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Protection
•
Ensure that primary protection exists for the input wiring to the equipment. This protection must be
able to interrupt the fault current from the power line. The equipment may or may not be equipped
with an input disconnect (option).
•
All cable entry openings must be sealed to reduce the risk of entry by vermin and to allow for
maximum cooling efficiency.
•
External dynamic braking resistors must be thermally protected.
•
If the ASD is supplied with a motor as a package, it then becomes a machine and has to meet the
Essential Health and Safety Requirements of the EU Machinery Directive, 2006/42/EC. It is also a
requirement that the system have an Emergency Off function that meets the requirements of EN
ISO 13850:2008, and that any local or regional requirements must be met.
•
It is the responsibility of the ASD installer/maintenance personnel to set up the Emergency Off
braking system of the ASD. The function of the Emergency Off braking function is to remove
output power from the ASD in the event of an emergency. A supplemental braking system may also
be engaged in the event of an emergency. For further information on braking systems, see
parameters
Note:
A supplemental emergency stopping system should be used with the ASD. Emergency
stopping should not be a task of the ASD alone.
•
Follow all warnings and precautions and do not exceed equipment ratings.
Dynamic Braking Resistor Requirements
When using a Dynamic Braking Resistor (DBR), use thermal protection and an input contactor that
will open the input 3-phase power circuit to the ASD in the event that a DBR over-temperature
condition occurs. In the event of a power source over-voltage condition or an ASD failure, the input
contactor will prevent hazardous DBR temperatures.
Dynamic Braking Resistors shall be connected across terminals PA and PB ONLY (when used).
Connecting a Dynamic Braking Resistor elsewhere may cause a fire.
Heavy duty DBRs shall be wired using the same gauge wire as the motor leads. Light duty DBRs may
use one wire size smaller (AWG) than the motor leads.
The total wire length from the ASD to the DBR shall not exceed ten feet.
Because the heat generated by the DBR will affect the cooling capacity of the ASD heat sink, the
resistor pack shall be mounted above or to the side of the ASD — Never below the ASD. Maintain a
minimum of six inches between the resistor pack and the ASD unit.
If EMI/RFI noise is of concern, the DBR wiring shall be three-core screened cable. The screen shall
connect to the ASD enclosure and the resistor enclosure.
6
F250
and F304.
DANGER
HX7+ ASD Installation and Operation Manual
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