General electric VAT2000

7. Options

(2)External DBR

If the braking torque or ED are insufficient with the above built-in resistor, provide an external resistor wired as shown in Fig. 7-3. When using an external DBR, remove the built-in DBR. The resistance value to obtain a 100% braking torque is shown in Table 7-4.

When using the external DBR resistor, is recommended the use of a thermal relay (76D), to prevent burning as shown in Fig. 7-3

.

Fig. 7-3 DBR circuit

7-4-2 Units U2KN11K0S and larger, and U2KX11K0S and larger.

When carrying out dynamic braking with the unit U2KN11K0S and larger, or U2KX11K0S and larger, an external dynamic braking unit must be used. Choose the unit according table 7-2

Connect the DBR unit as shown in Fig. 7-4. In some cases more than one unit can be wired in parallel, check table 7-2.

Fig. 7-4 DBR connection

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7. Options

The resistance value to obtain a 100% braking torque is shown in Table 7-4.

Table 7-4

Note 1 Recommended resistor is rated for a ED of 10%, with maximum braking time of 20 sec. For braking large inertia loads, ask your supplier for an appropriate resistor.

Type 1(*) Provided with 210mm output wiring (No terminals)

7-8

7. Options

7-5 Electro Magnetic Compliance, EMC

Electromagnetic Compliance with the EN50081 & EN50082 is achieved by using appropriate EMC filters. EMC foot print filters can be mounted on the drive’s foot saving space in cabinets, or alternatively along side the drive when the total depth is a problem.

Details of Foot print and Stand alone filters are given below.

(1) Foot-print filters

(2) Stand Alone EMC filters

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7. Options

(3)Recommended Installation instructions for Electro Magnetic Compliance

An inverter has not intrinsic on its own, but is considered as a component to be installed with other control components. It should be possible to achieve EMC for the machinery

controlled by the inverter by following the guidelines below.

1.Check the filter and inverter rating labels to ensure that the part numbers are correct.

2.Ensure the best possible earthing of the filter.

3.Both filter and inverter have to be securely mounted.

4.Connect the incoming mains supply to the filter terminals marked ”lines”, connect any earth cables to the earth stud provided. Connect the filter terminals marked ”LOAD” to the mains supply of the inverter using short lenghts of appropriate gauge cable.

5.Connect the motor by means of armoured or screened cable. The earth conductor should be securely earthed at both inverter and motor ends and

the screen should be connected to the enclosure body.

It is important that the lead length from filter to inverter and unscreened length of motor output cable be kept as short as possible and that incoming mains and outgoing cables are kept well separated.

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8. Maintenance and Inspection

Chapter 8 Maintenance and Inspection

DANGER

•Always wait at least 20 minutes after turning the input power OFF before starting inspections.

Wait at least 20 minutes after turning the input power OFF before starting work. Make sure that the displays on the operation panel have gone out before removing the front cover.

Remove the front cover, and confirm that the "CHARGE" LED on the drive PCB or at the side of the control PCB has gone out. Also check that the voltage between terminals L+1 or L+2 and L– is 15V or less before starting the inspections.

Failure to observe this could lead to electric shocks.

•Maintenance, inspections and part replacement must be done by a designated person. (Remove all metal accessories such as watches, bracelets, etc., before starting the work.) (Always use an insulation measure tool.)

Failure to observe this could lead to electric shocks and injuries.

•Always turn the power OFF before inspecting the motor or machine. A potential is applied on the motor terminal even when the motor is stopped.

Failure to do so could lead to electric shocks and injuries.

•Do not use parts other than those designated for the replacement parts. Contact your inverter dealer for replacement parts.

Failure to observe this could lead to fires.

CAUTION

•Clean the inverter with a vacuum cleaner. Do not use water or organic solvents. Failure to observe this could lead to fires or damage.

8-1 Inspection items

The inspections must be carried out periodically according to the working environment and frequency of use. If there are any abnormalities, the cause must be inspected immediately and countermeasures taken.

(1) Daily inspections

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8. Maintenance and Inspection

(2) Periodic inspections

(3)Inspection of spare VAT2000

The inspection shown in Table 8-2 must also be performed for spare VAT2000 that are left connected but are not used in normal operation. The operation of the VAT2000 must be checked every six months by turning the power on.

8-2 Measuring devices

As the voltage and current on the input and output sides include high harmonics, the measured value will differ according to the measuring device. When measuring with a device for commercial frequencies, measure with the following circuits and noted measuring devices.

Fig. 8-1 Measurement circuit example

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8. Maintenance and Inspection

8-3 Protective functions

The VAT2000 has the protective functions shown in Table 8-3.

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8. Maintenance and Inspection

8-4 Troubleshooting with fault display

The countermeasures for when the inverter stops with a fault code display are shown in Table 8-4.

Table 8-4 Troubleshooting (1)

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8. Maintenance and Inspection

8-5

8. Maintenance and Inspection

8-6