General Information About Your Acs 501; Features And Functions - ABB ACS 501 Installation & Start-Up Manual

Chapter 2 – Overview of the ACS 501
General Information
About Your ACS 501

Features and Functions

Component Descriptions
2-2
A diode bridge converts line power almost entirely to active power. The
displacement power factor approaches unity (>0.98) regardless of the speed or
load of the connected motors.
The DC-Intermediate Circuit filters the DC-voltage ripple supplied by the
Rectifier Stage. This section consists of an inductor and capacitors, as well as
a charging circuit. The charging circuit limits the in-rush current when power
is applied by directing the current through a resistor. Once the bus is charged,
the resistor is shorted with a relay or SCR.
Note: 600 VAC units have an AC choke in place of the DC choke.
Note: The maximum number of chargings in one minute is four. In
applications where frequent start/stop is required, electronic start/stop
should be used with the unit powered continuously.
The Inverter Stage forms symmetrical three-phase AC voltage from the
constant DC voltage supplied by the DC-Intermediate Circuit.
A Motor Control Card controls the Inverter Stage and monitors the operation
of the ACS 501.
A Control Interface Card is the link between the operator and the ACS 501. It
features a Control Panel with an alphanumeric display and keypad. A terminal
block for external control connections is also located on the Control Interface
Card.
The Control Interface Card is optically isolated from the line potential. The
Control Interface Card common is connected to the chassis ground through a
10 megohm resistor.
Figure 2-2 shows a diagram of the hardware components and control
functions of the ACS 501.
ACS 501 Installation & Start-up Manual