Variair Frequency Inverters

For Soft Starts and Output Control


Photo of a Becker VAU 4/3 frequency inverter.

VAU 4/3


Photo of a Becker VAU 7.5/3 frequency inverter.

VAU 7.5/3


Photo showing Becker VAU 4/4, VAU(w) 7.5/3, and VAU 11-22/3 frequency inverters.

VAU 4/4, VAU(w) 7.5/3, VAU 11-22/3


Photo of a Becker GBB SK 750E frequency inverter.

GBB SK 750E


  Models

VAU 4/3

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Motor rated power [kW] 4.0
Mains voltage 3 AC 400-480 V, ±10%, 47 ... 63 Hz
Typical input current [A] 13.0
Recommended mains fuse 16 A (surge-proof)
Output voltage 3 AC 0 V - mains voltage
Output continuous current [A] 9.5
Output frequency [Hz] 0-400
Output voltage, External ventilator supply [V] 3 AC mains voltage
Fuse, external ventilator supply (optional) 500 mA (T), surge-proof
Maximum switch-on frequency per hour 12
Digital inputs
Signal level, high status
Signal level, low status
 
12 V – 30 V
0 V – 5 V
Analogue inputs, Transduction accuracy 10 bit
Analogue outputs
maximum ampacity as current output
maximum apparent ohmic resistance as current output
 
10 mA
1 kOhm
24 V DC fixed voltage output
maximum ampacity
 
70 mA
10 V DC fixed voltage output
maximum ampacity
 
30 mA
Potential-free contacts, max. load 230 V/2 A
Ventilation air cooled by motor ventilator
Ambient temperature during operation [°C] 0–50
Storage temperature [°C] -20 ... 70
Maximum humidity 90% without condensation
Maximum installation altitude Up to 1000 m above sea level without loss of performance
Weight [kg] 5.6
Type of protection IP 55
Maximum cross-section power supply [mm2] 2.5
Maximum cross-section pilot wires [mm2] 1.5
Maximum connection cross-section external ventilator [mm2] 2.5
Terminal range, power cable: [mm] 7.0 ... 13, width across flats 25
Terminal range, pilot wires: [mm] 4.5 ... 9.0, width across flats 20

VAU 7.5/3

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Rated motor power [kW] 7.5
Mains voltage 3 AC 400V-15%...480V+10%, 50/60 Hz
Rated / input current [A] 17.8
Short time max. current [A] 26.7 (150% IN) for 60 sec.
Output frequency [Hz] 0-400
Protection functions overvoltage, undervoltage, I2t- limitation,
short circuit, motor temperature,
FC temperature, motor current limitation
Ambient temperature at rated power [°C] -10...+50
Altitude Up to 1000 m over sea level
over1000 m with reduced power
(1% per 100 m) (max. 2000 m)
Protection class IP55
Weight incl. adapter plate [kg] 8.7
Switching frequency of the power stage [kHz] 4, 8, 16, (default setting 8)
EMC certificates
according to DIN EN 61800-3;
VDE 0160-103:2005-07
C2

VAU 4/4, VAU(w) 7.5/3, VAU 11-22/3

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Description \ size VAU 4/4 VAU(w) 7.5/3 VAU 11-22/3
Typical motor output [kW]
to be connected (4 pole
asynchronous motor)
4 7.5 11 15 18.5 22
Mains voltage [V] 3~ 400 –15% ... 480 +10%1)
Mains frequency [Hz] 47 bis 63
Grid configuration TN / TT
Mains current [A] 7.9 14.8 23.2 28.2 33.2 39.8
FC output current, eff. [A]
[IN at 8 kHz / 400 V]
9.5 17.8 28.0 34.0 40.0 48.0
Min. brake resistance [Ω] 50 50
Max. overload 150% of nominal current for 60 sec 130%
Switching frequency [kHz] 4, 8, 16, (factory setting 8)
Rotary field frequency [Hz] 0-400
Protection function Over- and undervoltage, I2t limitation,
short circuit, motor/frequency converter temperature,
tilt protection, stall protection
Weight incl. adapter plate [kg] 5.0 8.7 21.0
Degree of protection [IPxy] 65 55
EMC complied with according to DIN EN 61800-3
Interference emission: 1st environment category C2
Interference immunity: 2nd environment
Vibration and shock resistance: DIN EN 60068-2-6 severity level 2 (vibration during transport)
DIN EN 60068-2-27 (vertical impact test)
2...200 Hz for sinusoidal oscillations.
Ambient temperature [°C] -25 (without condensation) to +50 (without derating)
Cooling: Surface cooling:
VAU 4/4 and VAU 7.5/3: free convection;
VAU 7.5/3: optionally with integrated fan;
VAU 11-22/3: with integrated fan.
Water cooling:
VAUw 7.5/3: with integrated water cooler
Relative humidity: ≤ 96%, condensation not permissible
Altitude of installation location: up to 1000 m above MSL/
more than 1000 m with reduced output
(1% per 100 m) (max. 2000 m)

1) Approx. 50% reduced supply feed possible (reduced output power)


