
B–65192EN/02
4. AC LINE FILTER AND SEPARATE
REGENERATIVE DISCHARGE UNIT
21
(1) If a servo motor releases a large amount of regenerative discharge,
which exceeds the regenerative discharge capacity of the regenerative
discharge resistor in the servo amplifier, it is necessary to use a
separate regenerative discharge unit.
(2) If the motor regenerative discharge R calculated in Subsec. 4.2.1 for
each axis exceeds the regenerative discharge capacity of the
regenerative discharge resistor in the servo amplifier listed in Table
4.2.2 (a) , use a separate regenerative discharge unit. If R exceeds also
the regenerative discharge capacity of the regenerative discharge
resistor in the separate regenerative discharge unit listed in Table
4.2.2 (b) , contact FANUC and ask for information. (If a machine has
a high holding torques on its vertical axis with no counter balance, a
large amount of high regenerative discharge occurs when the load
moves down along the vertical axis. In such a case, especially if the
machine has a long stroke and the load descends rapidly, the amount
of generated regenerative discharge may exceed the regenerative
discharge capacity of the separate regenerative discharge unit. )
(3) The regenerative discharge capacity of the regenerative discharge
resistor in the following units can be increased by cooling the resistor
with an external cooling fan: separate regenerative discharge units
A06B–6089–H510 and H500, and servo amplifiers (A06B–6089–
H104, H105, and H201 to H210) and (A06B–6090–H004, H006, and
H222 to H266).
Tables 4.2.2 (a) and (b) list the relationships between the speed of
cooling air flow and the regenerative discharge capacity.
(4)
The separate regenerative discharge units listed in Table 4.2.2 (b) have been
developed for use with the α series servo amplifier units. These discharge
units comply with European safety standards (VDE 0160). The separate
regenerative discharge units for the C series servo amplifier units can
be used for the α series servo amplifier units. However they have not
been designed to meet the requirements of the European standards.
NOTE
The CE marking (machinery directive) cannot be affixed to
a machine using the SVUC.
4.2
SEPARATE
REGENERATIVE
DISCHARGE UNIT