Altivar 38 - variable speed drive - user's manual

Configurable I/O Application Functions
+/- speed: Two types of operation are available.
1 Use of single action buttons: two logic inputs are required in addition to the operating direction(s).
The input assigned to the “+ speed” command increases the speed, the input assigned to the “- speed”
command decreases the speed.
This function accesses the STr save reference parameter in the Control menu.
2 Use of double action buttons: only one logic input assigned to + speed is required.
+ speed/- speed with double action buttons:
Description: 1 button pressed twice for each direction of rotation.
Each action closes a volt-free contact.
Wiring example:
LI1: forward
LIx: reverse
LIy: + speed
Released
(- speed)
Press 1
(speed maintained)
Press 2
(+ speed)
forward button – a a and b
reverse button – c c and d
ATV38 control terminals
LI1 LIx LIy +24
b
d
ENGLISH
a
c
Motor
frequency
LSP
0
LSP
Forward
Press 2
Press 1
0
Reverse
b
b
a a a a a a a
Press 2
Press 1
0
c
d
c
This type of +/- speed is incompatible with 3-wire control. In this case, the - speed function is automatically
assigned to the logic input with the highest number (for example: LI3 (+ speed), LI4 (- speed)).
In both cases, the maximum speed is given by the references applied to the analog inputs. For
example, connect AI1 to the +10V.
108