MSS soft start module
1. Product introduction
1.1 General
MSS HV modularized solid soft starter which integrates thyristor components, bypass vacuum switch, trigger control system. This product has compact structure and independent soft start function.
Its working principle is to control the value of output voltage by adjusting the triggering angle of thyristor, and to meet various current and voltage requirements during motor start process. After the motor reaches normal speed, the bypass switch be closed which means the starting process is finished. MSS HV modularized soft starter will provide running protection to the motor.
The structure of this starter is similar to HV vacuum circuit breaker and it fits the KYN28 cabinet perfectly. MSS can upgrad the traditional HV switch cabinet to a device with both switch and soft start functions. Its performance can completely meet users’ requirements.
1.2 Range of application
MSS HV modularized solid soft starter is applicable for voltage reduction soft start of various large and medium HV motors.
Applicable motor range:
Voltage: 3.6/7.2/12KV
Power: 200~2000KW
Frequency: 50HZ/60HZ ± 2HZ
Phase sequence: works if input and output phase sequence is identical
Motor type: 3 phase HV AC motor
1.3 Features
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Structure |
Soft start module |
Patented thyristor serial-parallel pressure contact technology, integrated together with vacuum switch components to make compact structure. |
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Power source module |
Unique switch closing control circuit, reliable and small. |
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Control module |
Highly integrated main control panel with various interface drew out by standard VS1 aviation plug, convenient for wiring and maintenance. |
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Electrical |
Reliable control system |
Control system has passed strict EMC electromagnetic compatibility test which shows the strong anti electro-magnetic interference performance. |
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Various control plan |
Smoothly start the motor by measuring starting current and negative feedback control the triggering angle of thyristors. It has various start control mode with optional coast stop or soft stop function. |
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Touch screen display |
Comprehensive display content, convenient to operate |
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Customized protection function |
Multiple grade protection function, customized start and running protection settings. |
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Low power consumption closing coil |
Adopting patented power source control technology, compared to traditional contactor it has removed divider resistance, significantly reduced power consumption. |
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Advanced triggering system |
Adopting patented triggering technology, good pulse consistency and insulation |
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System communication function |
RS-485 communication port integrated (communication protocol Modbus and Porfibtjs optional). Direct connection to superior PC through this port can realize remote control and signaling functions |
2. Technical parameters
2.1 working principle
Following is the principle diagram of modularized soft starter:
To equip MSS, the soft starter device can be designed according to following diagram:
Typical scheme 1: operating cabinet + start cabinet
Typical scheme 2: 2-in-1 single cabinet
Scheme sketches:
Typical scheme 1 Typical scheme 2
Scheme 1: two standard KYN28 (800 type) cabinets, connected with other switch cabinets, large room for convenient wiring and maintenance.
Scheme 2: one standard KYN28 (800 type) cabinets, connected with other switch cabinets, compact structure, saving a cabinet.
2.2 Main technical parameters
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Rated voltage |
6kV、10kV |
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Bypass rated current |
630A |
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Applicable motor current |
0~100A |
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Applicable motor power |
For 10kV below 1600kW/ for other rated voltage depends on motor current |
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Motor type |
3 phase squirrel cage or winding motor, asynchronously started synchronous motor |
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Rated working frequency |
50HZ/60HZ±2HZ |
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Phase sequence |
Working in any phase sequence allowed |
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Control power |
AC220V ± 10% |
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Operation panel |
480*272 touch screen |
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Power frequency withstand voltage |
25kV (phase to ground) |
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Cooling method |
Forced air cooling |
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Starting times |
Ambient temperature 25℃ and rated current below 100A, starting times≤4次 per hour, minimum starting interval 10 minutes |
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Starting protection |
Over current, over voltage, under voltage, current imbalance, starting over time protections; bypass vacuum switch closing fault detect; |
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Running protection |
Over current, over voltage, under voltage, current imbalance, starting over time protections; bypass vacuum switch closing fault detect; |
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Start method |
Voltage ramp start, constant time start, current limit start, soft stop |
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Soft start time |
0~100 seconds adjustable |
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Soft stop time |
0~60 seconds adjustable |
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Output voltage |
20%~100% adjustable (by change triggering time) |
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Current limit magnification |
1Ie~5Ie adjustable |
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Communication port |
RS-485 communication port, by default support Modbus protocol, Profibus optional |
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Ambient temperature |
Working:-15℃~+50℃, storage:-25℃~+70℃ |
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Ambient humidity |
≤95% without condensation |
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Altitude |
≤2000 m |
2.3 Type explanation
Specifications:
Table 1: type and applicable motor power
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Type |
Rated voltage kV |
Applicable motor power kW |
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MSS1-500/10 |
10 |
500 |
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MSS1-710/10 |
10 |
710 |
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MSS1-1000/10 |
10 |
1000 |
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MSS1-1250/10 |
10 |
1250 |
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MSS1-1600/10 |
10 |
1600 |
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MSS1-500/6 |
6 |
500 |
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MSS1-710/6 |
6 |
710 |
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MSS1-1000/6 |
6 |
1000 |
3. Order instructions
3.1 Motor type, rated power, rated voltage, rated current, locked-rotor current multiples, starting torque multiples, motor and load moment of inertia, bus bar capacity of short circuit, variation curve of load drag torque;
3.2 Primary schematic diagram, cabinets layout diagram, power distribution room layout diagram, low voltage power source and so on.
For special requirements please communicate with manufacturer.
