97
Selection and protection of a motor
(5) PTC thermistor protection (Pr. 561)
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 or 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 unavailable when using terminal 2 for PID control and Dancer control. When PID control and Dancer 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
Summary of Contents for FR-D700 Series
Page 11: ...VII MEMO ...
Page 23: ...12 MEMO ...
Page 57: ...46 MEMO ...
Page 262: ...258 MEMO ...
Page 276: ...272 MEMO ...
Page 287: ...283 MEMO ...
Page 289: ......