HQ Series Quarter-turn Electric Actuator
Installation Operation& Maintenance Manual
Doc No. : HumG-HQ-21 Rev2 Page 21 / 26 Valve Automation Leader, HKC
8.2.9. Verify that coupler/bracket is correctly installed and is not causing any binding
8.3. Actuator runs erratically
8.3.1. Check the ambient temperature
8.3.2. Verify that the duty cycle has not been exceeded
8.3.3. Check the position of manual override lever
8.4. Optional Equipment(s)
8.4.1. Potentiometer --- 16 Rev1]
① Check the resistance value
② Check potentiometer gear for jamming
③ Check ZERO and SPAN calibration, [and confirm input / output signal --- 16 Rev1]
④ Check the board for any damage
8.4.2. Current Position Transmitter
① Verify the input signal
② Check the configuration of the dip switches
③ Check the board for any damage
9. Installation and Maintenance Tips
WARNING:
When working in potentially explosive areas, be sure to comply with the standard EN 60079-14
“Electrical Installations in Hazardous Areas”.
Working on the actuator that is in open the cover and under voltage must only be performed if it is
assured that there is no danger of explosion for the duration of the work.
[Explosion proof enclosure! Before opening, ensure the absence of any flammable gas, dust and
voltage --- 16 Rev1]
[When operation, maintenance, or installation shall be verified that O-rings are not damaged or
pinched between their parts. ---- 15 Rev1]
[Dust ignition proof enclosure! It may be charged electrostatic potential. Therefore it shall be installed
in such way that the risk from electrostatic discharge and propagation brush discharge caused by
rapid flow of dust is avoided. --- 15 Rev.1]
CAUTION:
A regular inspection and maintenance should be performed by qualified and trained personnel
Treat cover with care. Gap surfaces must not be damaged or dirtied in any way. Do not jam the cover
during fitting.
Pay attention to national regulations
For any installation and maintenance work, the followings should be noted:
9.1. Check the quarter turn actuators visually. Ensure that no external damage or changes are visible. The
electrical cables must not be damaged and wired correctly.
9.2. Cable entries, cable glands, plugs, etc. have to be checked whether they are correctly tightened and
sealed.
9.3. Check that the Ex-connections are correctly fastened.
9.4. Check for the possible discoloration of the terminals and wires as this may indicate an increased
temperature.
9.5. Check the flame path gaps of [the explosion proof --- 16 Rev1] enclosures for any dirt and corrosion.
Since the dimensions of all Ex gaps are strictly defined and inspected, no mechanical work shall be
performed on them.
9.6. All cables and motor protection elements have to be checked.
9.7. During the maintenance if any defects are detected that may affect the safety, repair measures have to
be taken immediately.
9.8. Any kind of surface coating for the gap surface is not permitted.
9.9. When replacing parts, seals, etc., only original spare ones must be used.
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