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发布时间: 2018 - 04 - 11
Technical features:1. Wide voltage range inputPower voltage: -15% - 10%, 47 Hz - 63 Hz; provided with under-voltage underclocking output function that extends the applicable range of power voltage to -30% (e.g. extending the applicable range of a 380 V VFD to 266 V - 440 V); 2. High disturbance resistance Pulse group tests: ± 4,800 VStatic (air discharge): 8,000 VStatic (contact discharge): 6,000 VProvided with EMI circuit + lightning protection design3. Phase-phase and phase-to-earth short circuit protectionAny phase-phase short circuit protection 4. Anti-corrosion treatment8 µm nickel plating, and three layers of British conformal coating for key parts;5. Power source of control signals:  External power supply of +10 V and +24 V, both provided with shor...
发布时间: 2015 - 09 - 16
Technical features> Provided with an open-loop vector control permanent magnet synchronous motor, easy to wire and highly accurate in revs control, reducing on-site faults; > High dynamic responses, rapidly responding to the given value of speed while guaranteeing the stability of output revs, which allows the system to catch up with the load changes timely, thus increasing the operation efficiency of the system;> Premium overcurrent and overvoltage resistance;> The oscilloscope function of the background monitoring software monitors the real-time operation status of the VFDs for on-site commissioning;> Parameter copying function of the keyboard;> The PWM overmodulation improves the utilization of busbar voltage and increases the output voltage of VFDs, hence is applicable to cases in...
发布时间: 2015 - 05 - 20
Technical features          1. So compact with a width, height and depth of 8.6 cm, 14.5 cm and 12 cm respectively only;       2. The panel supports external access that allow copying of parameters;       3. The standard RS485 interface constitutes an independent VFD network, making it possible to set the VFD as a master or slave for master-slave control;       4. Impulse/analog input and output channels;       5. 16 segments of speed control;       6. Multiple setting channels for running frequency/commands;       7. Provided with output terminals for disconnecting relays,...
发布时间: 2015 - 07 - 14
Technical features Unique suitability to applications that require waterproofing and dust-proofing or that are of serious pollution;> Unique metal enclosure for perfect heat dissipation;> Employing advanced surface powder coating process to provide select color and an elegant appearance;> Phosphorized metal plates provide good anti-rust and -corrosion performance;> Provided with IP54 fans for steady and reliable performance;> Input voltage: 3 AC 380 V ± 15%;> Input frequency: 47 - 63 Hz; power factor: ≥95%;> Control methods: Non-PG vector control and V/F control, where for V/F control, three profiles, i.e. straight line, polyline and multiple power, are available; > Running commands source: given through panels, terminals and RS485 communication;> Frequency giving source: given t...
发布时间: 2015 - 05 - 20
Technical features> Fast response and high starting torque: for better vibration control on starting;> Low torque ripple for more stable running;> Compact structure design and optional built-in braking units (for 30 kW and lower, braking units of standard configuration);> High overload resistance (3 s for 200% of rated loads). Perfect overvoltage suppression when applied in a punching machine;> Smart commissioning: smart setting of V/F profile that doesn’t need professionals for complex commissioning, saving manpower and time;> Compatible with synchronous motors: significantly conserves energy if combined with synchronous motors. Consumes the least power in case of equivalent unit torque;> Convenient human–machine interaction, real-time monitoring of key parameters, and LED + LCD dual-disp...
发布时间: 2015 - 05 - 20
Technical features       1.2.1 Employs high-performance current vector control, making it possible for induction motors to start with high torque.       V/F control:      1 Hz 150% torque (speed regulation range 60:1)      Open-loop vector control:  0.5 Hz 150% torque (speed regulation range 100:1)       Closed-loop vector control:  0 Hz 180% torque (speed regulation range 1,000:1)1.2.2 Various parameter adjustment modes  Static self-adjustment: best suitable to the commissioning where motors are connected with handling machines;  Rotating self-adjustment: best suitable applications where...
发布时间: 2015 - 04 - 16
Technical parametersInstructions of keyboard indicator lamps Indicator lampsNameMeaningUnit indicationHzFrequency indicator lampThe unit of currently displayed parameter is Hz (Hertz).ACurrent indicator lampThe unit of currently displayed parameter is A (Ampere).VVoltage indicator lampThe unit of currently displayed parameter is V (volt).Hz + ARevs indicator lampThe unit of currently displayed parameter is R/MIN (revolution/min).A + VPercentage indicator lampsThe unit of currently displayed parameter is % (percent).Hz + VMPa indicator lampsThe unit of currently displayed parameter is MPa (mega Pascal).Status indication(MON)Indicator lamps of command sourceOff: controlled through the keyboard.  On: controlled through the terminals.  Flashing: controlled through...
发布时间: 2015 - 05 - 20
Technical features  1. Usable under large grid fluctuation;  2. Provided with protection functions such as short circuit, low voltage, overvoltage, quick-acting fuses, overheating, etc.;  3. The braking IGBTs are ensured to work within the saturation zone.  Technical parametersModel:   CDBU300-XXXA-4 seriesFor VFDsAC power supply380 VPower0.75 kW - aboveOutput featuresMax. braking currentRefer to particular models.Activated voltage of braking690 V ± 10 VHysteretic voltage670 V ± 10 VPower supplyU (p+_p-)350 V - 800 VProtectionElectronic thermal relaysIn case of the temperature of cooling fins of the braking unit exceeds 85 °C, the protection is activated, the braking unit stops braking, and the malfunction indicator lamp ligh...
发布时间: 2015 - 04 - 09
Technical features     1.  Proprietary kernel encryption          • Proprietary new PLC encryption, eradicating any possibility of cracking.          • Multiple password protection, protecting users’ programs from malicious cracking.     2.  High-speed input          • 6 channels of high-speed counter, 2 channels 200 k + 4 channels 10 k.          • 2 channels of AB phase signal input, multiple settings.          • Built-in 32-digit high-speed comparators.          • Starts when co...
Case Solutions

