Kval Acro-HD, Руководство по эксплуатации и обслуживанию, Страница: 50 / 64

About Sensors
4-2
KVAL Acro-HD Operation/Service Manual
About Sensors
On the Acro-HD, sensors provide input to the PLC. The application in the machine is similar to a
micro-switch. There are 5 proximity sensors on the Acro-HD.
Note:
For location of the sensors on the machine,
Figure 2- 1 on page 2.
If issues point to the sensors, use a DVM (Digital Volt Meter) at the PLC to check the voltages in
the “On” and “Off” states. See the machine drawing for detailed wiring connections.
The Proximity Sensor detects metallic objects without touching them.
• An inductive proximity sensor consists of a coil and ferrite core arrangement, an
oscillator and detector circuit, and a solid-state output. The ferrite core and oscillator
create a field generating out the front of the sensor. When a metal object enters the
field, a loss in amplitude occurs. The detector circuit recognizes the loss of ampli-
tude and generates 0VDC to send to the PLC. When the metal object leaves the sens-
ing area, the sensor to returns to 24VDC and sends it to the PLC.
• As a result, if a metal object is sensed, the output of the sensor equals 0VDC.
See Figure 1 below, for some examples of Sensors:
FIGURE 1.
TABLE 4-1.
Sensor Descriptions
Sensor Designator Description
I-0004 Down Reset Position: indicates Pivot is at rest
I-0005 Down Pos. Fixed End Safety Slot- protects hands from getting caught in machine
I-0006 Movable Safety Slot-protects hands from getting caught in machine
I-0007 Mid Level Ferrous fixed end--detects mid level of Pivot
I-0010 Mid Level Ferrous movable end --detects mid level of Pivot
Proximity Detector
Senses metallic
objects