Curtiss-Wright | PG Drives Technology
SK77981-14
119 | R-net Technical Manual | Chapter 3 – Programming
14.5
INDICATOR FAULT CURRENT 15V, INDICATOR FAULT CURRENT 20V , INDICATOR FAULT
CURRENT 25V, INDICATOR FAULT CURRENT 30V & INDICATOR FAULT CURRENT 35V.
Because the current in LED clusters does not vary linearly with voltage, then in order to ensure reliable error detection of one
cluster becoming disconnected error current thresholds must be defined for the entire operating range of the battery voltage.
This is achieved with five programmable parameters – Indicator Fault Current XV – each with a programmable range of 0.00A to
1.00A in steps of 0.005A. These parameters set an error current threshold for a defined battery voltage with threshold at
interim voltages being extrapolated between the programmed values. Examples of how to set the values for each parameter
are given below.
INDICATOR FAULT CURRENT EXAMPLES
Determine the current taken by the front LED cluster at supply voltages of 15V, 20V, 25V, 30V and 35V,
Now repeat for the rear LED cluster.
This second step is not necessary if front and rear clusters are of the same type.
Establishing the
current levels can be achieved
by; reading the LED’s data
sheet, the PC programmer
status ISM window or by
measurement using a variable
voltage power suppl y.
If the front and rear LED
clusters are different, then the error current threshold should be set to:
Higher LED c (Lower LED current / 2)
If the front and rear LED clusters are of the same model, then the error current threshold should be set to:
LED c (LED current / 2)
Example 1:
The front and rear LED clusters are of different types and have voltage/current relationships as shown in the table below. Th e
values of Indicator XV Fault Current are calculated using:
Higher LED c (Lower LED current / 2)
Parameter
Programmable Range
Indicator Fault Current 15V
0 to 1A steps 0.005A
Indicator Fault Current 20V
0 to 1A steps 0.005A
Indicator Fault Current 25V
0 to 1A steps 0.005A
Indicator Fault Current 30V
0 to 1A steps 0.005A
Indicator Fault Current 35V
0 to 1A steps 0.005A
