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ALPHA6700S series is a new generation special AC drive for machine tool industry. Considering that rough machining has large cutting depth calling for high & stable start torque for main spindle and that finishing machining requires even torque, stable speed, and quick start/stop, ALPHA 6700S, with its rich application experience in machine tool industry and advantages of ALPHA6000S hardware, commendably satisfies these professional requirements of high start torque and strong capability of heavy load at high frequency.

Technical Characteristics

More precise motor model; large start torque; higher load capacity at high frequency

Control of high-frequency field weakening (for milling machine); stable current when frequency higher than 60Hz

Quick start, stop and brake

Steady-state speed precision keeps 5% with 0~180% load, meeting demands of machine tools
Lower speed fluctuation under heavy load; rapider torque response

Special design for machine tool industry; fixed key running parameters; reduced codes testing
Impressively reduce the spindle stalling

Precise model and algorithm; quick voltage rise; stable current; stable torque

100% slip compensation; once the load increases, the frequency is compensated to avoid severe speed fluctuation

Slip compensation filter time is 1.00s; vibration-free under heavy load at low frequency; 0.2s rapid frequency compensation under heavy load at high frequency

Optimized motor parameters of all power range; vectorized motor parameters with only 5% error; more precise model

Applications

The special AC drive gives a wide range of applications, including the numerical control machine tools, NC lathes, face miller, engraving machines, cold heading machines, mechanical presses, hydraulic machines, electric screw presses, rolling mills, planer-type milling machines, grinding machines, punch presses, boring machines, drilling machines, plate shearing machines, NC cutting tools, and more.

Technical Specifications of ALPHA6700S

Item
Specification
Power Range
380V ±20% three phases: from 1.5 to 18.5kW
Rated Input Voltage and Frequency
Three phases: 50/60Hz
Allowable Input Voltage Range
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
Frequency Range
From 0.00 to 650.00Hz (from 31R5GB to 3004GB)
From 0.00 to 400.00Hz (from 35R5GB to 3018G)
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 are set individually.)
Braking Torque
The additional braking resistance can reach up to 125%.
Voltage-Frequency Characteristics
Four kinds of fixed V/F characteristics are optional.
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, and more
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. No dust, corrosive gas, or direct solar radiation can be found.
Vibration
Less than 5.9m/s2 (0.6g)
Protection Rating
IP20
Cooling Method
Natural cooling or forced air cooling

ALPHA 6700S Selection Table

Voltage Classes
Model
Motor Power (kW)
Rated Output Current (A)
380V Three Phases
6700S-31R5GB
1.5
4
6700S-32R2GB
2.2
6
6700S-3004GB
4
9
6700S-35R5GB
5.5
13
6700S-37R5GB
7.5
17
6700S-3011GB
11
25
6700S-3015GB
15
32
6700S-3018G
18.5
37

Overall Dimension of ALPHA6700S Series Special AC Drive for Machine Tool

Model
H
H1
W
W1
D
D1
D2
D3
d
6700S-31R5GB
180
169
115
105
150
158
85
120
4.5
6700S-32R2GB
6700S-3004GB
195
173
130
108
157
167
100
130
4.5

Model
H
H1
W
W1
D
D1
D2
d
6700S-35R5GB
270
255
190
175
176
186
122
7
6700S-37R5GB

Model
H
H1
W
W1
D
D1
D2
d
d 1
6700S-3011GB/3015PB
373
360
235
200
176
188
125
7
12
6700S-3015GB/3018PB
6700S-3018G/3022P
420
405
270
200
218
230
175
7
14
Instruction Manual

Related Names
CNC Machine Tool Drive | Frequency Changer | Industrial Drives

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