AMETEK 952 BlueOx LDT - Manual (Page 27)

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5. Turn the power supply off.
6. Check the continuity of the individual wires
of the cable between the power supply and the
LDT. Check for continuity from one end of the
cable to the other. Also, verify that no shorts
exist between pins.
7. Reconnect the mating connector to the LDT.
A.3: Troubleshooting for 952 CP,
RS or VP LDTs
Troubleshooting describes common problems
that may occur when installing the LDT and offers
possible solutions to these problems. If, after
reading this section, there is still an unresolved
problem, contact factory. Troubleshooting is divided
into the following two groups:
• General Checks
• Power Supply
General Checks
Make sure that the magnet is located within
the LDT’s active stroke area. Captive magnet
assemblies should be positioned so that they can
move freely over the entire area of the active stroke
without binding or pushing on the rod end. Non-
captive magnet assemblies should be situated so
that the magnet is no farther than 0.2" from the rod
at any point in the magnet assembly’s movement.
NOTE: Ferromagnetic material (material readily
magnetized) should be located no closer than 0.25”
from the magnet or LDT rod end. This includes
mounting brackets, magnet spacers, magnet
brackets, and mounting screws. Ferromagnetic
material can distort the magnetic field, causing
adverse operation or failure of the LDT.
Check all LDT wires for continuity and/or shorts. It
is preferable that the cable between the LDT and
the interface device be one continuous run. If a
junction box is being used, it is highly recommended
that the splice junction box be free of AC and/or
DC transient-producing lines. The shield should
be carried through the splice and terminated at the
interface device end.
Unipolar Power Supply Check
This section will help determine if the power supply
is adequate for the LDT to operate properly, or if the
LDT’s cable has a short or open.
In order for the BlueOx to operate properly, the
external power supply must provide a level between
+15 to +26 VDC. A power supply providing voltage
above this specified range may damage the LDT. A
power supply providing power below this specified
range will not be sufficient to power the LDT. When
powering more than one BlueOx on a single power
supply, remember that each BlueOx requires three
(3) watts of power. The amount of current draw will
vary based on the input voltage used. To calculate
the current draw for a particular LDT, divide the LDT
wattage by the input voltage. For example, 3 watts
divided by 24 VDC equals 125mA.
If the LDT is not operating properly, the LDT’s cable
may have an open or short, or the power supply is
not supplying sufficient power. To verify this, perform
the following steps:
1. Turn the power supply off.
2. Remove the mating connector from the LDT.
3. Turn the power supply on.
4. Using a digital voltmeter, check pins B (GND)
and C (+) from the mating end of the cable for a
level between +15 and +26 VDC.
NOTE: LDTs with potted cable assemblies should
be checked for proper voltage at the power supply
terminals. This cable assembly cannot be removed
from the LDT.
If reading is between +15 and +26 VDC, turn power
supply off and go to step 7. If reading is below
+15 VDC, either the power supply is not providing
enough power or the LDT’s cable possibly has
a short/open. Readings of no voltage or minimal
voltage (less than 5 volts) may be due to a short/
open in the cable. If reading is not between +15
and +26 VDC, go to step 5. If reading is above +26
VDC, adjust power supply or replace.