Rockwell Automation Publication 6000-TD004D-EN-P - November 2017 11
Functional Descriptions Chapter 1
Take note of the following:
• When HMI is selected, the HMI converts the frequency reference to a
value from 0...100 and sends it to the controller. The controller converts
the received value to a unified data value from 0...10000 for internal
calculations within the controller and computes the given frequency to be
sent to the DSP.
• When the potentiometer is selected, the 0-10V signal sent to the controller
is adjusted using the potentiometer. The controller processes the signal and
computes the given frequency to be sent to the DSP (If the wiring is
disconnected, the frequency reference value changes to zero and there will
be no message prompt).
• When analog 4-20 mA is selected, the controller processes the signal and
computes the given frequency to be sent to the DSP.
• When 4-speed governor is selected, the four frequency values stored in
parameters 4-Step Variable Speed - Speed1, 4-Step Variable Speed - Speed2,
4-Step Variable Speed - Speed3, and 4-Step Variable Speed - Speed4 are used.
These parameters correspond to the controller input points I-24, I-25, I-
26, and I-27.
When the controller receives an input at a high level from an input point
that corresponds to a frequency reference stored in one of the 4-Step
Variable Speed parameters, the drive frequency reference is set to that
value. For example, when the input I-24 is at a high level, the value of 4-
Step Variable Speed - Speed1 is read as the frequency reference of the drive
and so on.
• When remote communication is selected, the frequency reference value is
provided by the remove communication with a range from 0...1000
(1000 = maximum frequency reference).
When there is a fault between the host computer and remote
communications, the drive response is determine by the value set in
parameter When Disconnected Between DCS and PLC (P485) and
described as follows:
– P485= 0; The drive stops immediately.
– P485 = 1; The drive continues running at current frequency.
– P485 = 2; The drive continues running at frequency set in
4-step Variable peed - Speed1.
– P485 = 3; The drive continues running at frequency set in
4-step Variable Speed - Speed2.
– P485 = 4; The drive continues running at frequency set in
4-step Variable Speed - Speed3.
– P485 = 5; The drive continues running at frequency set in
4-step Variable Speed - Speed4.
• When Remote box is selected, the frequency reference is set by using the
acceleration/deceleration button on the HMI, or the acceleration/
deceleration button on the remote control box. The frequency step size is
determined by the value of Frequency Step For Acceleration Or Deceleration
(P493).
To Next Page
Loading...
Need help?
General
