Vista Sensors and Motors.pdf - 第16页

SENSORS AND MOTORS SAFETY SWITCH 20.16 Technical Reference Manual Chapter Issue 1 Sep 02 T esting/ Adjustment T o adjust the safety swit ch, physicall y move the body of the switch to ensure that 6mm of cover movement ac…

100%1 / 30
SENSORS AND MOTORS
SAFETY SWITCH
Chapter Issue 1 Sep 02 Technical Reference Manual 20.15
SAFETY SWITCH
Description The safety switch is a device fitted to the machine covers designed to provide
operator safety.
The design of the internal anti-tamper cams also act as a latch. A 6mm
movement of the switch activator ’open circuits’ the safety contacts. There are
3 sets of contacts in the switch but only 2 of the sets, both normally open (NO),
are used by the machine. One set of contacts is used as a digital input to inform
the PC that a cover has been opened, the other set is used as part of the system
safety loop to cut the system power.
One signal provides the input for both the front and rear. The cover interlock
signal is pulled low when either the front or rear cover is opened.
Figure 20-13 Safety Switch Schematic
Safety Switch
MultiMove X13
Digital Input
V+ (User)
Opto-isolator
2K
0V (User)
12V
0V
21
11
12
22
Part of
System
Safety
Loop
1112
21
33
34
22
SENSORS AND MOTORS
SAFETY SWITCH
20.16 Technical Reference Manual Chapter Issue 1 Sep 02
Testing/
Adjustment
To adjust the safety switch, physically move the body of the switch to ensure
that 6mm of cover movement activates the switch.
Figure 20-14 Voltage Diagram
Cover Closed Open Closed
12V
0V
Closed
Circuit
Closed
Circuit
Open
Circuit
Continuity
Signal
SENSORS AND MOTORS
MICROSWITCH SENSOR
Chapter Issue 1 Sep 02 Technical Reference Manual 20.17
MICROSWITCH SENSOR
Description The microswitch sensor used in this application is a solid state microswitch with
no mechanical contacts. The plunger operates a Hall effect sensor triggering
the transistorized output.
Figure 20-15 Microswitch Sensor and Schematic
Testing/
Adjustment
Testing can be carried out with the microswitch in circuit by measuring the
voltage between pin O and pin
- (0V), Voltage Diagram Figure below, refers.
Figure 20-16 Voltage Diagram
Stepper Multiplexer Digital Input
V+ (User)
Opto-isolator
2K
0V
Squeegee/ProFlow Home Microswitch
o
+
-
s
Voltage
Regulator
Trigger
Circuit
and
Amplifier
Hall Effect
Sensor
Block Diagram of Microswitch
+
o
_
Switch Position
Released Depressed Released
12V
0V
Voltage
Output at O