48
Part 1 Installation
7.6 Connecting Regenerative Resistance Units (RB)
Regenerative energy produced when the actuator decelerates to a stop or moves downward in a vertical
installation is absorbed by means of the capacitor or resistor in the controller. If the produced regenerative
energy cannot be fully absorbed internally, a “60C: Power-system overheat error” will generate. If this happens,
connect one or more external regenerative resistance units. If your SSEL controller is used with a vertically
installed actuator, connect an external regenerative resistance unit(s) as necessary.
7.6.1 Number of Units to Be Connected
Reference for required number of units
Total wattage of 2 motor axes
Vertical installation
Number of regenerative
resistance units to be connected
~ 200 W
Not required
~ 600 W
1
~ 800 W
2
* The above are reference numbers by assuming that each actuator is operated back and forth at 3,000
rpm, 0.3 G, rated load, 1,000-mm stroke and 50% duty.
* If the operation duty exceeds 50%, more regenerative resistance unit(s) may be required than as
specified in the above table.
A maximum of four external regenerative resistance units can be connected.
(Never connect any greater number of regenerative resistance units, as it may cause system
breakdown.)
7.6.2 Connection
Method
The figure below illustrates how one regenerative resistance unit, and two or more regenerative resistance units,
can be connected.
When one unit is connected, use the cable specified in [1] of 7.6.3 on the next page. If two or more units are
connected, use the cable specified in [1] for connection between the controller and the first regenerative
resistance unit, and the cable specified in [2] for connection between regenerative resistance units.
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