Home»Products »Special AC Drive » ALPHA6900 Series Special AC Drive for Crane

ALPHA6900 Series Special AC Drive for Crane

ALPHA 6910V/6920V/6930 series special AC drive integrates the motor driving and lifting logic control. It is devised with professional lifting mechanism and safety logic for wide application range, including sequential coordination and hook-slip prevention functions. Moreover, the original PLC is removed to reduce the potential faults.

It adopts integration design, which eliminates external brake or external brake power as well as the external transmitter in load sensor. The high integration simplifies the system wiring and installation and features accurate control, high safety and reliability with impact less start/brake and stable running.

Furthermore, we offer both construction-elevator dedicated integration scheme and linkage console. The linkage console comprises the wireless-call group control system, floor-selection automatic leveling system, mechanical operation system, and the load-sensor transmitting system. We can provide our venerable customers with perfect solutions.

Technical Characteristics

PG close-loop vector control

Large start torque; rapid dynamic torque response

Vector control running current under load is averagely 10% lower than that of V/F mode.

Safety protections including over-voltage, under-voltage, over-current, overload, and anti-stalling

Overload prediction alarm and speeding under light load; give alarm when the load is higher than set range; allow speeding within specific range when the load is lower than a setup value

Step-less speed regulating; stable running with impactless start/brake

Soft start/stop decreases wear of gear, rack, and brake, extending parts lifetime

Hoisting industry:

Fast adjusting the lifting and landing speed according to the load change even without weight sensor; avoid hook-slip and stalling

Allow over-speed running under hook clearance state; Rated frequency is 50Hz, while it can reach 100Hz at over-speed running

Wind speed surpassing prevention; detect wind speed surpassing signal and give command to stop running

Examination of torque at brake-release and brake-contracting; strict timing sequence of up-travel, down-travel, stoppage, brake-release and brake-contracting

Construction crane:

Load limit function; Stop running when the load is over the defined value to make sure the mechanical system safety

Integrated leveling function; After the floor is selected, the floor leveling is automatically carried out to save positioning time.

Wireless call group control; Sequence the calling floors to avoid their interference with each other

Wide screen LCD display; blue background light adjustable; clear display of white characters; monitoring parameters can be selected

Special large keys suitable for workers is comfortable and with fast response.

Extension wire of keyboard can directly connected to control table, which is convenient for parameter setting and self-learning of floor height and loads.

One-stop service providing systematic digital control solution for crane, including crane dedicated inverter drive, wireless calling device, LCD displayer, floor selection device, load sensor, and speed sensor, etc.

Industry Applications

ALPHA6900 series special AC drive is often found within the hoisting industry. It can be applied in the tower cranes, port machinery, and more.

Technical Specifications of ALPHA6900

Item Specification
Power Range 380V ±20% three phases: from 5.5 to 500kW
Rated Input Voltage and Frequency Three phases: 380~440V 50/60Hz
Allowable Input Voltage Range 220V three phases: 176~264V, Frequency fluctuation of less than ±5%
380V three phases: from 304 to 456V, Voltage unbalance rate of less than 3%, Frequency fluctuation of below ±5%
Rated Output Voltage From 0 to rated input voltage
Max. Overload Current G model: 150% for one minute, 180% for 20 seconds
Control Method V/F control, Open loop vector control, Close loop vector control
Frequency Range 0.00~400.00Hz (35R5GB/37R5GB and above)
Frequency Accuracy Digital command ± 0.01% (from -10℃ to +40℃)
Simulation command ± 0.01% (25℃ ± 10℃)
Preset Frequency Resolution Digital command 0.01Hz
Simulation command 1/1000 of the maximum frequency
Output Frequency Resolution 0.01Hz
Preset Frequency Signal From 0 to 10V, from 0 to 20mA
Acceleration-Deceleration Time From 0.1 to 3600 seconds (The acceleration and deceleration time can be preset separately.)
Braking Torque The additional braking resistance reaches up to 125%.
Voltage-Frequency Characteristics Four kinds of fixed V/F characteristics are selectable.
Any V/F characteristic can be preset.
The V/F control with PG is available.
Protective Functions Over-voltage, under-voltage, current limit, over-current, overload, electronic thermal relay, overheating, over-voltage stall, load short circuit, grounding, under-voltage protection, input phase loss, output phase loss, short circuit to ground, interphase short circuit, motor overload protection, etc
Ambient Temperature From -10℃ to +40℃
Humidity From 5 to 95% RH (No condensation)
Storage Temperature From -40℃ to +70℃
Service Place Indoor (without any corrosive gas)
Installation Site The altitude is at most 1,000m. There is not any dust, corrosive gas, or direct solar radiation.
Vibration Less than 5.9m/s2 (0.6g)
Protection Rating IP20
Cooling Method Natural cooling or forced air cooling

ALPHA6900 Selection Table

Voltage Classes Model
(Close Loop Vector Control)
Motor Power (kW) Rated Current (A)
380V Three Phases 35R5GB 5.5 13.0
37R5GB 7.5 17
3011GB 11 25
3015GB 15 32
3018G 18.5 37
3022G 22 45
3030G 30 60
3037G 37 75
3045G 45 90
3055G 55 110

Overall Dimension of ALPHA6900 Series Special AC Drive for Crane

Model H H1 W W1 D D1 D2 d
35R5GB 270 255 190 175 176 186 122 7

Model H H1 W W1 D D1 D2 d d 1
3011GB 373 360 235 200 176 188 125 7 12
3018G 420 405 270 200 218 230 175 7 14
3030G 503 488 311 200 230 242 180 7 14
3045G 590 570 351 200 254 266 192 10 20
Brochure Solutions

Related Names
Crane Drive And Control System | Integrated Frequency Inverter | Crane Hoist Drives

Feedback Form