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SENSORS AND MOTORS SAFETY SWITCH Chapter Issue 1 Sep 02 Technical Reference Manual 20.15 SAFETY SWITCH Descriptio n The safety swit ch is a device fitted to the machine cover s designed to provide operator saf ety . The …

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SENSORS AND MOTORS
REED SWITCH SENSOR
20.14 Technical Reference Manual Chapter Issue 1 Sep 02
Testing/
Adjustment
Setting of the sensor is necessary in order to:
• Ensure that switching takes place in the correct position
• Ensure correct sensing, ie closing when piston extended/retracted
NOTE
For adjustment of ProFlow paste low sensor refer to ProFlow chapter of this
manual.
Figure 20-12 Voltage Diagram
Magnetic Piston Retracted Extended Retracted
12V
0V
Closed ClosedOpen
Reed Switch
Signal
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