2-22 Auto / Manual
Auto / Manual The intent of Auto/Manual is to allow the user to override the selected
reference (referred to as the “auto” reference) by either toggling a button on
the programming terminal (HIM), or continuously asserting a digital input
that is configured for Auto/Manual.
• “Alt” Function on the HIM
By toggling the “Alt” and “Auto/Man” function on the HIM, the user can
switch the speed reference back and forth between the active “Auto”
source (per drive programming and inputs) and the HIM requesting the
manual control. “Manual” switches the Reference Source to the HIM,
“Auto” switches it back to drive programming.
The HIM manual reference can be preloaded from the auto source by
enabling the [Man Ref Preload] parameter. With the preload function
enabled, when the HIM requests Manual control, the current value of the
auto source is loaded into the HIM reference before manual control is
granted. This allows the manual control to begin at the same speed as the
auto source, creating a smooth transition. If the preload function is
disabled, the speed will ramp to whatever manual reference was present
in the HIM at the time manual control was granted.
• Digital Input
By toggling the digital input programmed as Auto/Manual, the user can
switch the speed reference back and forth between the active “Auto”
source (per drive programming and inputs) and the designated Terminal
Block manual reference. When this digital input is asserted, the TB will
attempt to gain exclusive control (Manual) of the reference. If granted
control of the reference, the specific source for the reference is
determined by the parameter TB manual reference select.
The TB manual reference is selected in [TB Man Ref Sel]. The choices
for this parameter are:
– Analog Input 1
– Analog Input 2
– MOP Level
– Analog Input 3 (PF700 Only)
– Pulse Input (PF700 Only)
– Encoder input (PF700 Only)
– Releasing this input sends the control back to the Auto source.
General Rules
The following rules apply to the granting and releasing of Manual control:
1. Manual control is requested through a one-time request (Auto/Man
toggle, not continuously asserted). Once granted, the terminal holds
Manual control until the Auto/Man button is pressed again, which
releases Manual control (i.e. back to Auto mode).
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