Instruction Manual Series 70CV2000 Chloromatic TM Valve used with Series & FX4400 Gas Dispensing Systems

Transcription

1 Instruction Manual Series 70CV2000 Chloromatic TM Valve used with Series & FX4400 Gas Dispensing Systems

2 These instructions describe the installation, operation and maintenance of the subject equipment. Failure to strictly follow these instructions can lead to an equipment rupture that may cause signifi cant property damage, severe personal injury and even death. If you do not understand these instructions, please call De Nora Water Technologies for clarifi cation before commencing any work at and ask for a Field Service Manager. De Nora Water Technologies, Inc. reserves the rights to make engineering refinements that may not be described herein. It is the responsibility of the installer to contact De Nora Water Technologies, Inc. for information that cannot be answered specifically by these instructions. Any customer request to alter or reduce the design safeguards incorporated into De Nora Water Technologies equipment is conditioned on the customer absolving De Nora Water Technologies from any consequences of such a decision. De Nora Water Technologies has developed the recommended installation, operating and maintenance procedures with careful attention to safety. In addition to instruction/operating manuals, all instructions given on labels or attached tags should be followed. Regardless of these efforts, it is not possible to eliminate all hazards from the equipment or foresee every possible hazard that may occur. It is the responsibility of the installer to ensure that the recommended installation instructions are followed. It is the responsibility of the user to ensure that the recommended operating and maintenance instructions are followed. De Nora Water Technologies, Inc. cannot be responsible deviations from the recommended instructions that may result in a hazardous or unsafe condition. De Nora Water Technologies, Inc. cannot be responsible for the overall system design of which our equipment may be an integral part of or any unauthorized modifi cations to the equipment made by any party other that De Nora Water Technologies, Inc. De Nora Water Technologies, Inc. takes all reasonable precautions in packaging the equipment to prevent shipping damage. Carefully inspect each item and report damages immediately to the shipping agent involved for equipment shipped F.O.B. Colmar or to De Nora Water Technologies for equipment shipped F.O.B Jobsite. Do not install damaged equipment. De Nora Water Technologies, COLMAR OPERATIONS COLMAR, PENNSYLVANIA, USA IS ISO 9001: 2008 CERTIFIED

3 GENERAL The Series 70CV2000 Chloromatic TM Valve used inside the Gas Dispenser Cabinet is a minor variation of the Valve discussed in Instruction Bulletin The most obvious difference, is the mounting orientation, which is 180 from that shown in the printed bulletin; that is, the valve is at the top as shown in Figure 1. The Chloromatic Valve is factory installed, wired and tested prior to shipment therefore there is no installation requirement. All customer wiring for the basic unit is shown in Instruction Bulletin This contains retransmission and alarm options for which wiring diagrams are included. Also included is a wiring diagram for the optional hand-automatic control station (no customer wiring required if factory installed). GAS FLOW CAPACITY The gas fl ow capacity of the Series & FX4400 Gas Dispensing Systems is shown in Table A. Gas fl ow capacities to 500 lb/d (chlorine) use the valve shown in the printed bulletin with 1/2" NPT connections. Above 500 lb/d a larger capacity valve with 1" pipe fi tting is used. The internals of the valve are essentially the same; up to 500 lb/d a 3/8" orifi ce is used and a 1/2" orifi ce above that capacity. Figure 2 shows the two size valve plugs used; the valve orifi ce is sized accordingly. Figure 2 - Valve Plugs Figure 1 - Component Identification Chlorine (CL2), Sulfur Dioxide (SO 2 ) Table 1 - Flow Ranges Ammonia (NH 3 ) lb/d g/h kg/h lb/d g/h kg/h OPTIONAL FEATURES I. Retransmission Additional circuits, on the option circuit board, provide for retransmission of a 4-20 ma dc signal that is directly proportional to the valve position and thus to gas fl ow rate. In order to prevent transmission of false signals, the retransmission signal is interlocked with two vacuum switches. One switch measures the vacuum created by the ejector while the other switch measures the pressure in the gas container(s). Either a loss of ejector vacuum (low vacuum) or an empty gas container(s) (high vacuum) will open a contact to break the retransmission circuit. If either switch opens, a 4 ma current will be retransmitted. The additional customer wiring required for this feature is shown in Figure 3. This wiring is in addition to the basic wiring shown in Instruction Bulletin The retransmission output connects to the RO terminal on the option circuit board and returns to the COM terminal on the main circuit board. A load between 0 and 800 ohms is permissible; avoid running the signal lines in the same conduit as the power lines

