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APEX615n Installation Guide
The APEX615n controller/drive's internal IGBT power switch is the component that
determines the above specifications. With the standard external resistors discussed previously,
the switch is already at its peak power dissipation level. However, the switch can dissipate
more continuous power than the standard resistors allow. Your network, therefore, can
dissipate additional continuous power, but must not dissipate more peak power. This is
shown in the table above.
To use an external network, you must take the following two steps.
1. Set DIP Switch 1, position #1, in the ON position. This disables the APEX615n's
Regen Fault circuit.
2. Disconnect the internal regeneration resistor.
Step 2 above requires opening the APEX615n's cover. Please call Compumotor’s Application
Engineering Department (see the inside front cover of this Installation Guide for the toll free
number) for instructions on opening the cover and disconnecting the resistor, and to obtain
information about designing your external resistor network.
Sharing the High Voltage Power Bus, using
V Bus+
and
V Bus–
In some applications with multiple APEX615n units, one or more may continuously receive
regenerated power from their loads. For example, in a tensioning application, two APEX615n
units apply tension (opposite torques) to a single moving load. In this situation, one
APEX615n could receive substantial regenerated power from its motor.
In such applications, you can connect the power buses from the APEX615n in parallel,
through the V BUS+ and V BUS– terminals, located on the motor connector. With the buses
connected in parallel, the regenerated power from one APEX615n is dissipated by the power
consumption of the other. Otherwise, all of the regenerated power would be continuously
dumped into the APEX615n’s own internal resistor.
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