Mitsubishi Electric FR-V500 Series Instruction Manual page 46

(1) When Pr. 807 = 0
The speed command value during speed control
acts as a speed limit level. At this time, according to
the acceleration/deceleration time set in Pr. 7
"acceleration time" and Pr. 8 "deceleration time",
the limit level is increased from 0r/min upon start,
and when the start signal turns off, the speed limit
level is decreased from the then speed limit level to
the DC injection brake operation speed in Pr. 10 to
a stop. The speed limit level at this time is shown
on the right.
1) External analog speed limit (terminal 1, 2)
The analog signal (0 to +10V (±10V)) input to terminal 2 (or terminal 1) is
used to give a speed limit command.
REMARKS
• Set Pr. 73 "speed setting signal" to change between the main speed and override of terminal 2.
( Refer to the Instruction Manual (detailed).)
• If the above speed limit command is greater than Pr. 1 "maximum speed", the speed limit value is regarded as the Pr. 1
"maximum speed" value. If the speed limit command is smaller than Pr. 2 "minimum speed", the speed limit value is
regarded as the Pr. 2 "minimum speed". Similarly when the speed limit command is smaller than Pr. 13 "starting speed", the
speed limit value is 0r/min.
• Set the speed limit of terminal 1 using Pr. 868 "terminal 1 function selection".
( Refer to the Instruction Manual (detailed).)
2) Speed limit on multi-speeds
The speed limit command can also be set for the external signals (RH, RM, RL).
(The terminals are factory-set as follows. DI1 = RH, DI2 = RM, DI3 = RL)
REMARKS
The RH, RM and RL signals are assigned to terminals DI1 to DI4 using Pr. 180 to Pr. 183 and Pr. 187 (input terminal function
selection).
CAUTION
When speed limit is to be made using the analog command (terminal 2), turn off the external signals (RH,
RM, RL). If any of external signals (RH, RM, RL) is on, multi-speed limits are made valid.
REMARKS
• Changing the terminal assignment using Pr. 180 to Pr. 183 and Pr. 187 (input terminal function selection) may affect the
other functions. Make setting after checking the functions of the corresponding terminals.
• If the value set in Pr. 187 is other than "9999", the external command cannot be used to perform reverse rotation operation.
To start reverse rotation, set "9999" (factory setting) in Pr. 187 to make the STR signal of terminal STR valid.
• When the above speed limit command is greater than the Pr. 1 "maximum speed" value, the speed limit value is the Pr. 1
"maximum speed" value, and when the speed limit command is less than the Pr. 2 "minimum speed" value, the speed limit
value is the Pr. 2 "minimum speed" value. When the speed limit command is less than the Pr. 13 "starting speed" value, the
speed limit value is 0r/min.
• When external speed limit is to be made using analog, calibrate the terminal 2 (terminal 1). Refer to Pr. 902 "speed setting
terminal 2 bias" and Pr. 903 "speed setting terminal 2 gain". Refer to Pr. 902 "speed setting terminal 2 bias" and Pr. 903
"speed setting terminal 2 gain" for the terminal 1. (Refer to page 51.)
(2) For Pr. 807 = "1 or 2", refer to the Instruction Manual (detailed).
4.2.7 Torque control accuracy improvement
To eliminate the temperature drift of torque under torque control, change the Pr. 95 "online auto tuning" setting to
"2". (Refer to page 50.)
For torque control, easy gain tuning has no effect.
When an unfavorable phenomenon such as torque pulsation occurs or when you want to exhibit the best
performance according to the machine, refer to the Instruction Manual (detailed) to perform a manual gain
adjustment (Pr. 824 to Pr. 827).
Torque control operation
Speed setting acts as
speed limit level in both
forward rotation and
reverse rotation.
Pr. 7
Start signal
43
Speed limit operation
Pr. 8
Torque
controllable range
10E (+10V)
2 (0 to +10V)
5 (Analog common)
4