42 Planning the electrical installation
The most common temperature sensors are:
• motor sizes IEC180…225: thermal switch (for example Klixon)
• motor sizes IEC200…250 and larger: PTC or Pt100.
For more information on the thermal model, see section Motor thermal protection on
page 135. For more information on the temperature measurement function, see
section Motor temperature measurement through the standard I/O on page 145.
Using residual current devices (RCD) with the drive
ACS310-03x drives are suitable to be used with residual current devices of Type B.
Other measures for protection in case of direct or indirect contact, such as separation
from the environment by double or reinforced insulation or isolation from the supply
system by a transformer, can also be applied.
Implementing a bypass connection
WARNING! Never connect the supply power to the drive output terminals U2,
V2 and W2. Power line voltage applied to the output can result in permanent
damage to the drive.
If frequent bypassing is required, employ mechanically connected switches or
contactors to ensure that the motor terminals are not connected to the AC power line
and drive output terminals simultaneously.
Protecting the contacts of relay outputs
Inductive loads (relays, contactors, motors) cause voltage transients when switched
off.
Equip inductive loads with noise attenuating circuits (varistors, RC filters [AC] or
diodes [DC]) in order to minimize the EMC emission at switch-off. If not suppressed,
the disturbances may connect capacitively or inductively to other conductors in the
control cable and form a risk of malfunction in other parts of the system.
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