Parameter settings for CDE500&CDE350 one-driving-four constant-pressure water supply

日期: 2015-04-03
浏览次数: 591

 I. Parameter setting table for constant-pressure water supply tests

Function code

Name

Set value

Function code

Name

Set value

b2.01

Numerically set frequency

5 (PID)

E5.05

Engineering unit

1 (pressure)

C0.01

Function of Terminal X1

48 (1# interlock input)

E5.06

Min. setting of engineering unit

0 MPa

C0.02

Function of Terminal X2

49 (2# interlock input)

E5.07

Max. setting of engineering unit

0.60 MPa (set according to the measurement range of the actual pressure )

C0.03

Function of Terminal X3

50 (3# interlock input)

E5.08

Decimals digits for engineering unit

2 (2-digit decimal)

C0.04

Function of Terminal X4

51 (4# interlock input)

E5.26

PID deviation limit

0.01%

C1.04

Function of Terminal T1

41 (1# control)

E5.29

PID shutdown computation

1 (shutdown computation)

C1.05

Function of Terminal T2

42 (2# control)

E6.00

Multi-pump control modes

4 (variable-frequency pump circulating; automatic switching available)

C1.06

Function of Terminal T3

43 (3# control)

E6.01

Amount of motors for multi-pump control

4 pcs

C1.07

Function of Terminal T4

44 (4# control)

E6.05

Motor interlocking enabling

11 (interlocking enabling, determined by E6.06)

C2.08

Min. input of AI2

2V

E6.06

Numerical setting of motor interlocking

1111 (four pumps connected with the system)

C2.09

Settings corresponding to the min. input of AI2

0%

E6.07

Time of automatic switching

24 h (adjustable as required)

C2.10

Max. input of AI2

10V

E6.08

Frequency limit of automatic switching

40 Hz (adjustable as required)

C2.11

Settings corresponding to the max. input of AI2

100%

E6.10

Starting frequency 1

48 Hz (adjustable as required)

E5.01

Numerical given by PID

0.23 (adjusted as required by the water pressure)

E6.12

Starting frequency 2

48 Hz (adjustable as required)

E5.03

PID feedback source

1 (AI2)

E6.14

Starting frequency 3

48 Hz (adjustable as required)

II. Logic of adding and reducing pumps

1) Set E5.01 (PID giving) = 0.30 (greater than the sum of running pressure of four pumps) and E6.01 (quantity of motors) = 4, then run the VFD and observe the pump adding conditions of the system as follows:

