Schneider Electric ALTIVAR 58 TRX - Manual (Page 56)

Altivar ® 58 TRX AC Drives
Assignment of Logic Inputs (LIx)
© 2000–2003 Schneider Electric All Rights Reserved
56
09/2003
Forced Local
This function allows a logic input to be assigned to force local control of the
drive controller. Configuration of this function is recommended when using
serial communication with the drive controller. This input is typically wired into
the Hand and Off positions of a Hand-Off-Auto selector switch when used in
conjunction with serial communication with the drive controller. Assigning this
parameter provides terminal block control when the logic input is closed
(state 1). Initiating this input overrides any commands being received over
the serial communications link and the drive controller responds to the inputs
given at the control terminal block. Parameter data can still be monitored over
the serial communication link.
Fault Reset
This function allows faults to be reset by a logic input assigned to this
function. Two types of reset are available. See page 66 for fault reset types.
External Fault
This function allows a logic input to be assigned to receive an external
contact closure to stop the drive controller and motor. The drive controller will
stop according to the controlled stop configuration. This function is useful in
applications where interlocking of various equipment and the drive controller
is required.
Reference Switching (Auto – Manual)
The Reference switching function permits switching between two analog
references by logic command. This function avoids switching of low-level
speed reference signals by other means, and enables the two reference
inputs AI1 and AI2 to be independent. To use this function, one logic input
(LI) must be re-assigned.
This function is typically used for:
• Machines with automatic/manual operation such as pumps
• Automatic control via a sensor on input AI2, validated by the logic input at
state 0
• Manual control via potentiometer on input AI1 (local control)
A graphical representation of reference switching and a connection diagram
are shown to the left.
Auto Tune
This parameter causes the drive controller to auto tune the connected motor.
When Auto Tune is initiated, the drive controller pulses the connected motor,
and measures and stores motor stator resistance and conductor resistance.
This allows the drive to provide better current regulation for improved motor
torque performance. Auto Tune can be initiated from the keypad or by a logic
input assigned to this function. If an output contactor is used, it is necessary
to close the contactor before the auto tune function is initiated.
f (Hz)
t
t
t
Forward
or
Reverse
LIx COM AI1 AI2
+ 24 V
0-20 mA
4-20 mA
20-4 mA
+ –
+
10
1
0
1
AI2
AI1
LIx 0
R
efSwitch.e
p s
Connection Diagram for Reference Switching
Remote
Signal
Reference Switching Timing and Wiring
Diagrams