IPG YLR Series, User Manual

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YLR-SERIES USER GUIDE
IPG PHOTONICS | USING YOUR DEVICE 29
Interlock Description
YLR lasers incorporate an interlock safety circuit that utilizes a dual channel system with monitored output
and manual reset. Upon opening the interlock, the safety circuit will open and power to the laser diodes will
be removed.
To have the possibility of the main power supply activation, it is necessary to close dual channel interlock
(on 24-pin connector: pin1 is connected with pin4 and pin2 is connected with pin3). Otherwise, the internal
main power supply is switched off and the emission cannot be turned on. Once any of the pairs of the
mentioned above contacts has been opened it is impossible to switch the lasers power supply on until the
second pair is opened and then both pairs are closed.
If the interlock is closed (E-stop button is also released), and a fault has not been detected, pressing the
START pushbutton will enable the main power supply and the Power Supply (PS) Active signal will go to a
high state. The power to the laser diodes will also turn on. However, under normal conditions the diodes
themselves will only turn on after emission is enabled.
When the interlock is opened or a fault is detected, the laser diodes will be disconnected from the main
power supply and Power Supply Active signal will go to a low state. A detected fault will be latched and
onboard relays will open the monitored manual reset loop, thus preventing the laser from being restarted
until the fault is addressed. If a fault is detected, such as a shorted interlock channel, or a shorted START
pushbutton, the safety circuit will not reset until the fault is corrected.
In the case of a shorted remote START pushbutton (this is the equivalent of holding the START
pushbutton in), the circuit will not reset when the interlocks are closed until the safety circuit sees both
channels open and then closed with the START pushbutton in the opened state or the power to the safety
circuit has been cycled with the START pushbutton in the opened state.
Table 4 provides electrical pin assignments for these interlock channels.
Interlock safety circuit is designed for emergency shutdown according to ISO 13849-1 Cat 3 PL d with B
10d
of 10
7
and absolute maxim frequency of safety interlock operations 50 cycles/min based on specifications
for electro-mechanical components used in the circuit.
External Interfaces
The interface is provided using an 8-pin and 24-pin interface connectors (Figure 6: Rear Panel Layout
items two and three). Refer to
the “Computer Interface / Commands” section for setting up these
interfaces.
Interface Wire Specification
The minimum wire gage is 18AWG at 15 meters (30 meters maximum regardless of gauge). The gage of
the wire must increase as the distance increases. For connectivity, the wiring and/or cabling must have an
overall shield to ensure proper functionality. The shield is to cover over all conductors and terminate at the
unit where the conductors enter/exit the unit.