Programming 5 - 37
Fig. 29 Frequency Bias Applied to Analog Speed Command
Function: Aux Reference
Setting: 2
In order for the A2 analog input to be used as the master Speed Command, parameter H3-09 must be set for Aux Reference
(H3-09= “2: Aux Reference”). Once A2 is configured as an auxiliary reference, it can be selected as the master Speed
Command by setting H3-13= “1: Main Fref TA2”. If H3-09= 2, terminal A2 analog input will become the speed command
when a digital input programmed for Multi-Step Ref 1 (H1-0x= 3) is selected by a contact closure.
Function: PI Feedback
Setting: B
Configuring the A2 analog input as PI Feedback (H3-09= “B: PI Feedback”) is a requirement of setting the Drive up for PI
operation. The A2 analog input is the only source for feedback for PI operation though the setpoint can come from a number
of different sources (refer to the section covering the PI parameters for more information regarding specifying the setpoint
source. PI parameters are listed in section b5).
Parameters H3-10 (Terminal A2 Gain) and H3-11 (Terminal A2 Bias) can be used to configure the A2 analog input to match
the signal from the Feedback Transmitter.
The U1-24 monitor (PI Feedback) can be used to check the PI Feedback level with the digital operator.
Function: Frequency Bias 2
Setting: D
By setting H3-09= “D: Frequency Bias 2”, the A2 analog input will serve as a bias signal to the A1 Speed Command. This
setting functions the same as a setting of H3-09=0: Frequency Bias.
Fig. 30 Frequency Bias 2 Applied to Analog Speed Command
Factory Default
Speed
10V
A1 Voltage
Speed
A1 Voltage
10V
H3-03
H3-02
With H3-03 applied
Speed
A1 Voltage
10V
With both H3-03 and analog input bias
(H3-09=0) applied
H3-02
H3-03
Speed
Command
Speed
Command
Speed
Command
Factory Default
10V
A1 Voltage
Speed
A1 Voltage
10V
H3-03
H3-02
With H3-03 applied
Speed
A1 Voltage
10V
With both H3-03 and analog input bias
(H3-09=0) applied
H3-02
H3-03
Speed
Command
pee
Command
Speed
Command
(H3-09=D) applied
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