 Parameter settings for CDE500&CDE350 one-driving-four constant-pressure water supply


2) Set PID giving > PID feedback. When all water pumps are connected into the system, reset the parameters so that PID giving < PID feedback. Observe the pump reduction conditions of the system as follows:

 Parameter settings for CDE500&CDE350 one-driving-four constant-pressure water supply

III. Automatic switching

In case that E6.00 (multi-pump control mode) = 4 (variable-frequency pump circulating; automatic switching available), set E6.07 (interval of automatic switching) = 0.3 (18 s) and E6.08 (frequency limit of automatic switching) = 40 Hz. Through regulation, make sure that only the variable-frequency pump 1 and power-frequency pump 2 are connected into the system and the output frequency of the VFD is lower than E6.08. The conditions are observed as follows:

Switching sequence and conditions

Running status of pumps after automatic switching

Switching sequence

Running status of pumps

1#

2#

3#

4#

Before switching

Running at lower than 40 Hz.

Running at power frequency.

Running at variable frequency.

Shutdown

Shutdown

First switching

Running at lower than 40 Hz for over 18 s, hence the logic is triggered to start the automatic switching.

Shutdown

Pump 2# is

switched from variable-frequency running to power-frequency running.

Pump 3# is started in variable-frequency soft start mode.

Shutdown

Second switching

Running at lower than 40 Hz for over 18 s, hence the logic is triggered to start the automatic switching.

Shutdown

Shutdown

Pump 3# is

switched from variable-frequency running to power-frequency running.

Pump 4# is started in variable-frequency soft start mode.

Third switching

Running at lower than 40 Hz for over 18 s, hence the logic is triggered to start the automatic switching.

Pump 1# is started in variable-frequency soft start mode.

Shutdown

Shutdown

Pump 4# is

switched from variable-frequency running to power-frequency running.

IV. Cautions during operation of constant-pressure water supply

S/N

Problem description

Analysis

Solutions

1

During the test of control mode 4, the variable-frequency pump 2 and power-frequency pump 1 are made the only pumps connected with the system through PID regulation, which fulfills the conditions of automatic switching. However, after the automatic switching, it is found that the running frequency of the variable-frequency pump 3, which is newly connected into the system, is 0 Hz.

After the variable-frequency pump 2 shuts down naturally, the PID stops running as well. When the variable-frequency pump 3 is connected, PID will re-perform computation. In this case, the given is equal to the feedback, which gives rise to running frequency of 0 Hz of the VFD.

Set E5.29 (PID shutdown computation) = 1 and the problem is solved.

2

During the test of control mode 3, the given pressure is set to 0.22 MPa, and the system will input a variable-frequency pump and a power-frequency pump. However, the latter will be trapped in the endless loop of pump adding and reducing.

After the variable-frequency pump reaches 50 Hz, the feedback pressure of the system will become 0.18 MPa (i.e. the upper limit of pressure that can be provided by a single variable-frequency pump). In this case, a pump adding act will be performed, after which the system pressure turns to 0.25 MPa (i.e. the upper limit of pressure that can be provided by a single power-frequency pump). And then, when the VFD frequency is reduced by 0 Hz, the feedback pressure still remains at 0.25 MPa, where the act of reducing pumps is performed once more, leading to the endless loop.

To complement the pressure difference of water supply by the pumps due to the deviation between the grid voltage and the VFD output voltage, adjust the maximum frequency and the upper limit of frequency of the VFD to 60 Hz so that the water supply pressure of the variable-frequency pump is the same as the power-frequency pump, and the problem is solved.

3

During the test of control mode 3, the given pressure is set to 0.25 MPa. When the feedback pressure is 0.25 MPa as well, the frequency will keep increasing. Only after setting the E5.26 (PID deviation limit) = 0.01 will the VFD stay at fixed frequency.

In case that no deviation limit is set, the given value for PID computation is not equal to the feedback value.

Set E5.26 (PID deviation limit) and the problem is solved.


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I. Parameter setting table for constant-pressure water supply testsFunction codeNameSet valueFunction codeNameSet valueb2.01Numerically set frequency5 (PID)E5.05Engineering unit1 (pressure)C0.01Functi...
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