GBB SK 750E

General Technical Data

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Output frequency 0.0 ... 800.0 Hz
Pulse frequency 3.0 ... 8.0 kHz (standard = 6 kHz)
Typical overload capability 150% for 60 s, 200% for 5 s
Protective measures against: Converter overtemperature, over- and undervoltage,
short circuit, earth fault, overload, no-load
Types of control Sensorless current vector control (ISD),
flux current control,
linear v/f characteristic
Analog setpoint input/PID input 0/2 ... 10 V, 0/4 ... 20 mA
Analog setpoint resolution 10-bit in relation to measuring range
Analog output (optional) 0 ... 10 V scalable, 4 ... 20 mA
Setpoint stability Analog < 1%, digital < 0.02% (optional)
Motor temperature monitoring I2t-Motor (UL/cUL-approved),
PTC / bimetallic relay (optional, not UL/cUL-approved)
Ramp times 0 ... 320 s
Control outputs 1 or 2 relays 28 V DC / 230 V AC, 2 A
Interface See appropriate section
Frequency converter efficiency Approx. 95%
Ambient temperature 0 °C ... +50 °C (S1- 100% duty ratio),
0 °C ... +60 °C (S1 – 75% duty ratio)
Storage and shipping temperature -40 °C ... +70 °C
Long-term storage When a frequency converter is in storage, it should at the latest after
one year be connected to mains voltage for 60 minutes. Ensure that this
cycle maintained over the entire storage period.
Type of protection IP54 air-cooled design (IP65 water-cooled design)
Electrical isolation Control terminals (digital and analog inputs)
Max. altitude a.s.l. Up to 1000 m: output is not affected
> 1000 m: output reduced by 5% / 1000 m, up to max. 3000 m
Max. permitted mains switch-on frequency 125 times / hour
Waiting time between two
cycles of connecting to mains
60 s for all equipment under normal operation conditions

Electrical Data

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Device type: VAU 11/1-400
VAUw 11/1-400
VAU 15/1-400
VAUw 15/1-400
VAU 18/1-400
VAUw 18/1-400
VAU 22/1-400
VAUw 22/1-400
Motor rating 400 V
(4-pole standard motor) 460 ... 480 V)
11.0 kW
15 hp
15.0 kW
20 hp
18.5 kW
25 hp
22.0 kW
30 hp
Mains voltage 3 AC 400–480 V, ±10%, 47 ... 63 Hz
Output voltage 3 AC 0 – mains voltage
Nominal output current (rms) [A] 23 30 35 45
Recomm. brake resistor (accessory) 33 Ω 25 Ω 20 Ω 15 Ω
Typical input current (rms) [A] 30 40 50 60
Recomm. mains fuse surge-proof 35 A 50 A 50 A 63 A
Ventilation Water or fan cooling (operating controlled)
Weight [kg] approx. 18 approx. 22.5

Electrical Data for UL/cUL Approval

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Device type: VAU 11/1-400
VAUw 11/1-400
VAU 15/1-400
VAUw 15/1-400
VAU 18/1-400
VAUw 18/1-400
VAU 22/1-400
VAUw 22/1-400
Motor rating 360 ... 480 V
(4-pole standard motor)
15 hp 20 hp 25 hp 30 hp
FLA [A] 360 ... 380 V 27 34 44 51
440 ... 480 V 21 27 34 40
Recomm. mains fuse J class fuse LPJ 40 A LPJ 50 A LPJ 60 A LPJ 70 A

  Features

Benefits

  • Soft starts
  • Energy efficiency
  • Reduced wear/maintenance on your pump
  • Reduced noise

The frequency inverter integrated in the VARIAIR UNIT significantly enhances the performance data of Becker pumps. It matches pump delivery exactly to customer requirements. Energy consumption is optimized and constant vacuum/pressure is guaranteed even where demand is subject to variation or severe fluctuation. As no unnecessary suction/blast air is generated, noise is kept to a minimum. Dirt from the surrounding environment is kept out of the pump. "Gentle" start-up reduces strain on mechanical components and reliably extends their useful life. Variable output ranges minimize the number of different types required, thus also providing logistical advantages.

  Dimensions

VAU 4/3

Picture showing the dimensions of a Becker VAU 4/3 frequency inverter.

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Device Type Dimensions [mm] Weight (approx.)
[kg]
L W H
Air-cooled model 240 185 150 5.6

VAU 7.5/3

Picture showing the dimensions of a Becker VAU 7.5/3 frequency inverter.

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Device Type Dimensions [mm] Weight (approx.)
[kg]
L W H
VAU 7.5/3 307 233 181 8.7*

* Adapter plate included.


VAU 4/4, VAU(w) 7.5/3, VAU 11-22/3

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Device Type Dimensions [mm] Weight (approx.)
[kg]
L W H
VAU 4/4 270 189 140 5.0*
VAU 7.5/3 307 223 181 8.7*
VAUw 7.5/3 307 223 155 8.7*
VAU 11-22/3 414 294 232 21.0*

* Adapter plate included.


GBB SK 750E

Air-cooled Models

Picture showing the dimensions of a Becker GBB SK 750E series air-cooled frequency inverter.

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Inverter Type Dimensions [mm] Weight (approx.)
[kg]
L W T
VAU 5.5/1-200
VAU 7.5/1-200
414 255 237.5 18
VAU 11/1-400
VAU 15/1-400
19
VAU 11/1-200 472 305 253 18
VAU 18/1-400
VAU 22/1-400
23.5

Water-cooled Models

Picture showing the dimensions of a Becker GBB SK 750E series water-cooled frequency inverter.

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Inverter Type Dimensions [mm] Weight (approx.)
[kg]
L W T
VAUw 5.5/1-200
VAUw 7.5/1-200
414 255 175 15
VAUw 11/1-400
VAUw 15/1-400
16
VAUw 15/2-400 450 250 300 27.6
VAUw 11/1-200 472 305 177 19
VAUw 18/1-400
VAUw 22/1-400
20

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