Lenze 8200 Frequency inverters - Manual (Page 83)

Installation
8200SHB0199 4-26
4.2.2 Protection of the controllers
Stop!
The controllers contain electrostatically sensitive components:
-
Prior to assembly and service operations, the personnel must be free of
electrostatic charge.
-
Discharging is possible by touching the PE fixing screw or another
grounded metal part in the control cabinet.
-
The controller is protected by external fuses.
-
Unused control inputs and outputs should be covered with plugs.
-
Frequent mains switching can overload the internal switch-on current
limitation. For cyclic mains switching, the controller can be switched on
every three minutes as a maximum.
-
The controllers 8204, 8214, 8218, 8222 - 8227, 8224, 8246 must only be
operated together with appropriate mains filter/mains choke.
-
In case of condensation, connect the controller to the mains voltage only
after the visible humidity has evaporated.
4.2.3 Motor protection
-
Total motor protection according to VDE:
- By overcurrent relays or temperature monitoring
- Required for group drives
(motors connected in parallel to a controller)
- We recommend the use of PTC thermistors or thermostats with PTC
characteristic for monitoring the motor temperature.
(As standard, Lenze three-phase AC motors are equipped with PTCs.)
- The PTC or thermostat can be directly connected to the units 822X/824X.
With the units 820X/821X, they are connected by means of the PTC
module 8274 or the I/O module 8275 (see Accessories).
-
When using motors with insulation which is not suitable for inverter
operation:
- Please contact your motor supplier.
Lenze-three-phase AC motors are designed for inverter operation.
- In general, operation with the assigned motor filters is possible.
-
With the corresponding parameter setting, the controllers reach field
frequencies up to 240 Hz/480 Hz:
- When operating inappropriate motors, dangerous overspeeds may occur
and result in the destruction of the drive.
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