12.3 b: Application
754 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
The drive usually uses the acceleration and deceleration times set in C1-xx [Accel and Decel Times], but when PID
control is enabled, the drive applies C1-xx after PID output. If you frequently change the PID setpoint, the drive
responsiveness decreases. When resonance with PID control causes hunting, overshoot, or undershoot, set b5-17 for
longer acceleration and deceleration times.
Decrease C1-xx until hunting stops, then use b5-17 to check the acceleration and deceleration. To enable and disable
the setting in b5-17 through an MFDI terminal, set PID Soft Starter Disable [H1-xx = 34].
■ b5-18: b5-19 PID Setpoint Selection
No.
(Hex.)
Name Description
Default
(Range)
b5-18
(01DC)
b5-19 PID Setpoint Selection
Sets the function that enables and disables b5-19 [PID Setpoint Value].
0
(0, 1)
0 : Disabled
The drive does not use the value set in b5-19 as the PID setpoint.
1 : Enabled
The drive uses the value set in b5-19 as the PID setpoint.
■ b5-19: PID Setpoint Value
No.
(Hex.)
Name Description
Default
(Range)
b5-19
(01DD)
RUN
PID Setpoint Value
Sets the PID setpoint when b5-18 = 1 [b5-19 PID Setpoint Selection = Enabled].
0.00%
(0.00 - 100.00%)
■ b5-20: PID Unit Selection
No.
(Hex.)
Name Description
Default
(Range)
b5-20
(01E2)
PID Unit Selection
Sets the number of digits to set and show the PID setpoint.
1
(0 - 3)
Set the units for these parameters and monitors:
• b5-19 [PID Setpoint Value]
• b5-58 [PID Setpoint2]
• b5-59 [PID Setpoint3]
• b5-60 [PID Setpoint4]
• U5-01 [PID Feedback]
• U5-04 [PID Setpoint]
• U5-99 [PID Setpoint Command]
0 : 0.01Hz units
The drive uses 0.01 Hz units.
1 : 0.01% units
The drive uses 0.01% units. Set the value as a percentage of E1-04 [Maximum Output Frequency].
2 : rev/min
The drive uses 1 rev/min unit. Set E2-04, E4-04, or E5-04 [Motor Pole Count].
3 : User Units
The drive uses the units set in b5-38 [PID User Unit Display Scaling] and b5-39 [PID User Unit Display Digits] to
show the PID setpoint in U5-01, U5-04, U5-06 [PID Feedback, PID Setpoint, PID Fdbk-Diff PID Fdbk].
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