6-1
Chapter 6 SPEED CONTROL
Using a PG feedback signal enables V/f control with PG and dynamic vector control with PG.
It speed-controls the detection speed of the motor via the PG and compensates the frequency with
PI control so that the motor speed follows the speed command.
The speed control with PG can be enabled concurrently with the frequency control with pulse rate
input and positioning control.
6.1 Specifications
Table 6.1 lists the specifications of speed control with PG.
Table 6.1 Specifications of Speed Control with PG
Item Specifications Remarks
Speed control range 180 to 3600 r/min
Control
Speed control accuracy ±0.2% of maximum speed
When running at constant speed
(The maximum speed refers to
the speed corresponding to the
maximum frequency.)
Electrical
specifications
Input pulse rate 75 p/s to 30 kp/s
Maximum wiring length: 20 m
when using A/B phase pulse
input
6.2 Terminal Functions
Table 6.2 lists terminal functions.
Table 6.2 Terminal Functions
Location
Terminal
symbol
Name Functions
PI Power input terminal
Receives power for the PG from an
external source.
PO Power output terminal Outputs power to the PG.
CM Common terminal Common terminal for the PG power.
YA
Feedback input terminal for A phase
pulse train
Receives an A phase feedback pulse
train.
YB
Feedback input terminal for B phase
pulse train
Receives a B phase feedback pulse
train.
PG
interface
card
YZ
-- Reserved.
Inverter
Terminal [X]
(Note)
"Switch speed control" terminal
Temporarily cancels speed control with
PG.
The pulse count of [YA] and [YB] terminal inputs can be displayed on the keypad b
using Menu #4 "I/O Checking," Check item 4_17. For details, refer to the inverter’s
instruction manual. (See the description of function code E52.)
(Note) "Switch speed control" terminal
Setting "27" to any of function codes E01 to E05, E98 and E99 assigns the "Switch speed control" command
PG/Hz to the corresponding one of digital input terminals [X1] to [X5], [FWD] and [REV]. This setting enables
the assigned terminal to be used for cancelling the speed control with PG. While the inverter is running,
turning this terminal on or off will be ignored. After the inverter stops, it will be validated. If no PG/Hz is
assigned, speed control with PG is always enabled.
Table 6.3 Function of PG/Hz Terminal Command
Terminal command PG/Hz Function
ON Enable speed control with PG
OFF Disable speed control with PG
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