5
Functional Overview (continued)
LED Colors
Green:
Magnet is present and within the active programmed range.
Red:
Fault; The LDT has lost its signal from the magnet or the magnet has moved into the Null or Dead Band.
Yellow:
The magnet is out of the programmed ZERO to SPAN range, but still within the active stroke area.
Wiring Diagrams
Q21 Wiring Connections
Once the LDT has been installed, wiring connections can be made. There are
two groups of connections you will need to make. They are as follows:
• Power Supply Connections (including ground and shield)
• LDT Input/Output Connections
Power Supply/Ground Connections
The Q21 standard cable is a 4 Pin, 12mm, eurofast® cordset. It has 4
conductors of 22AWG, with an aluminum/ polyester foil shield with drain
wire. Cable O.D. is .21” (5.3mm). To reduce electrical noise, the shield must be properly used. Connect the cable’s shield to the
controller system GND.
NOTE:
Do Not Use Cordsets with LED’s
Always observe proper grounding techniques such as single point grounding and isolating high voltage (i.e. 120/240 VAC)
from low voltage (10-30 VDC cables). Whenever possible, this cable should be run in conduit by itself. The power supply
common, the cable shield and a good earth ground should be connected together at the location of the power supply
common.
WARNING:
Do not route the Q21 output cable near high voltage sources.
In order for the Q21 to operate properly, the LDT’s external power supply must provide a voltage b10 to +30
VDC. The power supply must be rated at 100mA minimum. The power supply should provide less than 1% ripple and 10%
regulations. (The power supply should be dedicated to the LDT to prevent noise from external loads from affecting the Q21.)
Single Ended Input
NOTE:
Q21-LI is current sourcing, which allows the current to flow from the LDT into the user’s equipment.
Power
Supply
Q21
LDT
Customer Supplied Power (Brown)
Position Output (Black)
Customer Supplied
Interface Device
Program Input
(White)
(Blue)
+
+
-
Input
Common
Power Supply Common
2
3
4
1
Wiring Diagram
