
The solid-state soft starter uses SCR
non-contact electronic devices. Other types of starter products require
frequent maintenance of resistive fluid and mechanical parts. The solid-state
soft starter turns the mechanical life of the electronic component into the
life of the electronic component, which is basically free of maintenance.
● Emergency work
The machine is equipped with a direct-start
vacuum contactor. When the soft start fails, the vacuum contactor can be used
to directly start the motor to maintain production.
● Simple installation
The device is a complete motor starting
control system, only need to connect the power supply line and the motor line
● Control method
This device has two starting modes: soft
start and straight start. Both remote control and near control are used.
If you need remote control, you only need
to connect the remote control line. This device provides users with two ways of
near control and remote control. The remote control is divided into two-wire control
and three-wire control.
● Display settings
This device provides users with a good
Chinese man-machine interface, which is convenient for debugging and
● Protection and monitoring
The device has built-in motor protection
functions such as overvoltage, undervoltage, unbalanced voltage and current,
overload and stall, phase loss, stall, and overheating.
● Network function
The main control board of this device
integrates communication interface, chooses Profibus, modbus to realize the
communication protocol, and standard RS485 interface.
● Scope of use
This device is suitable for water pumps,
fans, belt conveyors, scraper conveyors, chain drive devices and other
equipment that often needs to be started with heavy loads.
Rated input voltage (V): three-phase AC6KV, AC10KV, 50Hz voltage fluctuation range ±15%;
Voltage fluctuation range: -15～+10% Frequency fluctuation: ±5%
Rated current (A): 150A, 300A, 400A
Main features of communication port
Load type: three-phase asynchronous
squirrel cage motor
Ramp time: 0-60s adjustable
Soft parking time: 0-60s adjustable limit
Stream level: 150-500%
Start mode: voltage ramp start mode,
current limit start mode
Stop mode: free stop, soft stop
Start delay: 0-300s adjustable
Phase sequence: QBRG allows working under
any phase sequence
Stalled-rotor trip time: 0.2-10.0s
Display function: LED Chinese display
Overload capacity: continuous: 125%
controller nominal value
Control mode: two-wire or three-wire system
Communication port: standard RS485
Low-voltage control power supply: 127VAC
(flameproof type for mining)
Insulation grade of electrical department:
20KV (6KV), 35KV (10KV)
Low-voltage electrical part insulation
Electrical life of vacuum contactor:
Mechanical life of vacuum contactor:
Application scope: occasions with explosive
gas and coal dust explosion danger
Altitude: Altitude does not exceed 2000m,
pressure (80～106) Kpa
Ambient temperature: 1. The ambient air
temperature is not more than +40℃, not less than -10℃;
Relative humidity: 2. The ambient air
humidity is not more than 95%±3% (at 25℃±3℃)
Protection function: overvoltage,
undervoltage, overcurrent, overload, overheating, phase loss, zero sequence
protection (leakage), long-time starting protection, etc.
Explosion-proof mark: ExdlMb
Cooling method: natural cooling
Installation method: floor type
Product model description:
Dimensions (D×W×H: 1831×1268×1371)
Note: The left side of the outline drawing
is the main cavity, and the right side is the wiring cavity
Main application scheme:
Application in water pump system
Use soft start to drive the water pump to
start and stop, reduce the impact on the water pump and pipeline during the
start and stop process, reduce the water hammer phenomenon, and extend the
service life of the water pump system. Reduce the impact on the grid.
Fan application scheme
Reduce the redundant torque during starting
and eliminate the mechanical impact of the equipment on the system during
starting and stopping to the maximum extent. Minimize the impact of equipment
restarting the squadron's grid.
Application scheme on belt conveyor
In the belt conveyor, one soft starter can be used to drive two motors, and the PLC control system detects the current of the motor for overcurrent protection. Lower the rollers of the belt conveyor during starting and stopping. The impact of rollers and conveyor belts can prolong the service life of long belt conveyor systems. Reduce the impact on the grid.