LC640.480.21-065 Operations Manual (OM610-00)
26
Table 20. Backlight Heater Parameters.
Parameter
Value
Type
Resistive wire (nichrome: NiCrA – 80% Ni 20% Cr, 39 AWG,
53 ohms/foot)
Length/Lamp
~ 200 mm (7.87 inches)/lamp, 8 revolutions around each lamp,
resistance/wire = 36 ohms, total heater resistance = 6 ohms
Active temperature sensor
Monitor temperature sensor with the highest reading
Control
Duty cycle and maximum power time delay are stepped as shown
in Figures 15 and 16
Inverter enable
Inverter is enabled as shown in Figure 15.
If the temperature is below +10°C, inverter is turned off until the
lamps are heated.
Status indicator
Set the status indicator when the inverter is disabled. See “Heater
Operation and Over Heat Status Lines.” On page 25.
Hysteresis
3.0 °C
Heater voltage
8-18 Vdc
Power
10.6 W (@ 8 V), 54W (@18 V)
Figure 15. Sensor Temperature vs. Lamp Heater (Inverter Startup Time Delay)
SENSOR TEMPATURE VS
LAMP HEATER(@ FULL POWER) & INVERTER STARTUP TIME DELAY
-10
-5
0
5
10
15
20
25
30
35
-50
-40
-30
-20
-10
0
10
20
30
40
50
SENSOR TEMPERATURE (C)
L
A
MP
HT
R/
IN
VT
R
S
T
ART
UP
DEL
A
Y
(SEC)
Содержание LC640.480.21-065
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