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Protective Functions (pr. 870 To Pr. 874); Speed Deviation Excessive (pr. 870, Pr. 871) - Mitsubishi Electric FR-V560 Instruction Manual

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Protective functions (Pr. 870 to Pr. 874)

<Detailed operation>
The following table indicates the functional combinations of the terminals 1, 2 and 3.
Basically, the analog multiple functions are assigned to the terminal 1 alone and only one function may be selected
for the multi-function analog input.
Terminal 2
Control
Speed Command/
Method
Speed Restriction/
PID Set Point
Speed
Speed command
control
Speed restriction
Torque
control
No function
Position
No function
control
When the PID control function is selected, the terminal 2 is used for the PID set point. For PID control, refer to
page 152.
When the torque bias function is selected, the terminal 3 is used for the torque bias input.
REMARKS
Magnetic flux command is a function used to command magnetic flux (strength of magnetic flux) from the external analog
terminal (1). In addition to torque command "terminal 3", the inverter can control torque using magnetic flux as a command.
For example, the characteristic of motor torque is that output torque is constant independently of the output speed when
exercising line feed/tension constant control on a winder, unwinder, etc. Constant output control by variable magnetic flux,
equivalent to field excitation control of the DC shunt motor, can be exercised.
4.37 Protective functions (Pr. 870 to Pr. 874)
4.37.1 Speed deviation excessive (Pr. 870, Pr. 871
If the difference (absolute value) between the
speed command value and actual speed
exceeds the Pr. 870 "speed deviation level"
setting for longer than the time set in Pr. 871
"speed deviation time", speed deviation
excessive occurs and error "E. OSD" appears,
resulting in a stop.
Parameter
Name
870
Speed deviation level
871
Speed deviation time
REMARKS
1. Set these parameters when a speed difference will pose a problem.
2. This function is activated only under vector control with encoder.
3. When the motor with encoder is driven, setting the Pr. 851 "number of encoder pulses" value that is different from the
actual number of encoder pulses may make control unstable, resulting in "E. OSD" (even if Pr. 870 = 9999).
Terminal 3
Torque Restriction/
Torque Command/
Torque Bias
No function
(Pr. 810 = 0, Pr. 840=9999)
Torque restriction
(Pr. 810 = 1)
Torque bias
(Pr. 810=0, Pr. 840=1,2,3)
Torque command
No function (Pr. 810 = 0)
Torque restriction
(Pr. 810 = 1)
Alarm output
(across A-C)
Factory Setting
Setting Range
9999
0 to 1500r/min, 9999
12s
196
Terminal 1
Multi-function
Speed auxiliary setting
(Reversible operation also possible)
Magnetic flux command
Speed auxiliary setting
(Reversible operation also possible)
Magnetic flux command
Regenerative torque restriction
Speed setting auxiliary
Magnetic flux command
Speed restriction auxiliary input
Magnetic flux command
Forward/reverse rotation speed
restriction
(analog polarity switchover speed
restriction)
No function
Magnetic flux command
No function
Magnetic flux command
Regenerative torque restriction
with
without
Encoder
Encoder
)
Speed
(r/min)
Pr.870
Actual speed
Pr.871
OFF
ON
9999:Invalid
0 to 100s
- - -
Remarks
Factory-set status
Setting can be made
when Pr. 810 = 1.
Setting can be made
when Pr. 807=2.
Setting can be made
when Pr. 810=1.
Set speed
Time
Speed deviation
excessive error activated
(E. OSD)
Remarks
Extended mode

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