Yaskawa E7B Drive Bypass - Manual (Page 22)

Physical Installation 1 - 10
Option R - 3% Input Line Reactor: Employed on the input side of the Drive for Total Harmonic Distortion (THD) suppres-
sion. A line reactor also minimizes the potential for Drive input diode damage from line transients and reduces voltage peaks
on the DC bus capacitors. This option is installed on the input power side of the Drive, between the input contactor and the
Drive.
Option S - Speed Potentiometer: A door mounted single turn potentiometer for manual control of Drive output and motor
speed. This option is wired to Drive terminals +V, A1 and AC and is used as the local speed command input to the Drive
instead of the keypad up and down arrows. Parameters for use of this option in conjunction with other input signals are
detailed in Table 5.2.
Option W - Engraved Plastic Nameplate: An enclosure identification nameplate to carry the controlled equipment “tag
number”.
Option X - 3% DC Bus Reactor: Attenuates harmonic distortion by limiting the rate of rise of the input current. The bus
reactor is wired to the Drive (+1) and (+2) DC bus terminals to provide the equivalent impedance of a 3% input reactor. This
option is only used on the low end of the horsepower range where DC bus reactors are not a standard Drive component (25 HP
and below @ 208 VAC, 25 HP and below @ 240 VAC, and 30 HP and below @ 480 VAC.)
Option Z - 5% DC Bus Reactor: Attenuates harmonic distortion by limiting the rate of rise of the input current. The bus
reactor is wired to the Drive (+) and (-) DC bus terminals to provide the equivalent impedance of a 5% input reactor. This
option is only used on the low end of the horsepower range where DC bus reactors are not a standard Drive component
(25 HP and below @ 208 VAC, 25 HP and below @ 240 VAC, and 30 HP and below @ 480 VAC.)