User's Manual

Page 8
3. MAINTENANCE AND REPAIRS
U
nder normal circumstances, no maintenance should be required.
3.1 Cleaning
3.1.1 If clean, dry air is not used the orifice can become blocked. To clear, first turn off supply air, then remove the
screw located under the zero adjustment. The orifice is located between the two black o-rings. You may need a
magnifying glass to see it. Unplug the orifice by running a wire that has a smaller diameter than 0.012” (0.30mm)
t
hrough it.
3.1.2 Used compressed air to blow out any loose particles inside the orifice screw assembly.
3.2 Precautions
3.2.1 The bonnet should be removed only if a different operation mode is desired which requires a change in circuit
board switch settings. In this case, precautions are necessary.
3.2.2 Never handle circuit board unless properly grounded to prevent ESD (Electro-static Discharge).
3.2.3 If ESD grounding equipment is not available, hold the IP710 by its castings and adjust switches using a non-con-
ductive devise such as a pencil or a small rubber handled screwdriver.
3.2.4 Never remove circuit board for any reason. This will shift other components and possibly damage the pressure
sensor, both cases resulting in malfunction.
3.2.5 Use caution when replacing bonnet. If any resistance is felt, remove bonnet and determine the interference.
Typically it will be the strain relief grommet on the wires. The grommet should be oriented so it sits beside the
switches.
3.2.6 Clean, dry air should be used with the IP710. Foreign matter in the supply line can clog the orifice openings.
(.013” for a 3-15 psig unit, smaller for higher range units.) Foreign matter can also collect on the actuator causing
erratic operation. Moisture in the supply line can damage circuit board components.
3.2.7 The electrical specifications as outlined in the IP710 instructions must be complied with. If more than one IP710
mA unit is driven by the same PLC, there must be a minimum of 9.5 v DC available to each unit. For a IP710 volt-
age unit, there must be a constant supply voltage of 7-30 v DC applied to the red wire. The variable control volt-
age is applied to the orange wire.
3.2.8 If difficulty is experienced during calibration or if turning the zero or span screw has no effect on the unit, a reset-
ting technique can be taken. Turn both the zero and span screw a minimum of 30 revolutions in one direction.
Then turn both screws exactly 15 revolutions in the opposite direction. This procedure will put the potentiometers
at their midpoint of effective adjustability. Next, calibrate to desired settings starting with the zero screw.
3.2.9 Reverse Acting Mode: For reverse acting units, the zero adjustment refers to the minimum electrical signal and
maximum output pressure. The span refers to the maximum signal and the minimum output pressure. For calibra-
tion in reverse mode the resetting technique can be taken if necessary and calibration should always begin with
the zero screw.
4. TROUBLESHOOTING
PROBLEM CHECK SOLUTION
Sluggish performance Blocked orifice Clean orifice (3.1)
or r
educed range Supply pressure Increase supply pressure (see specs)
Leakage Connections Check seal at port
Low or impr
oper span Supply pr
essure
Increase supply pressure (see specs)
Connections Check seal at port
Erratic operation Moisture in air supply Use clean, dry air (see specs)
Loose wires or connections Check wiring (1.5)
Dip switch settings Reset dip switches (2.2/2.3/2.4)
5. WARNING
F
AILURE MODES:
This device must not be used for pr
otecting final contr
ol elements connected to the output por
t fr
om the ef
fect of
pr
essur
e pr
esent at the supply por
t. If devices connected to the output port have a pressure rating less than the pressure present at
the supply por
t, then pressure relieving or pressure limiting devices must be employed to protect the devices from over pressuriza-
tion, possibly causing physical damage, personal injury and/or property damage.
NOTE