Pulsafeeder ELMA NEMA 4X, Инструкция по установке, эксплуатации и обслуживанию

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3
injection in response to a pH signal for neutralization jobs, where the lower range
signal requires reverse action.
2. Meter readout is for direct acting only.
3. Auto-manual includes auto-manual switch and manual potentiometer; switch is
non- shorting type.
4. Option A and 8 in position 6 require Position 3 =X (no auto signal)
5. 3-15 psi option not available on NEMA Type 7 actuators
6. Option M also includes 4-20 mA output as standard.
7. Operator station options with meter readout (Position 8, D, F or G) are only
available in NEMA Type 4X plastic enclosure (Position 7 - J or P). Meter is
located inside the enclosure behind transparent cover. Meter does not have a
NEMA rating.
2. Introduction
2.1 General Description
The PULSA stroke length controller is an electromechanical control device which
adjusts the output flow of a PULSA Series pump according to and external process
control signal. The controller design provides a compact, integral to the pump servo
amplifier configuration, which utilizes AC synchronous motor technology as the
primary driver. The stroke length is linear and proportional (directly or indirectly, as
chosen by the customer) to the input control signal. Likewise, the reference feedback
signal which is provided for remote monitoring of actual stroke length position, is also
linear and proportional. Control of stroke length can be done manually by using the
electronic override switch and a hand knob. An external mechanical indicator is
mounted directly on the controller to indicate percent of stroke length.
2.2 Standard Features
1. Input signals
a. 4-20 mA @ 250 ohm
b. 1-5 mA @1,000 ohm
c. 10-50 mA @100 ohm
d. 1-5 VDC
2. 4-20 mA feedback output signal
3. External stroke length indicator (mechanical)
4. Manual override provision (mechanical)
5. NEMA Type 4X or UL listed NEMA Type 7 enclosure design
6. Integral actuator/servo amp design
7. Signal loss detection circuitry
8. 115 V @ 60 Hz operation
9. Over signal protection