HVAC400X – APPLICATION MANUAL
99
EN2B-0417GE51 R0719
Suite: I/O START/STOP LOGIC
Selection number Selection name
Description
6
AI1 Start Threshold
Special start mode where no separate start signal is needed.
Increasing the value of AI1 will act as a
Start
command. AI1 threshold
(P3.2.8) described in the figure below creates a safety margin to
prevent unintentional starts. Consequently, the drive will start only
after the value of AI1 exceeds the threshold. Control signal 2 can be
used for changing the rotation direction.
Fig. 17. AI1 start threshold
Legend
A.
Start command.
D.
1 = Enabled.
B.
AI1 threshold -2%.
E.
0 = Disabled.
C.
AI1 threshold.
P3.2.7 I/O B START/STOP LOGIC (ID 363)
You can use this parameter to control the start and stop of the drive with the digital signals. The selections can
include the word 'edge' to help you prevent an accidental start. See P3.2.6 for more information.
P3.2.8 AI1 START THRESHOLD (ID 185)
You can use this parameter to set the threshold level to start the HVAC drive from Analog Input 1 when the
Start/Stop Logic is set to AI1. If P3.2.6 (I/O Start/Stop Logic) is set to value
5
(AI1 threshold) the motor starts at the
level set with this parameter and stops at the same value -2%. AI1 can also be used as a frequency reference at
the same time.
P3.2.9 FIELDBUS START LOGIC (ID 889)
You can use this parameter to set the fieldbus start logic. The selections can include the word 'edge' to help you
prevent an accidental start.
AI1
A
C
B
D
E
0%
100%
