CP3 version 3003
59
System Calculation
Before any installation, it is important to make sure that the system with cables, sensors, LED indicators etc.
are correctly mounted according to load and voltage drop. We will discuss some basic rules to adhere to
this so that the outcome will be the best-designed installation in all circumstances.
Rules of Thumb
-
Maximum 90 carpark sensors connected to a CMCG
-
Maximum 50 sensors in a Line
-
Use always unshielded 3*1.5 mm
2
cables (stranded or solid) for the sensors and LED indicators
-
Use maximum 3 m between each sensor / LED indicator. (If the sensor is lowered from rail or
ceiling, it is recommended to make the connection in the ceiling box and only pull one 3-wire to the
sensor/LED indicator, instead of pulling the cable down and then up again. See drawing below.
-
Maximum 60 m cable from the cabinet to the first sensor in line when cable type3*1.5 mm
2
is
used.
Note: It is recommended to make the connection in the ceiling box instead of pulling the wire from the
ceiling to the sensor and back to ceiling again. This is to avoid a long cable distance.
Example:
If the lowered pipe from ceiling to the sensor is 0.5 m, the cable between the sensors will be increased by
2*0.5 = 1.0 m.
Using the table below, we can see the result by increasing from 2.5 to 3.5 m using 50 sensors in a line.
Changing the distance between the sensors is not a big problem as shown in
Table 1
below. However,
changing the number of sensors is more significant. If there are 2.5 m between each sensor, the table
shows a decrease from 130 m to 81 m going from 40 to 50 sensors. That is a reduced cable length of 60%.