PAGE
72
of
131
umbilical breakout
(Fig. 156-1)
.
►
The motorized left and right modules connect to any of the 8-pin Lemo
®
receptacles on the crawler umbilical breakout
(Fig. 155)
.
►
The module connected to the
Y-ENC
8-pin Lemo
®
will transmit
encoder signals through the
umbilical as the 2
nd
encoder
axis. Typically, the raster arm is
connected to the
Y-ENC
receptacle.
►
The module that is connected to
the
X-ENC
8-pin Lemo
®
transmits
encoder signals through the
umbilical as the 1
st
encoder axis.
Typically, the right drive module is connected to the
X-ENC
receptacle.
►
The unlabeled 8-pin Lemo
®
does not support encoder signals.
Typically, the left
drive module is connected to the unlabeled receptacle.
►
In the event of an auxiliary encoder failure with the right drive module, the right
and left drive modules connectors may be swapped. This transmits encoder
signals from the left drive module through the umbilical.
The umbilical contains a built-in circuit which buffers encoder signals in addition
to providing isolation and protection to user instrumentation.
The isolator requires
5VDC from the user’s instrument and this is built into the supplied encoder cables.
NOTE:
Troubleshooting by way of simple continuity checks through the umbilical are not
effective due to the isolation circuit.
Static, spike and signal conditioning are built into the umbilical for the network
signals.
Power fuses are provided within the crawler umbilical breakout for the
power distribution to the various receptacles.
When troubleshooting, if a module is
not functioning properly when plugged into a receptacle, it may be plugged into any
other matching receptacle.
NOTE:
Before use, inspect the cable and connectors for damage.
When any damage is
evident, the cable must
NOT
be used.
Using a damaged cable may be a safety
hazard and could also put other system components at risk.
Fig. 159
-
Controller cable connected
CAUTION!
Do not disconnect under load.
Shut off power before connection or disconnecting.
Permanent damage to electronics could occur.