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14.5 SAFETY
Installation, start-up and servicing of equipment can be hazardous if certain factors particular to the installation are not
considered: operating pressures, presence of electrical components and voltages and the installation site (elevated
plinths and built-up up structures). Only properly qualified installation engineers and highly qualified installers and
technicians, fully trained for the product, are authorised to install and start-up the equipment safely.
During all servicing operations, all instructions and recommendations, which appear in the installation
and service
instructions for the product, as well as on tags and labels fixed to the equipment and components and accompanying
parts supplied separately, must be read, understood and followed.
Apply all standard safety codes and practices. Wear safety glasses and gloves.
Use the proper tools to move heavy objects. Move units carefully and set them down gently.
14.5.1 Avoid electrocution
Only personnel qualified in accordance with IEC (International Electrotechnical Commission) recommendations may be
permitted access to electrical components. It is particularly recommended that all sources of electricity to the unit be
shut off before any work is begun. Shut off main power supply at the main circuit breaker or isolator.
IMPORTANT
: This equipment uses and emits electromagnetic signals. Tests have shown that the equipment conforms to
all applicable codes with respect to electromagnetic compatibility.
RISK OF ELECTROCUTION: Even when the main circuit breaker or isolator is switched off, certain
circuits may still be energised, since they may be connected to a separate power source.
RISK OF BURNS: Electrical currents cause components to get hot either temporarily or permanently.
Handle power cable, electrical cables and conduits, terminal box covers and motor frames with great
care.
Always disconnect the VFD from the power source before performing any maintenance or adjustment. The VFD shall be
deemed off when at least one of the following conditions is met:
All fuses connected in series with the power supply have been removed
The main switch is disconnected at all poles
No power is supplied to the VFD
AND
The power supply to the solenoid valve circuit is disconnected
AND
The DC-Link capacitors are discharged
RISK OF ELECTRIC SHOCK: Before opening the enclosure, wait at least 20 minutes after
disconnecting the power supply, as indicated on the label applied on the Inverter enclosure.
This to make sure that all live parts are discharged.
NOTE: residual voltage (< 60 V) may still be present across the DC-Link after 20 minutes.
Never touch the inverter while removing the enclosure. Always check the DC-Link capacitors
are discharged at least below 60 V before initiating any operation on the inverter!
The device without its cover can be accessed only 20 minutes after the power supply has been switched off. This time
allows the DC-Link capacitors to be discharged to a safe voltage level.
RISK OF ARC FLASH: A substantial amount of energy can be stored in the capacitor bank even if its
voltage is below 60 V. Do not short-circuit the DC-Link unless the capacitor bank is completely
discharged. Before commencing any mechanical work on the inverter, discharge completely the DC-
Link by means of a suitable external device or allow enough time for the DC -Link to be completely
discharged (< 5 V).
Fig. 13 - Label: Risk of Electric shock
