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Summary of Contents for IWAKI WALCHEM EHC Series
- Page 1 EHC & EHE FF Series Electronic Metering Pump Instruction Manual Part of the Family of Products Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA TEL 508-429-1440 FAX 508-429-1386 WEBSITE: www.iwakiwalchem.com...
- Page 2 IWAKI WALCHEM Corporation and for the purposes disclosed in writing at the time purchased, if any. IWAKI WALCHEM Corporation’s liability under this warranty shall be limited to replacement or repair, F.O.B. Holliston, MA U.S.A. of any defective...
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Page 3: Table Of Contents
TABLE OF CONTENTS Thank you for choosing a Iwaki Walchem EH-FF Series metering pump. This instruction manual deals with the correct installation, operation, maintenance and troubleshooting procedures for the EHC-FF and EHE-FF model metering pumps. Please read through it carefully to ensure the optimum performance, safety and service of your pump. -
Page 4: Introduction
This action pulls the diaphragm out of the head cavity increasing volume and decreasing pressure. Atmospheric pressure then pushes liquid from the supply tank through the suction check valves to refill the pump head. EHB & EHC Series Metering Pumps... -
Page 5: Model Code
Model Code 11UP Pump Series EHC Electronic metering pump with external pulse control or manual speed control (adjustable to 360 strokes per minute) and manually adjustable stroke length. (Typical turndown ratio 125:1.) EHE Electronic metering pump with external pulse control or manual speed control (adjustable to 360 strokes per minute) and manually adjustable stroke length. -
Page 6: Specifications
Specifications Operating Conditions Ambient temperature 32°F to 122°F (0°C to 50°C) Relative humidity 30% to 90% non-condensing Liquid Temperature 32 – 140 °F (0 – 60 °C) Adjustment Range Recommended stroke length adjustment range 40% to 100% Recommended frequency adjustment range 0 to 360 strokes per minute Dimensions EHC-30/35FF... - Page 7 EHC all variations 3.94 0.28 0.63 0.39 1.81 0.24 EHE-55FF 0.39" x 0.47" 0.39" x 0.47"...
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Page 8: Installation
INSTALLATION Unpacking Open the shipping carton and inspect contents for damage. If any items are missing or damaged contact your local distributor to arrange for replacement. Location Choose a location for the pump that is clean, dry, close to an electrical outlet, and allows convenient access to stroke length control, frequency control, and tubing connections. -
Page 9: Installing Back Pressure/Anti-Syphon Valve
Installing Back Pressure/Anti-syphon Valve It is recommended for all EH-FF installations that a back pressure/anti-siphon valve be used to ensure pump accuracy and repeatability. The back pressure/anti-siphon valve acts to create back pressure when pumping into atmosphere or low pressure applications. It also prevents siphoning through the pump when the supply level is above the installed unit. -
Page 10: Operation
OPERATION Priming R-Module Install the pump as described above. With the pump turned on, set stroke length at 100% and frequency at 100%. Liquid should move through the suction tubing and into the pump head. When liquid enters the discharge tubing at the pump head set frequency to 0% to stop the pump. -
Page 11: Calibration
Pumps using the ‘Y’ Control Module The pump will operate best with the stroke length at 100%. If less than full output is required, set the frequency to the desired strokes per minute using the UP and DOWN arrow keys. Example: Model EHC35FF-11UPY12 has maximum output of 420 ml/min. -
Page 12: External Control
External Control Pumps using the ‘R’ Control Module For pulse proportional external control of pump frequency, connect the control signal leads to terminals 4 (positive) and 6 (common) inside the control module. The input signal should not exceed 360 pulses per minute (See Figure 9). The external circuit should be capable of switching 10 VDC at 2 mA with a pulse width of 10 ms to 100 ms (for R &... - Page 13 B. Pumps using the ‘Y’ Control Module The EH-Y Series is able to operate in both digital and analog external modes. An external stop function is also available. Display/Keypad Overview Alpha/numeric display. Indicates STOP indicator. Visible stroke frequency, external mode or when the pump is stopped external settings.
- Page 14 C. Pumps using the ‘E’ Control Module The EHE Series is able to operate in both digital and analog external modes. An external stop function is also available. Display/Keypad Overview Alpha/numeric display. Indicates UP key. Increases stroke frequency, external mode or numeric values.
- Page 15 EH-Y/E Quick Reference Guide S/S = Start/Stop key EXT = External key From: Press: WAIT run in manual mode decrease frequency (1 to 360 spm) increase frequency (1 to 360 spm) external mode external values Running in manual mode decrease frequency (1 to 360 spm) increase frequency (1 to 360 spm) return to WAIT...
- Page 16 WAIT Increase Decrease Pump Speed SET EXTERNAL SET EXTERNAL MANUAL EXTERNAL MODE VALUES DIG: ANA: Incr Decr toggles to scroll thru Pump Speed between A1, P1, A2, P2 X, / Incr Decr Numeric Value Digital Mode In digital mode, the pump accepts a pulse signal from a flowmeter or other instrument.
- Page 17 Sensor Power Y-Module The control circuit of the Y Module has the ability to provide 12 VDC at up to 20 mA to power a Hall effect sensor or similar device. Connect the sensor power leads to terminal 4 (positive) and terminal 8 (negative) of the terminal block.
- Page 18 Press EXT to operate the pump in external mode. The pump will now respond to the incoming pulse signal. The stroke length can be adjusted manually to set the volume pumped per stroke. Analog Mode In analog mode the pump will accept a milliamp signal and produce a pump speed proportional to the signal level received.
- Page 19 Strip 1/4” insulation from conductors. See schematic below for connections for Y- Module or E-Module control unit. Y-Module E-Module 6 7 8 6 7 8 Digital Input White Black Stop Input Black White Stop Input Digital Input Green Green (dry contacts) Power Ground Ground Power...
- Page 20 2. Set the value To set values for analog operation, press EXT and simultaneously. The display will show A04.0 (or some value between 00.0 and 20.0 mA) with the point 1 indicator highlighted. Press to adjust the value to the desired analog signal level for point 1.
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Page 21: Stop Function
STOP Function Additionally, the pump can be controlled in start-stop mode. In this mode, AC power is applied continuously and pump operation is stopped by completing the circuit between the positive ‘stop’ and common terminals inside the control module (R Control Module: 5 (positive) and 6 (common), Y Control Module: 7 (positive) and 8 (common), E Module: 6 (positive) 8 (common)). -
Page 22: Maintenance
MAINTENANCE Caution: Before working on the pump, disconnect the power cord, depres- surize the discharge tubing and drain or flush any residual liquid from the pump head and valves. Diaphragm Replacement Disconnect AC power to the pump and disconnect the suction tubing, discharge tubing, and air vent tubing. -
Page 23: Troubleshooting
TROUBLESHOOTING Caution: Before working on the pump, disconnect the power cord, depres- surize the discharge tubing and drain or flush any residual liquid from the pump head and valves. Problem Possible Cause Corrective Action Pump does not start Faulty wiring Correct wiring Improper voltage Connect to proper voltage source... -
Page 24: Service Policy
Problem Possible Cause Corrective Action Liquid leaks Fitting is loose Tighten Pump head is loose Tighten pump head bolts Torque: See Section 4.1 Diaphragm is damaged Replace diaphragm O-ring or valve gasket Install o-ring or valve gasket missing SERVICE POLICY The EHC-FF and EHE-FF Series electronic metering pumps have a 2-year warranty.
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