gefran BDI50 Series - Page 112

4-65
When the signal rises above the warning detection limit set in parameter 08-15 and for
the delay time set in parameter 08-12, the display will show ”OH4”( motor over heat
detection), then the output frequency will decelerate or coast to stop depending on the
setting of parameter 08-10.
2) If 08-10 = 3 Continue running when warning level is reached.(08-15).
Coast to stop when protection level is reached.(08-13).
When over temperature is detected by signal at terminal AVI increasing above the
Warning detection limit set in parameter 08-15, then the display will show “OH3”(motor
over heat warning level) and the motor will continue to run.
If temperature detected increases above the set limit in parameter 08-13 and for the
delay time set in parameter 08-12 then the display will show “OH4” (motor over heat
detection), and the motor will coast to stop.
3) Motor over heat detection “OH4” can be reset when the temperature detection level at
terminal AVI becomes lower then the set level in parameter【08-14 PTC reset level】.
4) External PTC thermistor characteristics
Diagram in figure (a) shows two curves for Class F and Class H temperatures.
Tr = 150°C in class F，
Tr = 180°C in class H.
Tr - 5℃：R
PTC≦ 550Ω, put value of RPTC into formula to calculate the value of V to be
set in parameter【08-14 PTC reset level】。
Tr＋ 5℃：R
PTC≧1330Ω, put value of RPTC into formula to calculate, the value of V to be
set in parameter【08-13 PTC protection level】。
5) For different specifications of PTC thermistor, set the values for parameters 08-13 and
08-14 by calculating from the formula shown below.
08- 16
Fan Control Temperature Level
Range
【10.0~50.0】°C
 When 08-07=
【
0
】
( Heat sink temperature dection control for cooling fan). Fan will run when
temperature of heatsink is higher than 08-16;
When temperature of heatsink decrease below ”(setting value of 08-16)
- 20
°
C”, fan will stop.
( )RinRR
RinR
V
PTC
PTC
//
//
10
2
1
+
××=
1330
550
Resistance
(ohms)
Temperature
Class F
150°C
Class H
180°C
Tr'
Tr - 5
Tr
Tr + 5
Tr：Temperature threshold value
(a) PTC Thermistor Characteristics
(b) PTC Thermistor
Connections
R
(1~2k ohm)
R
PTC
＋10V
AVI
GND
Internal
circuit
Rin
**
Size 1 & Size 2 : Rin=164k ohm
Size 3 & Size 4 : Rin=204k ohm