Speed Change Function - Mitsubishi Q Series User Manual

11 SUB FUNCTIONS
[2] Setting the speed limit function
Setting item
Pr. 5 Speed limit value
Refer to section "4.2 List of parameters" for setting details.

11.3 Speed change function

The "speed change function" is designed to change the speed within the " Pr. 5 Speed
limit value" range at any point during speed control of speed-position switching control
or during JOG operation.
Set a new speed in " Cd. 7 New speed value" and make a speed change using " Cd. 6
Speed change request".
The acceleration and deceleration times after a speed change are the values set in
" Cd. 8 ACC/DEC time at speed change" and " Cd. 9 DEC/STOP time at speed
change".
The details shown below explain about the "speed change function".
[1] Control details
JOG. 1 JOG speed
Pr. 6 Bias speed
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To use the "speed limit function", set the "speed limit value" in the parameters
shown in the following table, and write it to the QD70.
(The "speed limit value" depends on the motor used. Set it according to the motor
used.)
The setting is made valid when the PLC READY signal [Y0] turns from OFF to
ON.
Setting
value
Set the speed limit value (max. speed during control).
[1] Control details
[2] Precautions during control
The following is the operation performed during a speed change for JOG
operation.
Speed change to V2
V
V1
Deceleration made at
value set in Cd. 8
at start
JOG. 2 JOG ACC time
JOG start
OFF
Fig. 11.1 Speed change operation
Setting details
Speed change to V3
Operation performed when speed
V3 change is not made
V2
Acceleration made at
value set in
t
Deceleration stop made at
value set in
ON OFF
MELSEC-Q
Factory-set
initial value
10000 (pulse/s)
Cd. 8
Cd. 9
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