Utility Requirements and System Installation
3 - 11
The following requirement minimizes the voltage loss from supply
to the DIAMOND C-20 and C-30:
Control Signal
Connection
Electrical control of the DIAMOND C-20 and C-30 lasers is
achieved via an RJ-45 connector built into the system. The signals
carried on each of the pins are indicated in Table 4-1 on page 4-1.
Details about controlling the laser through the signal interface are
discussed in Section Four: Laser Operation.
NOTICE!
Coherent highly recommends use of shielded interface cables.
The interface cable shield must connect to the chassis ground of
the controller. In addition to proper shielding, this shield
provides a secondary connection for the signal ground (Pin 8).
A floating ground connection (use of un-shielded interface cable
or no return path between the host control electronics and the
laser) can present an unsafe condition and result in unstable or
unexpected operation of the laser. This condition can arise when
the control signal ground connection (Pin 8) is lost and the
Control Enable (Pin 7) and RF Enable (Pin 1) remain high.
Therefore, Coherent strongly recommends that a second safety
ground be provided either via a shielded control cable or
common potential chassis mounting between the laser head and
the control electronics. Inadequate or nonexistent grounding
between the laser and the external control system can result in
loss of control of the laser and damage to the laser electronics or
the external control electronics.
WIRE LENGTH (IN METERS) AW G
0-2 18
2-3 16
3-5 14
5-8 12
8-12 10
12-20 8
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