Wiring the standard device
Important notes
Motor protection
5
5.1
5.1.4
5.1-4
EDSVF9333V EN 3.0-06/2005
5.1.4 Motor protection
ƒ Extensive protection against overload:
– By overcurrent relays or temperature monitoring.
– We recommend the use of PTC thermistors or thermostats to monitor
the motor temperature.
– PTC thermistors or thermostats can be c onnected to the controller.
ƒ Only use motors with an insulation suitable for the inverter operation:
– Insulation resistance: max. û = 1.5 kV, max. du/dt = 5 kV/μs
– When using motors with an unknown insulation resistance, please
contact your motor supplier.
5.1.5 Supply form/electrical supply conditions
Please observe the restrictions for each mains type!
Mains Operation of the drive controller Notes
With earthed
neutral
(TT/TN mains)
No restrictions z Observe controller ratings
z Mains r.m.s. current: see chapter
”Technical data”
With isolated
neutral
(IT mains)
Possible, if the controller is protected
in the event of an earth fault in the
supplying mains.
z Possible, if appropriate earth fault
detections are available and
z the controller is immediately
separated from the mains.
z Safe operation in the event of an
earth fault at the inverter output
cannot be guaranteed.
z The variants V024 and V100
enable the operation of the
9300 vector frequency inverter on
IT systems
DC supply via
+U
G
/-U
G
Permitted if the DC voltage is
symmetrical to PE
The controller will be destroyed
when +U
G
or -U
G
are grounded.
5.1.6 Interaction with compensation equipment
ƒ Controllers only consume very little reactive power of the fundamental
wave from the AC supply mains. Therefore, a compensation is not
required.
ƒ If the controllers are operated at mains with compensation, this
equipment must be used with chokes.
– For this, contact the supplier of the compensation equipment.
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