Altivar® 58 TRX AC Drives
Assignment of Logic Inputs (LIx)
© 2000–2003 Schneider Electric All Rights Reserved
54 09/2003
+/– Speed
This function may also be referred to as the motorized potentiometer
function. It allows the speed reference to be increased or decreased using
one or two logic signals, with or without saving the last ref erence speed. T he
maximum speed is given by the reference applied to the analog inputs. For
example, connect AI1 to +10 Vdc. To use this function, two or three logic
inputs must be re-assigned.
This function is appropriate for:
• Applications involving centralized control of a machine composed of
several sections operating in one direction.
• Controlling a material handling crane operating in two directions with a a
pendant control station.
Two examples of this function are shown at the left.
Setpoint Memory
This function is associated with the +/– Speed function, and determines
whether the speed reference level is read and stored upon loss of the Run
signal or the mains supply. The stored reference is applied to the next Run
signal. The function may be set to either Yes (store reference signal) or No
(do not store reference signal).
Preset Speeds
The Preset Speeds function allows switching between 2, 4, or 8 preset
speeds, and requires 1, 2, or 3 logic inputs respectively. The function is
typically used with materials handling and machines with several operating
speeds. A typical example involving four speeds is shown to the left.
In this example, four speeds are obtained with inputs L I3 and L I4. At s tate 0,
the speed is LSP or the speed reference depending on the level of analog
inputs AI1 and AI2. The preset speeds may be adjusted from 0.1 Hz to the
maximum frequency. The factory default settings are:
• 1st Speed: LSP or reference.
• 2nd Speed: 5 Hz.
• 3rd Speed: 10 Hz.
• 4th Speed: HSP
NOTE: To reassign the logic inputs to a function other than Preset Speeds,
PS8 (LIz) must be cleared, then PS4 (LIy), then PS2 (LIx).
Preset Speed Logic
2 Preset Speeds 4 Preset Speeds 8 Preset Speeds
Assign LIx to PS2. Assign LIx to PS2, then LIy to PS4. Assign LIx to PS2, then LIy to PS4, then
LIz to PS8.
LIx Speed reference LIy LIx Speed reference LIz LIy LIx Speed reference
0LSP + AI reference00LSP + AI reference000LSP + AI reference
1 HSP 0 1 SP2 0 0 1 SP2
1 0 SP3 0 1 0 SP3
11HSP 011SP4
100SP5
101SP6
110SP7
111HSP
f
(
Hz
)
t
t
t
t
F
o
rw
a
r
d
or
R
e
v
e
r
s
e
S
p
ee
d
d
-
Speed
d
1
0
1
0
1
0
Pl
us
Mi
nus
E
x1.e
p
s
a b A B
LI1 LI2 LI3 LI4 +24 AIX
+/- Speed With Saving the Last Reference
Timing Diagram
+/- Speed Wiring Example
L
SP
f
(
Hz
)
Forw
a
r
d
or
R
e
v
e
r
se
LI11
1
LI3 0
1
LI4 0
LI2
0
PresetSpds.eps
H
SP
L
I1: Forward
L
I2: Reverse
L
I3: +Speed
L
I4: -Speed
ATV58 TRX terminal
Activate input
a or b, then
activate input
A or B.
Max. speed
Preset Speeds Timing Diagram
+Speed_-Speed Wiring (catalog).eps