Operating Instructions for ERU Knife Gate Valve K1 with electric actuator
4.3 Jogging Operation and Manual Emergency Operation
Note: before start-up spindle and spindle nut are to be greased. (recommended
lubricant see section “Maintenance”)
A t t e n t i o n :
If a foreign body is jammed in when operating the valve, the torque switch for the
corresponding direction responds and switches off the motor.
The time lag between response of the torque switch and disconnection of the motor
from the network depends on the signal delay. If another closing order is given in the
original direction, without having moved the valve sufficiently in the opposite direction,
the torque will increase. If this procedure is repeated several times, the torque will
accumulate. The valve and its operating elements are not designed for such an
emergency and might be damaged.
+
We explicitly draw your attention to the fact that such "jogging operation" is
inadmissible.
Jogging operating is admissible under the following conditions:
If the torque switch responds in intermediate position, the valve must first be moved in
the opposite direction until the torque switch completley returns to its original position.
Only now the valve may be moved again in the direction in which the disturbance
occurred. Proceeding this way, you will obtain torques corresponding to the torques
set at the torque switch. Moreover, the foreign matter can come off and be flushed out
of the seating zone.
Operation by emergency handwheel:
If the valve is operated by means of the handwheel of the electric actuator, the torque
switches do not provide any safety function.
If a foreign body is jammed with the valve being in intermedite position,
excessive operating force - particularly in case of high gear reduction - might be
damaging to the drive components. Therefore, we draw your attention to the
following fact:
If any resistance is detected during emergency handwheel operation, some turns
must be made in the opposite direction before the handwheel is turned again in the
direction in which the disturbance occurred (flush out the foreign body).
Continue operation with utmost care, in no case using excessive force. If need be,
repeat flushing operation.
BA46E033
July 2005
Rev. 4
ERHARD-Armaturen
x
D-89502 Heidenheim
x
Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info
@
erhard.de
Internet: http://www.erhard.de
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