Rockwell Automation MD65 User Manual Version 2.0 - Manual (Page 164)

H-4 MD65 AC Drive User Manual
The step time value and the basic logic may be used together to
satisfy machine conditions. For instance, the step may need to run
for a minimum time period and then use the basic logic to trigger a
transition to the next step.
Timer Function
Digital inputs and outputs control the timer function and are
configured with Digital Inx Sel parameters (A051-A054) set to 18
“Timer Start” and 20 “Reset Timer”.
Digital outputs (relay and type) define a preset level and indicate
when the level is reached. Level parameters Relay Out Level
(A056), Opto Out1 Level (A059) and Opto Out2 Level (A062) are
used to set the desired time in seconds.
Parameters Relay Out Sel (A055), Opto Out1 Sel (A058) and Opto
Out2 Sel (A061) are set to option 16 “Timer Out” and causes the
output to change state when the preset level is reached.
Example
• Drive starts up and accelerates to 30 Hz.
• After 30Hz has been maintained for 20 seconds, a 4-20mA
analog input becomes the reference signal for speed control.
• The timer function is used to select a preset speed with a 20
second run time that overrides the speed reference while the
digital input is active.
• Parameters are set to the following options:
• Speed Reference (P038) = 3 “4-20mA Input”
Time
Logic In1
Logic In2
Frequency
Start Step 0 Step 1