Guralp Systems CMG-3TB - Manual (Page 23)

Operator's guide
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 breakout box, 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. Do not connect
both DC and mains power at the same time.
The hole lock control unit supplied in regions with 220 V AC
mains power differs from that supplied for 110 V AC mains
power. You should ensure that you provide the correct voltage
to the hole lock control unit, otherwise damage may result to the
sensor.
2. Open the MASS LOCK / UNLOCK – POWER ON / OFF flap on
the breakout box, and set the sensor power switch to the off
position. The hole lock will only function whilst the power is
off, to avoid injecting current transients from the mains power
supply into the sensor electronics.
3. If you are using a deep-borehole hole lock control unit, set the
dial to zero.
Engaging the hole lock
To extend the jaw of the hole lock:
1. Hold the switch on the hole lock control unit in the EXTEND
JAW or + position. If you are using a deep-borehole control
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