Operator's guide
2.5 Operating the hole lock
The hole lock, if fied, can be extended and retracted using the hole
lock control unit:
Caution:
The hole lock may be using high-voltage mains (outlet) power.
1. Connect the hole lock control unit to the
HOLELOCK POWER
connector of the surface control unit, and to a mains power
supply. Alternatively, connect a 12 – 24 V DC power supply
across the input terminals of the hole lock control unit.
The hole lock control unit supplied in regions with 220 V AC
mains power difers f rom t hat s upplied f or 1 10 V A C m ains
power. You should ensure that you provide the correct voltage to
the hole lock control unit, otherwise damage may result to the
sensor.
2. If you are supplying power to the sensor through another
connector, ensure that it is switched of whilst you operate the
hole lock.
3. If you are using a deep-borehole hole lock control unit, set the
dial to zero.
December 2004
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