9
(open-to-position dry output contact), and the current end of valve position “O+” and
“O-” output at the same time have a current output of 20mA (with current output and
modulating type is applicable).
Turn the switch knob clockwise, the actuator will run to the closing direction, and
the “valve on/valve off” indicator flashes green light. The electric actuator is turned
off until it stops at the fully close position, the "valve on/valve off" indicator is green,
and the "dry contact common end" and "close to position" have a closed dry contact
output (close to position dry output contact). The current end of valve position “O+”
and “O-”output at the same time have 4mA current output (with current output and
modulating type is applicable). When the electric actuator is in local working state,
the electric actuator is in on or off running state, release the switch knob and the
electric device will stop at this instant position.
While the actuator is operating, maybe due to a jammed valve or some other
reasons, over-torque is happened and then, the actuator will be protected and stop
working. There is dry contact closure (passive output torque contact) between “dry
contact common port” and “over-torque”. “Power/Malfunction” button’s indicator is
red; at the same time, a corresponding indicator should flash (flashing frequency is
lower than that of when the actuator’s operating). Supervisory relay is set in the
integral type of actuator. The supervisory relay would be excited when actuator is
normally working. The supervisory relay would be de-energized(non-excited state)
when some thing just happened and influenced actuator( change button is turned to
“stop” or, when power is off, loss of phase, motor has over-current or over-heated).
7.2.5 Control and adjustment for remote switch valve
Turn the change over button to “Remote” and then “Local/Remote” button’s
indicator is green; the actuator is remotely controlled. There is a dry contact closure
(dry contact in remote control) between “Dry contact common port” and “Remote”.
Select a proper wiring method from the attachment according to the remote control
electric schematic diagram. A corresponding indicator is flashing when actuator is
working.
7.2.6 Control and adjustment for analog signal input (applied for the adjustment type
of actuator)
Connect the ampere meter with the port of current of valve position “O+” and
“O-”in order to supervise valve’s position output. Short-circuit the remote analog
control (eg. Electric schematic diagram zq3e, No.5) and control common port (eg.
Electric schematic diagram zq3e, No.6) and then, connect the analog control signal,
which is from remote control system, (4-20mA) with input current port of the actuator
“I+” and “I-”. Adjust the input control current from 4mA to 20mA. The actuator starts
from the input tracking signal of closure position and stops at the fully open position.
Meanwhile, the valve position signal changes with 4
～
20mA. On the contrary, when
the input control signal changes from 20
～
4mA, the actuator starts from input
tracking signal of open position to the fully closed position, with the output valve
position signal changing from 20mA to 4mA. Under the control of analog signal is
broken, there are three conditions: 1. Stay-put. 2. Stopped at the fully open position. 3.
Stopped at fully closed position. Factory default is stay-put, No.2 and 3 can be
Содержание XZA Series
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