Residual Hazards - Lenze i550 Series Project Planning Manual

Residual hazards

Even if notes given are taken into consideration and protective measures are implemented,
the occurrence of residual risks cannot be fully prevented.
The user must take the residual hazards mentioned into consideration in the risk assessment
for his/her machine/system.
If the above is disregarded, this can lead to severe injuries to persons and damage to prop-
erty!
Protection of persons
Before working on the inverter, check if no voltage is applied to the power terminals.
Depending on the device, the power terminals X105 remain live for up to 3 ... 20 minutes.
•
The power terminalsX100 and X105 remain live even when the motor is stopped.
•
Motor protection
With some settings of the inverter, the connected motor can be overheated.
E. g. by longer operation of self-ventilated motors at low speed.
•
E. g. by longer operation of the DC-injection brake.
•
Protection of the machine/system
Drives can reach dangerous overspeeds.
E. g. by setting high output frequencies in connection with motors and machines not suita-
•
ble for this purpose.
The inverters do not provide protection against such operating conditions. For this pur-
•
pose, use additional components.
Switch contactors in the motor cable only if the controller is inhibited.
Switching while the inverter is enabled is only permissible if no monitoring functions are
•
activated.
Motor
If there is a short circuit of two power transistors, a residual movement of up to 180°/number
of pole pairs can occur at the motor! (e. g. 4-pole motor: residual movement max. 180°/2 =
90°).
Parameter set transfer
During the parameter set transfer, control terminals of the inverters can adopt undefined
states.
Thus, the control terminal of the digital input signals have to be removed before the trans-
•
fer.
This ensures that the inverter is inhibited. The control terminals are in a defined state.
•
Degree of protection - protection of persons and device protection
Information applies to the mounted and ready-for-use state.
•
Information does not apply to the wire range of the terminals.
•
Terminals that are not assigned only have a low protection against contact.
-
Terminals for large cable cross-sections have lower classes of protection, e. g. from
-
15 kW IP10 only.
Commissioning
If you use the Application Loader as a download tool for safety-related parameter sets, vali-
date the parameter sets after the download.
Device exchange without tool
Exchange a maximum of one safe device before recommissioning.
Exchange of devices
Test the compatibility of the devices before exchanging.
Information on project planning
Safety instructions
Residual hazards
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