4 The vacuum switches are factory installed in the cabinet and wired by DNWT. Figure 5A shows the wiring diagram for future troubleshooting purposes. The same vacuum switches are used for the optional alarms and are discussed in Section II, that follows. See section titled Functional Description for details regarding the electronic circuits used for retransmission. II. Alarms Vacuum switches may be furnished to provide an electrical alarm contact. Note: if the retransmission option is selected, the same vacuum switches are used for dual purposes (see Section I, preceding). Alarms are defined as follows and either one or both may be furnished. 1. Loss of Vacuum (low vacuum). This switch monitors the vacuum produced by the ejector. The loss of water to the ejector or a disconnected gas line could result in a loss of vacuum causing the alarm contacts to close. 2. Excess Vacuum (high vacuum). This switch monitors the gas cylinder or container. The closing of the shutoff valve at the cylinder or an empty container will produce a high vacuum. Either action will cause the alarm contacts to close. Figure 3 shows the additional customer wiring required if the alarm option is specifi ed. Figure 5B shows the factory wiring of these switches for future troubleshooting. III. Hand-Auto Station Operation of the Chloromatic TM Valve in the Series & FX4400 Gas Dispensing Systems is identical to that discussed in Instruction Bulletin The dosage adjustment (with its on-off power switch) and the 3-position "1, D, 2" switch (optional) are mounted on the valve case. The optional hand-auto station mounted on the cabinet is used by operator to select either the "manual" or "automatic" mode of operation. Figure 4 shows the legend plate of this station which is mounted on the face of the cabinet, to aid in its understanding. If the "manual" mode is selected, the valve motor is inoperative and will stay in the last position selected. To change gas fl ow through the valve, the operator turns the 3-position switch to either (+) or (-); the switch is spring returned to its normal or off position. As long as the switch is held in the (+) or (-) position, the valve motor is running. It takes approximately seconds for the valve to run full scale. From the front of the cabinet, one can observe the fl owmeter reading as an indication of valve position. If the switch is held in the (+) position, the valve moves open; in the (-) position, the valve moves shut. If the "automatic" mode is selected, the valve is automatically positioned as directed by the input signal(s). In the automatic mode, the (+) and (-) switch positions are inoperative. This hand-auto station is factory installed and wired. Figure 5A shows the wiring diagram used for installation, for future troubleshooting purposes only. Figure 3 - Additional Customer Wiring for Retransmission and/or Alarm Output

5 Figure 4 - Legend Plate for Hand-Auto Switch FUNCTIONAL DESCRIPTION I. Retransmission Option The retransmission signal is taken directly from the feedback potentiometer buffer and is converted from a voltage to a current. Adjustments are provided for zero and span. The current signal provides direct output for customer use and an adjustable current limit; both to be discussed. The V/I converter functions by balancing the feedback voltage and an intermediate voltage signal (which is generated by an intermediate current). Pins 5, 6 & 7 of amplifi er U201B receive the summation of the feedback signal through resistor R21B and zero adjust potentiometer R220 thru R219. This signal is balanced against the intermediate feedback voltage on the wiper of the span adjustment R225. Span and zero potentiometers are adjusted so that a 5 V drop occurs across R224 for a 20 ma output and a 1 V drop at 4 ma output. The amplifi er U201B and Q201 serve the function of shifting signal level to the +24 V supply. Amplifi er U201C (pins 8, 9 & 10) is used to drive the output transistor, Q203. The intermediate voltage signal of R224 on pin 9 is matched at pin 10 by the voltage drop across R227 (negative feedback signal). This voltage drop is the result of current drawn by R236 and Q203. Current limiting is provided through FET transistor Q202, R230 and the limit adjustment potentiometer R231. The limit potentiometer is adjusted so that Q202 begins shutting off when more than 4 ma attempts to pass through the limit circuit. Externally mounted vacuum switches are used with the retransmission option. The switches are wired in series and connect across terminals TB & 16. The switch contacts are closed when there is 1) gas in the cylinder and 2) water to the ejector to create suffi cient vacuum. Under this condition, current will fl ow to the RO terminal as dictated by the feedback potentiometer through the V/I converter. If either vacuum switch opens, only the 4 ma allowed by the current limit circuit can fl ow to the RO terminal. Note: Resistors R221 and R228 are inserted if the retransmission circuit is omitted. The resistors prevent the amplifi ers from oscillating and disturbing the other amplifiers. II. Alarm Option The alarm option consists of either one or two vacuum switches, as specifi ed. The switches are mounted within a metal enclosure which has a terminal barrier strip for customer connection of the alarm(s). If retransmission was also specified, the switches serve a dual function where the other set of contacts are used as a gating circuit. All piping and wiring required for the alarm(s) is completed by the factory; no adjustments are required. III. Hand-Automatic Station The Hand-Auto Station consists of two switches that mount on the face of the cabinet. The upper 2-position switch selects the Automatic or Hand mode of operation. The lower 3-position switch is operative in the hand mode and is used to operate the valve motor. With the switch held in the (+) position, the open winding of the valve motor is energized. Conversely, with the switch in the (-) position, the close winding of the motor is energized. If the 2-position switch is placed in the Automatic mode, the (+) (-)switch is de-activated. Here, the signals from the motor logic and motor drive sections operate the motor. PARTS LIST All parts shown in Parts List Bulletin are valid. Parts listed here are additional parts used with the Chloromatic TM Valve when used in the Series & FX4400 Gas Dispensing Systems. The valve body, cover, orifice and plug (identified as Keys 55, L 59 in Parts List Bulletin ) are valid for 500 PPD Cl 2 or less. Higher capacities use a 1/2" orifi ce & 1/2" valve plug; also the valve body and cover are connected with rigid pipe that is solvent welded. Part numbers are as follows: Key Qty Part Description Part Number 55 1 Valve Plug Assembly --- CL2 & SO2 Service 1000 PPD or 20 kg/h 668B143U PPD or 40 kg/h 668B143U PPD or 60 kg/h 668B143U20 NH3 Services 500 PPD or 10 kg/h 668B143U PPD or 20 kg/h 668B143U Valve Body 668B157U Orifi ce 433F239U Valve Cover 433B062U

6 Figure 5A - Modifi cations & Additional Wring Design improvements may be made without notice. Represented by: De Nora Water Technologies 3000 Advance Lane Colmar, PA ph fax web: mail: info.dnwt@denora.com SEP Registered Trademark All Rights Reserved.