THORLABS S4FC Series, Руководство пользователя

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S4FC Series Fiber Coupled Laser Source Chapter 6: Connecting the Safety Interlock
October 24, 2017, Rev R Page 15
Chapter 6 Connecting the Safety Interlock
The S4FC series laser source is equipped with a remote interlock connector located on the rear panel, see Figure
1, page 6. All units have this feature regardless of their FDA and IEC classifications. In order to enable the laser
source, a short circuit must be applied across the terminals of the Remote Interlock connector. In practice this
connection is made available to allow the user to connect a remote actuated switch to the connector (i.e. an open
door indicator). The switch (which must be normally open) has to be closed in order for the unit to be enabled.
Once the switch is in an open state the laser source will automatically shut down. If the switch returns to a closed
condition the laser source must be re-enabled at the unit by pressing the ENABLE switch.
All units shipped from Thorlabs are configured with a shorting device installed in the Interlock connector. If you
are not going to use this feature then you can leave the shorting device installed and the unit will operate normally
as described in the procedures above.
If you wish to make use of the Interlock feature you will need to acquire the appropriate connector mate and wire
it your remote interlock switch. Next, remove the shorting device by pulling it out with a pair of needle nose pliers
and install the connector into the interlock input. To use the interlock feature, a Normally Open (N.O.) switch
needs to be used. Closing the switch, closes the circuit, which enables the laser.
The interlock input only accepts a 2.5 mm mono phono jack. This connector is readily available at most
electronics stores.
The electrical specifications for the interlock input are shown in the following table.
Specification Value
Type of Mating Connector 2.5 mm Mono Phono Jack
Open Circuit Voltage
Internal Pull Up to 5 VDC
Short Circuit Current 10.0 mA DC
Interlock Switch Requirements
Must be N.O. Dry Contacts
Under no circumstances should any external
voltages be applied to the Interlock input
Figure 7 Remote Interlock Connector