Electrical installation
Important notes
Device protection
l
87
EDS84ASC552 EN 6.0
6.1.2
Device protection
ƒ
In case of condensation, do not connect the controller to the mains voltage before
the moisture has evaporated completely.
ƒ
The controller must be protected by external fuses.
ƒ
Provide unused control inputs and outputs with terminal strips.
6.1.3
Maximum motor cable length
ƒ
The motor cable must be as short as possible for having a positive effect on the drive
behaviour.
ƒ
For group drives (several motors connected to one drive controller) the resulting
cable length l
res
is the crucial factor:
I
res
[m]
+
(l
1
)
l
2
)
l
3
...
)
l
i
)
@
i
Ǹ
l
x
Length of the individual motor cable
l
res
Resulting length of the motor cable
i
Number of the individual motor cables
ƒ
At rated mains voltage and a switching frequency of 8 kHz and without additional
output filters, the maximum permissible length of the motor cable is as follows:
– 50 m shielded
– 100 m unshielded
)
Note!
For compliance with EMC regulations, the permissible cable lengths must be
changed.
6.1.4
Motor protection
ƒ
Extensive protection against overload:
– Through overcurrent relay or temperature monitoring.
– We recommend to use PTC thermistors or thermostats to monitor the motor
temperature.
– PTC thermistors or thermostats can be connected to the controller.
ƒ
Only use motors which have a suitable insulation for the inverter operation:
– Insulation resistance: min. û = 1.5 kV, min. du/dt = 5 kV/
s
– When using motors with an unknown insulation resistance, please contact your
motor supplier.
6.1.5
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 connected to a supply system with compensation equipment,
this equipment must be used with chokes.
– For this, contact the supplier of the compensation equipment.
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