SkyWave IDP 800 Series, Руководство по оборудованию, Страница: 40 / 102

IDP 800 Terminal Series - Hardware Guide
T209, Version 01 28 © SkyWave Proprietary

Top-off current is the third charging stage. It is active for one hour.
Table 21 lists the specifications for the three charging stages.
Table 21 Charging Stage Specifications
Parameter Condition Min Typ Max Units
First Stage: Pre-charge Current
Pre-charge
current Pre-charge when battery voltage
< 12 V - 170 - mA
Pre-Charge
Temperature
Range As measured in the battery
compartment -10 - 50
15
°C
Pre Charge
Maximum
Duration Normally the charge goes to fast-
charge when the battery voltage
>12V.
However, the charger remains in
pre-charge to charge the battery if
the temperature is < 0°C. - - 16 hour
Second Stage: Fast-charge
Fast-charge
Current Fast-charge current is a constant
charge battery voltage - 660 - mA
Maximum time
for fast-charge Assuming dV/dT and temperature
is in range - 4 - hours
Maximum
-dV/dT threshold
to terminate fast-
charge Assuming temperature is in range
and timer not expired - - 59 mV
Fast-charge
temperature
range As measured in battery
compartment 0 - 50
15
°C
Third Stage: Top-off
Top-off charge
current Temperature must be in range. - 85 - mA
Top-off
maximum
duration Temperature must be in range. 1 hour
3.9 Accelerometer
The IDP-800 has an internal 3D accelerometer to detect motion in any axis. Figure 15
shows the positive axes for the accelerometer.
15
As the battery compartment temperature is to measure temperature, the maximum temperature is
reduced from the safety recommendation provided by the battery manufacturer.