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IT NEUTRAL POINT CONNECTION : In the event of use on a 3-phase network with a voltage greater than
460V ±10 % with an isolated or high-impedance system (IT), the internal EMC filter capacitors which are
connected to ground must be disconnected. Consult BLEMO Frequenzumrichter product support who are
the only people qualified to perform this operation.
When the speed controller is powered up, the power elements and some of the control components are
connected to the line supply. It is extremely dangerous to touch them. The cover of the speed controller
must remain closed.
In general, the speed controller power supply must be disconnected before any operation on either the
electrical or mechanical parts of the installation or machine.
After the BLEMO-ER21 has been switched off and the red LED has gone out, wait for 10 minutes before
working on the equipment. This is the time required for the capacitors to discharge.
The motor can be stopped during operation by inhibiting start commands or the speed reference while the
speed controller remains powered up. If personnel safety requires prevention of sudden restarts, this
electronic locking system is not sufficient : fit a device to remove the power circuit.
The speed controller is fitted with safety devices which, in the event of a fault, can shut down the speed
controller and consequently the motor. The motor itself may be stopped by a mechanical blockage. Finally,
voltage variations, especially line supply failures, can also cause shutdowns.
If the cause of the shutdown disappears, there is a risk of restarting which may endanger certain machines
or installations, especially those which must conform to safety regulations.
In this case the user must take precautions against the possibility of restarts, in particular by using a low
speed detector to cut off power to the speed controller if the motor performs an unprogrammed shutdown.
The products and equipment described in this document may be changed or modified at any time, either
from a technical point of view or in the way they are operated. Their description can in no way be considered
contractual.
This speed controller must be installed and set up in accordance with IEC international standards and with
national standards. Bringing the device into conformity is the responsibility of the systems integrator who
must observe the European Union directives, especially the EMC directive.
The specifications contained in this document must be applied in order to comply with the essential
requirements of the EMC directive.
The BLEMO-ER21 must be considered as a component : it is neither a machine nor a device ready for use
in accordance with European directives (machinery directive and electromagnetic compatibility directive).
It is the responsibility of the end user to ensure that the machine meets these standards.
