© 2016 SPI Lasers UK Ltd.
Commercial in Confidence
SM-S00500 Revision A 21 October 2016
redPOWER QUBE Cased Fiber Laser User Manual
Two door interlock switches must be used. These are supplied from the internal 24V DC
supply and should be “volt-free” contacts. One interlock switch is connected to the positive
side of the supply and the other to the negative. This allows wiring faults to be detected,
however it means that two interlock switches are always required. A single interlock switch
cannot be used to control both inputs. Dual interlock switches are available specifically for
process cabinet safety interlocks from several manufacturers, including Allen Bradley, Pilz,
Rockwell (GuardMaster) and Schneider (Telemecanique). The 24V supply is SELV and must
be appropriately separated from non-SELV circuits. Both interlock switches should open when
the door is opened. The safety function monitors both interlock switches and if one interlock
switch opens and closes again without the other interlock switch opening, the safety circuit
detects this as a door interlock switch fault.
If process cabinet door interlock switches are not used, PL81 pin 1 should be linked to pin 2
and pin 3 should be linked to pin 4.
WARNING: Defeating interlocks could result in exposure to
hazardous levels of radiation.
It is the responsibility of the Laser Integrator to ensure that no
hazardous levels of radiation are emitted when unsafe to do so.
PL82 comprises a PSU enable input and PSUs safe and PSUs ready status outputs. The
input and outputs are isolated from the laser control circuits, but there is also access to the
internal laser 24V DC supply. The input and outputs are nominally 24V DC and should be
considered as SELV. The isolation is provided only to prevent ground loops. The input current
is nominally 10mA. The status outputs are not polarity sensitive and are rated up to 30V DC
and 100mA.
The PSUs are enabled when the PSU enable input is on.
The PSUs safe output indicates that all the pump diode power supplies are disabled and their
output voltage has discharged to a level that is too low to cause output from the pump diodes.
The PSUs ready output indicates that all the pump diode power supplies are enabled and are
at full voltage ready to operate the pump diodes.
The safe and ready outputs are normally complementary, with a small delay between them.
The E-Shutter incorporates timers that monitor the safe and ready signals. If the PSUs take an
excessive time to enable or disable, this is detected as a fault.
Typical connections to PL82 are shown in Figure 19 and Figure 20
Figure 19 shows connections to a control contact and indicator lamps using the laser 24V DC.
Figure 20 shows connections to a PLC using an external 24V DC supply.
To Next Page
Loading...