Glossary
G-2 ACS 502 Installation & Start-up Manual
Field Weakening Point This is the point at which the output voltage no longer increases as the output
frequency is increased. Operation above this point results in reduced motor
torque capability while the output kVA remains constant. Refer to Parameter
20.4.4 (Field Weak Point).
Group A Group is the second of three display levels in ACS 502/504 programming.
Groups group parameters by their functionality, and provide access to them in
the same way that Mains provide access to Groups. Groups appear within
their respective Mains. For example, if you need to access Group 20.4 or
Group 20.3, you must first select Main 20 using specific Keypad procedures.
Refer to Chapter 2 – Overview of the ACS 502/504.
IGBT An IGBT is a fast switching power transistor. ACS 502/504 drives use these
in the inverter section as part of the process of changing DC voltage to AC
voltage.
I
R
This notation abbreviates the constant torque rated output current, in amperes,
of an ACS 502/504.
I
RSQ
This notation abbreviates the rated variable drive output current, in amperes,
of an ACS 502/504.
I
N
This notation abbreviates the current which the drive trips and on which
settings are based.
Inverter The inverter changes DC power to AC power for application to the motor
windings. Control of the inverter affords variable frequency and voltage to be
applied to the motor for control of motor speed and direction.
IR Compensation IR Compensation is a parameter that provides the motor with extra torque at
motor speeds between 0.1 Hz and the set Field Weakening Point. Refer to
Parameter 20.4.4 (Field Weak Point) and Field Weakening Point in this
glossary.
Joystick Control Joystick control allows you to use a joystick for external speed and direction
drive control through analog input AI1. Refer to Parameter 10.2.2 (External
Ref1 Sel).
Line Voltage Line voltage in this manual means the input voltage that provides power to the
ACS 502/504. Line voltage is connected to the ACS 502/504 Terminals L
1
,
L
2
, and L
3
. Refer to Start-up Data Parameter D (Supply Voltage). Refer to
Supply Voltage in this glossary.
Living Zero The Living Zero function allows the ACS 502/504 to detect a loss of
reference signal. Set Parameter 10.5.1 (Minimum AI1) to a value greater than
0.3 V/0.6 mA for a Living Zero function. You can then supervise the presence
of a control signal by setting Parameter 30.1.2 (AI < Min Function) to
WARNING or FAULT. A Warning or Fault message will then display if the
analog input falls below the set minimum.
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