Programming 5 - 25 – Yaskawa P7B Drive Bypass User Manual

Page 119

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Programming 5 - 25

Discussion of Table 5.4 Options Dependent, PI Control Bypass Parameter Settings:

Typical Drive Parameter Settings for PI Control with Various Combinations of Bypass and Control Options

Notes:

For project specific PI control tuning see the PI Control (b5-XX) parameters in this chapter. Tables 5.3 and 5.4
provide the basic configuration for PI Control from a Drive in an E7 Bypass unit. The b5-XX parameters are
defaulted to a good starting point for most HVAC applications. Final adjustment to some of the b5-XX parameters for
the project at hand may be required.

Hand mode run/stop for Drive and Bypass is always via the front control panel HAND/OFF/AUTO switch.

Options - None;

Bypass with PI Control and no options:

Hand mode speed command from Keypad/Operator.
Auto mode PI Setpoint from Keypad/Operator.
Auto mode PI Feedback input signal, 4-20 mA applied to Drive terminal A2.
Auto mode run/stop contact closure for Drive and Bypass applied to terminals TB1-3 and TB1-4.

Options - None;

Bypass with PI Control and no options:

Hand mode speed command from Keypad/Operator.
Auto mode PI Setpoint from Keypad/Operator.
Auto mode PI Feedback input signal, 0-10 VDC applied to Drive terminal A2.
Auto mode run/stop contact closure for Drive and Bypass applied to terminals TB1-3 and TB1-4.

Significant

Parameter Setting

Result

b1-01 = 0: Operator

Speed command (Hand) and PI setpoint (Auto) sourced = Keypad/Operator (U1-01)

b5-01 = 1: Enable

Enable PI mode of operation

H1-03 = 19: PI Disable

A terminal S5 input contact closure disables PI mode. This input contact is closed
when H/O/A = Hand.

H3-08 = 2: 4-20 mA (default)

Terminal A2 is programmed for 4-20 mA (Note – Control PCB DIP switch S1-2
must also be ON)

H3-09 = B: PI Feedback

Terminal A2 function is set to provide PI feedback for closed loop control

H3-13 = 1: Main Fref TA2

Terminal A2 (the feedback terminal) serves as the main input