Safety Instructions
2 ACS 600 MultiDrive
In most cases, the diagnostic displays can be used for preliminary
tracing of the fault location and fault resetting can be done without
opening the door of the ACS 600 MultiDrive frequency converters.
Installation and
Maintenance Safety
These safety instructions are intended for all work on the ACS 600
MultiDrive. Neglecting these instructions can cause physical injury or
death.
WARNING! All electrical installation and maintenance work on the
ACx 600 should be carried out by qualified electricians.
Any installation work must be done with power off, and power is not to
be reconnected unless the installation work is complete. Dangerous
residual voltages remain in capacitors when the disconnecting device
is opened. Wait 5 minutes after switching off the supply before starting
work. Always ensure by measuring that the voltage between terminals
UDC+ and UDC- and frame is close to 0 V and that the supply has
been switched off before performing any work on the equipment or
making main circuit connections.
If the main circuit of the inverter unit is live, the motor terminals are also
live even if the motor is not running!
Open
switch fuses of all parallel connected inverters before installation
or maintenance work in any of them.
Check the cable connections at the shipping split joints before
switching on the supply voltage.
If the auxiliary voltage circuit of the ACx 600 is powered from an
external power supply, opening the disconnecting device does not
remove all voltages. Control voltages of 115/230 VAC may be present
on the digital inputs or outputs even though the inverter unit is not
powered. Before starting work, check which circuits remain live after
opening of the disconnecting device by referring to the circuit diagrams
for your particular delivery. Ensure by measuring that the part of the
cabinet you are working on is not live.
In ACx 600 frequency converters, control boards of the converter unit
may be at the main circuit potential. Dangerous voltages may be
present between the control boards and the frame of the converter unit,
when the main circuit voltage is on. It is critical that the measuring
instruments, such as an oscilloscope, are used with caution and safety
as a high priority. The fault tracing instructions give special mention of
cases in which measurements may be performed on the control
boards, also indicating the measuring method to be used.
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