Rockwell Automation 1336E IMPACT Adjustable Frequency AC Drive User Manual V 1-4.XX User Manual
Page 128
8-4
Using the SCANport Capabilities
Ownership is when a SCANport device commands a function. As
long as that function is commanded, that device is the owner of that
function. For example, if device 1 is commanding a forward direction,
which is a one owner function, no other device can change the
direction until device 1 stops commanding the forward direction. If
device 1 is sending a start command, which is a multiple owner
function, other devices can also command a start. If device 1 stops
commanding the start, the drive does not stop running if another
device is still commanding the start.
By default, start commands from SCANport devices are 3-wire
(latched). If you want a SCANport device to use a 2-wire start
(unlatched), you need to set the appropriate bit in SP 2 Wire Enable
(parameter 181).
Notes Regarding 2 and 3-Wire Operation
When using 3-wire operation:
•
Start is momentary (latched).
•
A low to high transition on the start input is required to start the
drive.
•
All 2/3-wire start inputs must be low before a low to high
transition will start the drive.
•
Stop input unlatches and stops the drive.
•
To make 3-wire starts operate like a 2-wire start, you need to
wire — OR the start and stop inputs.
•
The drive will not start if the stop input is open, the enable input
is open, or the drive is faulted. Use Drive/Inv Status
(parameter 15) bit 0, Run Ready, to know when the drive is ready
to start.
When using 2-wire operation:
•
Run Fwd/Rev is maintained (unlatched).
•
A low to high transition on either Run Fwd/Rev input is required
to start the drive.
A rising edge is required for start and jog functions. If a jog or start
is still commanded after the drive is stopped, start and jog functions
will not operate from any device until the jog or start commands are
removed.
To use a 2-wire start for:
Set this bit:
SCANport device 1
1
SCANport device 2
2
SCANport device 3
3
SCANport device 4
4
SCANport device 5
5
SCANport device 6
6
Logic Cmd Input (parameter 197)
7