Motor Protection From Overheat; Dc Injection Brake; Starting Frequency; V/F Pattern Matching Applications - Mitsubishi Electric FR-F700 Manual
F700 series
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Also See for FR-F700:
- Instruction manual (135 pages) ,
- Technical manual (550 pages) ,
- Programming manual (216 pages)
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Motor protection from overheat
Pr.
Pr.
9
51
(electronic thermal relay function)
Pr.9 Electronic thermal O/L relay
Set the current of the electronic overcurrent protection to protect
the motor from overheat.This feature provides the optimum
protective characteristics, including reduced motor cooling
capability, at low speed.
This function detects the overload (overheat) of the motor, stops
the operation of the inverter's output transistor, and stops the
output.
Set the rated current [A] of the motor in Pr.9.
When using a motor with an external thermal relay, etc., set "0" in
Pr. 9 to make the electronic thermal relay function invalid. (Note
that the output transistor protection of the inverter (E.THT)
functions.)
When using the Mitsubishi constant-torque motor
1) Set "1" in Pr.71 .
(This provides a 100% continuous torque characteristic in the
low-speed range.)
2) Set the rated motor current in Pr. 9.
When the RT signal is on, thermal protection is provided based on
the Pr. 51 setting.
Use this function when rotating two motors of different rated
currents individually by a single inverter.
together, use external thermal relays.)
Pr.
DC injection brake
10 to 12
Pr.10 DC injection brake operation frequency
Pr.12 DC injection brake operation voltage
The DC injection brake can be operated at a motor stop to adjust
the stop timing and braking torque.
DC injection
Pr.12
Operation
brake
voltage
voltage
Pr.11 Operation time
Pr.
Starting frequency
13, 571
Pr.13 Starting frequency
You can set the starting frequency and hold the set starting
frequency for a certain period of time.
Set these functions when you need the starting torque or want
smooth motor drive at a start.
Output
frequency
(Hz)
60
Pr.13
0
Forward
rotation
29
indicates simple mode parameters and
Pr.
Pr.51 Second electronic thermal O/L relay
(When rotating two motors
Pr.11 DC injection brake operation time
When
Using the
Pr.12 Initial
Mitsubish
Value
Constant
Energy
Torque
Motor
Time
3.7K or less 4%
←
5.5K to 7.5K 4%
2% *
11K or more 2%
←
Time
75K or more 1%
←
* If the Pr. 71 initial value is changed
to the setting for use with a
constant-torque motor, the Pr. 12
setting
changes
to
corresponding value in the above
table.
Pr.571 Holding time at a start
Time
Pr.571 setting time
ON
indicates extended parameters. When setting parameters, refer to the instruction manual (applied) and understand instructions.
Pr.
Pr.
V/F pattern matching applications
14
Pr. 14 Load pattern selection
You can select the optimum output characteristic (V/F
characteristic) for the application and load characteristics.
Setting "0"
For constant-torque load
100%
Pr.3 Base frequency
Output frequency (Hz)
Pr.
15, 16
Pr.15 Jog frequency
You can set the frequency and acceleration/decelertion time for
jog operation. Jog operation can be performed from either the
outside or PU.
Can be used for conveyor positioning, test operation, etc.
Jog frequency
When
Using
Logic selection of output stop
Pr.
the
17
signal (MRS)
Saving
Motor
Pr.17 MRS input selection
←
The inverter output can be shut off by the MRS signal. The logic
3%
of the MRS signal can also be selected.
←
←
the
MRS signal
STF (STR)
signal
Refer to the section about Pr.1, Pr.2
Pr.
18
Pr.
Refer to the section about Pr. 3.
19
Pr.
20, 21
Setting "1" (initial value)
For variable-torque load
100%
Output frequency (Hz)
Jog operation
Pr.16 Jog acceleration/deceleration time
Output
frequency
(Hz) Pr.20
Pr.15
Forward
rotation
setting range
Reverse
rotation
Pr.16
JOG signal
ON
Forward
rotation STF
ON
Reverse
rotation STR
ON
Motor coasts
(Initial
Setting value "0"
value)
to stop
Inverter
Output
stop
MRS
SD (PC)
Time
ON
ON
Refer to the section about Pr.7, Pr.8
Pr.3 Base frequency
Time
Setting value "2"
Inverter
Output
stop
MRS
SD (PC)
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