KEYENCE GT-70A Series - Manual

1 GT-M-E
Multipurpose Digital Contact Sensor
GT-70A
Series Instruction Manual
Safety Precautions
■ General cautions
• At startup and during operation, be sure to monitor the function
performance of the GT-70A Series.
• Do not modify the GT-70A Series or use it in any way other than
described in the specifications. The function performance of
products used or modified in this way cannot be guaranteed.
• When the GT-70A Series is used in combination with other
instruments, function performance may be degraded, depending on
operating conditions and the surrounding environment. Use the GT-
70A Series after fully studying the effect of combined use with other
instruments.
• Do not use the GT-70A Series for the purpose of protecting the
human body.
• Do not expose the GT-70A Series and peripheral devices to sudden
temperature change. This may cause condensation, damaging the
equipment.
● Environmental conditions
To use the GT-70A Series properly and safely, do not install the GT-70A
Series in the following locations. Use of this equipment in an improper
environment may cause equipment failure.
• Locations with high humidity, a large amount of dust, or poor ventilation
• Locations where the temperature rises excessively due to direct
sunlight, etc.
• Locations near corrosive or flammable gas
• Locations where the GT-70A Series is directly subjected to
vibration or impact
• Locations where water, oil or chemicals may come into contact with
the GT-70A Series
• Locations where static electricity may easily occur
● Noise countermeasures
Installation near the noise source such as a power source and a
power cable may cause malfunction or failure of the equipment.
Adopt appropriate countermeasures against noise by using a noise
filter or wiring cables in separate ducts, attaching insulation to the
amplifier or the sensor head, etc.
● Effects of ambient temperature
Change in ambient temperature may cause detection errors. Keep
ambient temperature at a constant level.
It will take about 40 minutes for the internal temperature distribution
of the equipment to completely adjust when the ambient
temperature has changed by 10°C.
● Warming up
Wait about 30 minutes after the power is turned ON before beginning
operation. Immediately after the power is turned ON, the circuit
becomes unstable, possibly causing the indicated value to slightly
fluctuate.
● Handling of the sensor head
• The GT-70A Series and peripheral devices are precision machines.
Do not drop, or cause any other impact to these devices.
• Do not apply weight greater than what is listed below to the spindle part.
Do not apply torque in the rotation direction. Otherwise the spindle may
break.
• Although the sensor head has a waterproof structure, avoid using in
water or in the place where liquid such as water and oil may come into
contact with the sensor head.
● Extending cable between amplifier and sensor head
Do not cut or extend the cable between the amplifier and the sensor
head. This may change the characteristics, causing the
specifications not to be satisfied.
● Power supply
• Noise superimposed on the power supply may cause malfunction.
Be sure to use the DC stabilized power supply provided with an
insulation transformer.
• In the case of a commercially available switching regulator, be
sure to ground the frame ground terminal or the ground terminal.
● Effects of vibration
Vibrating the detection target may cause fluctuation in the indicated
value. In this case, extend the response time. This ensures more
accurate detection values.
● Effects of magnetic fields
Contact by an external magnetic field to the sensor head will
influence the output. Avoid installing the GT-70A Series near motors
or other equipment and devices that generate strong magnetic
fields.
● About dust protective boot
An optional dust protective boot is available (GT-H10: OP-78041, GT-
H22: OP-78042) for when the included dust protective boot has been
cracked or damaged. Please note that we cannot guarantee the
protection rating IP67 when the optional part is used. If you need a
guarantee for the protection rating IP67, replace the sensor head
itself.
WARNING
If the following conditions are encountered,
immediately turn OFF the power. Continuing to use
the GT-70A Series under these abnormal conditions
may cause equipment failure.
• When water or foreign matter enters the controller
• When the GT-70A Series is dropped or the housing
is damaged
• When the GT-70A Series produces smoke or an
abnormal smell
WARNING
• Do not use the GT-70A Series with a voltage other
than specified voltage, as this may cause fire,
electric shock or equipment failure.
• Do not disassemble or modify the GT-70A Series.
This may cause fire or electric shock.
CAUTION
• Be sure to turn OFF the power of the GT-70A Series and
any connected devices before connecting or
disconnecting the cables. Otherwise, there may be a risk
of damage.
• Do not turn OFF the power while setting parameters.
Otherwise, the settings may be partially or completely lost.
30 N 100 N 1 N
96M1825