AMETEK 952 BlueOx LDT - Manual (Page 11)

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Figure 3-2: Current Sourcing
NOTE: 952A-C is current
sourcing, which allows the
current to flow from the LDT
into the user’s equipment.
Differential Input
Power +
Supply
_
952A
LDT
+ Input
- Input
Customer Supplied Power
Power Supply Common
Position Output
Position Common
Program Input
Single Ended Input
Power +
Supply
_
952A
LDT
+ Input
Common
Customer Supplied Power
Power Supply Common
Position Output
Program Input
3.5: 952A (Analog)
3.6: 952 CP (Control Pulse)
The control pulse signal interface of the BlueOx
digital output series is a differential RS-422 output.
The maximum cable length for the differential digital
LDTs is 1,500 feet. To initiate a start pulse, an
external device is used. This start pulse should be
1.0 microsecond in duration. After the start pulse
1 MICROSECOND (RECOMMENDED)
0.2 MICROSECONDS (MINIMUM)
+ INPUT (START PULSE)
TIME BETWEEN PULSES IS PROPORTIONAL TO
DISTANCE BETWEEN MAGNET AND HEX HEAD
+ OUTPUT (STOP PULSE)
Figure 3-3: 952CP Control Pulse
is received, the LDT will generate a stop pulse of
1.0 microsecond in duration. The time between
the leading edge of the start pulse to the leading
edge of the stop pulse is the proportional distance
between the magnet to the hex head. The order of
these two pulses is illustrated in Figure 3-3. To wire
the 952CP, see Figure 3-7. For proper grounding
information, see the beginning of this chapter.