122
Selection and protection of a motor
(6) PTC thermistor protection
(Pr. 561)
PTC thermistor input connection
PTC thermistor characteristics
Terminal 2 and terminal 10 are available for inputting of motor
built-in PTC thermistor output. When the PTC thermistor input
reaches to the resistance value set in
Pr. 561 PTC thermistor
protection level
, inverter outputs PTC thermistor operation error
signal (E.PTC) and trips.
Check the characteristics of the using PTC thermistor, and set
the resistance value within a protection providing temperature
TN, just around the center of R1 and R2 in a left figure. If the
Pr.
561
setting is closer to R1 or R2, the working temperature of
protection goes higher (protection works later), or lower
(protection works earlier).
PTC thermistor resistance can be displayed in operation panel,
parameter unit (FR-PU07)
, or RS-485
communication
when PTC thermistor
protection is active (
Pr. 561
"9999").
REMARKS
When using terminal 2 as PTC thermistor input (
Pr. 561
"9999"), terminal 2 is not available for analog frequency command.
Also, terminal 2 is not available for analog frequency command when using terminal 2 for PID control. When PID control is not
active (
Pr. 128
PID action selection
= "0"), terminal 4 functions as follows.
When
Pr. 79
= "4" or in External operation mode ............... Terminal 4 is active whether AU signal is ON/OFF
When
Pr. 79
= "3" ............................................................... Terminal 4 is active for frequency command when AU signal is ON
For the power supply terminal of PTC thermistor input, do not use power supply other than terminal 10 (external power supply,
etc). PTC thermistor does not work properly.
Parameters referred to
Pr. 71 Applied motor
Pr. 72 PWM frequency selection
Pr. 79 Operation mode selection
Pr. 128 PID action selection
Pr. 178 to Pr. 182 (input terminal function selection)
Pr. 190, Pr. 192 (output terminal function selection)
Inverter
U
V
W
10
2
Motor
R2
R1
Pr. 561
TN
TN+
Δ
T
TN-
Δ
T
Thermistor
temperature
TN: Rated operational temperature
Thermistor
resistance
Thermistor curve
Temperature-resistance
existing range
Содержание FR-F700PJ Series
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Страница 346: ...341 APPENDIX This chapter provides the APPENDIX of this product Always read the instructions before using the equipment ...