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VFD General Safety Instructions

The manufacturer's specifications and instructions contained in the documentation must be complied with strictly during the variable frequency drive installation and commissioning. Before starting the relevant activity, read the VFD instructions of the manufacturers carefully and comply with the safety instructions.

Purpose of the VFDs
The VFDs are electrical drive components intended for installation in industrial plants or machines. Commissioning and start of operation is not allowed until it has been verified that the machine meets the requirements of the EC Machinery Directive 2006/42/EEC and EN 60204. In accordance with the CE marking requirements, the VFD complies with the Low Voltage Directive 2006/95/EC as well as EN 61800-5-1. The drives user shall be responsible for making sure that the requirements of the EMC Directive 2004/108/EEC are met. VFDs are only available at specialized dealers and are exclusively intended for professional use as per EN 61000-3-2.

Purposes other than intended may result in the exclusion of warranty. The VFDs are also marked with the UL label according to UL508c, which proves that they also meet the requirements of the CSA Standard C22.2-No. 14-95. The technical data, connection specifications and information on ambient conditions are indicated on the name plate and in the instructions and must be complied with in any case. Anyone involved in any kind of work at the variable frequency drive must have read the instructions carefully and understood them before starting the work.

General Information
The DC-link circuit of the VFD is charged during operation, i.e. there is always the risk of contact with high voltage. VFDs are used for driving moving parts and they may become hot at the surface during operation.

Any unauthorized removal of the variable frequency drive's necessary covers, improper use, wrong installation or operation may result in serious injuries or material damage.

In order to avoid such injuries or damage, only qualified technical staff may carry out the transport, installation, commissioning, setup or maintenance work required. The standards EN 50178, IEC 60364 (Cenelec HD 384 or DIN VDE 0100), IEC 60664-1 (Cenelec HD 625 or VDE 0110-1) as well as the applicable national regulations must be complied with. The term "Qualified Staff" refers to anybody who is familiar with the installation, assembly, commissioning and operation of the VFD as well as the possible hazards and has the proper qualification for the job.

Persons who are not familiar with the operation of the VFD and children must not have access to the variable frequency drive.

Transport and Storage
The VFDs must be transported and stored in an appropriate way. During transport and storage the variable frequency drives must remain in their original packaging.

The VFDs may only be stored in dry rooms which are protected against dust and moisture. The variable frequency drives may be exposed to little temperature deviations only. Observe the conditions according to EN 60721-3-1 for storage, EN 60721-3-2 for transport and the marking on the packaging. The duration of storage without connection to the permissible nominal voltage may not exceed one year.

Handling and Installation
Damaged or destroyed components must not be put into operation because they may be a health hazard. The VFDs are to be used in accordance with the instruction as well as the applicable directives and standards. They must be handled carefully and protected against mechanical stress.

Do not bend any components or change the isolating distances of the drives. Do not touch electronic components or contacts. The variable frequency drives are equipped with components which are sensitive to electrostatic energy and can be damaged if handled improperly. Any use of damaged or destroyed components shall be considered as a non-compliance with the applicable standards. Removal of seal marks may cause restrictions on warranty. Do not remove any warning signs from the variable frequency drive.

Electrical Installation
warningBefore any assembly or connection work, discharge the VFD. Verify that the VFD is discharged completely.
Do not touch the terminals because the capacitors may still be charged.
Comply with the information given in the operating instructions and on the VFD label.
Comply with the rules for working on electrical installations.

Rules for working on electrical installation:
  • Separate completely (isolate the installation from all possible sources of electrical power.
  • Fix (protect against reconnection). Reconnection must be carried out by suitably qualified persons.
  • Verify there is no electrical power. Verify that there is no voltage against earth on the plant component by measuring with measurement device or voltage tester.
  • Ground and connect in a short circuit. Connect earth conductors.
  • Protect against nearby power sources and delimit the working zone.

When working at the VFDs, comply with the relevant accident prevention regulations, the applicable standards, standards governing work on systems with dangerous voltages (e.g. EN 50178), directives for electrical and mechanical equipment erection and other national directives.

Comply with the electrical installation instructions given in the user manual as well as the relevant directives. Responsibility for compliance with and examination of the limit values of the EMC product norm EN 61800-3 for variable speed electrical drive mechanisms is with the manufacturer of the industrial plant or machine. The documentation contains information on EMC-conforming installation.

The cables connected to the VFDs may not be subjected to high-voltage insulation tests unless appropriate circuitry measures are taken before. (how to select cable for VFD?)

Information on Use
The VFD may be connected to power supply every 60s. This must be considered when operating a mains contactor in jog operation mode. For commissioning or after an emergency stop, a non-recurrent, direct restart is permissible.

After a failure and restoration of the power supply, the motor may start unexpectedly if the auto start function is activated. If staff is endangered, a restart of the motor must be prevented by means of external circuitry.

Before commissioning and the start of the operation, make sure to fix all covers and check the terminals. Check the additional monitoring and protective devices according to EN 60204 and applicable the safety directives (e.g. Working Machines Act, Accident Prevention Directives etc.). No connection work may be performed, while the system is in operation.

Maintenance and Service
Unauthorized opening and improper interventions of the variable frequency drives can lead to personal injury or material damage. Repairs on the VFDs may only be carried out by the VFD manufacturer or persons authorized by the manufacturer.
Check protective equipment regularly.
Any repair work must be carried out by qualified electricians.

The dispose of VFD components must be carried out in accordance with the local and country-specific regulations and standards.

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