2 Safety
2.1 Safety Symbols
The following symbols are used in this document.
WARNING
Indicates a potentially hazardous situation which could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which could
result in minor or moderate injury. It may also be used to
alert against unsafe practices.
NOTICE!
Indicates important information, including situations that
may result in damage to equipment or property.
2.2 Qualified Personnel
Correct and reliable transport, storage, installation, operation
and maintenance are required for the trouble-free and safe
operation of the adjustable frequency drive. Only qualified
personnel is allowed to install or operate this equipment.
Qualified personnel is defined as trained staff, who are
authorized to install, commission, and maintain equipment,
systems and circuits in accordance with pertinent laws and
regulations. Additionally, the personnel must be familiar with
the instructions and safety measures described in this
document.
2.3
Safety Precautions
WARNING
HIGH VOLTAGE!
Adjustable frequency drives contain high voltage when
connected to AC line power. Installation, start-up, and
maintenance must be performed by qualified personnel
only. Failure to perform installation, start-up, and
maintenance by qualified personnel could result in death
or serious injury.
WARNING
UNINTENDED START!
When the adjustable frequency drive is connected to AC
line power, the motor may start at any time. The
adjustable frequency drive, motor, and any driven
equipment must be in operational readiness. Failure to be
in operational readiness when the adjustable frequency
drive is connected to AC line power could result in death,
serious injury, equipment or property damage.
WARNING
DISCHARGE TIME!
Adjustable frequency drives contain DC link capacitors that
can remain charged even when the adjustable frequency
drive is not powered. To avoid electrical hazards,
disconnect AC line power, any permanent magnet type
motors, and any remote DC link power supplies, including
battery backups, UPS and DC link connections to other
adjustable frequency drives. Wait for the capacitors to
discharge completely before performing any service or
repair work. The amount of waiting time is listed in
Table 2.1. Failure to wait the specified time after power has
been removed before doing service or repair could result
in death or serious injury.
Voltage [V] Minimum waiting time [minutes]
4 7 15
200–240 1.1–3.7 kW 5.5–45 kW
380–480 1.1–7.5 kW 11–90 kW
525–600 1.1–7.5 kW 11–90 kW
525–690 1.1–7.5 kW 11–90 kW
High voltage may be present even when the warning LED
indicator lights are off.
Table 2.1 Discharge Time
WARNING
LEAKAGE CURRENT HAZARD!
Leakage currents are higher than 3.5 mA. It is the responsi-
bility of the user or certified electrical installer to ensure
correct grounding of the equipment. Failure to ground the
adjustable frequency drive properly could result in death
or serious injury.
Safety
VLT
®
HVAC Drive Instruction Manual
6 MG11AJ22 - Rev. 2013-09-13
22
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