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1.3 SPECIFICATIONSINPUT POWER

339-0083-000 5-2005 Electronic Capacity Control - 15852 SECTION 1DESCRIPTION

Table 1. Stroke Adjust Shaft & Pump Opera-tion Reference ManualsPUMPMANUAL 1.1 GENERAL INFORMATION In this age of sophisticated process control con-cepts, many people are taking advantage of the lat-est breakthroughs in technology to upgrade theirown equipment and systems. The Milton Roy Elec-tronic Capacity Control (ECC) easily interfaces with computerized process and process instruments, asthe ECC will adjust the output of a metering pump from 0% to 100% in response to a 4 to 20 milliamp or 1 to 5 VDC signal from a computer or other source. This outstanding feature can be purchasedas an integral part of the pump, or it can be boughtseparately and field installed. The ECC mounts to the housing of the pump and operates in place ofthe manual stroke adjustment. MacRoy G339-0049-000 MacRoy D339-0076-000Milroyal G339-0064-000 1.2 PRINCIPLE OF OPERATION The ECC allows remote adjustment of the volumeof liquid delivered by the metering pump. This isaccomplished by utilizing a 4-20 mA command sig- nal from a Milton Roy Remote Panel Mount (ARPM-100/200) or Remote Wall Mount (ARWM- 100/200) remote controller (manual 339-0021- 000), or a customer’s control system. In a closed loop control system, the ECC accepts the com-puter or controller 4-20 mA signal directly and pro-vides immediate and accurate control of the pumpflow under varying process conditions.When the ECC receives the 4-20 mA commandsignal, the drive motor responds by moving theECC to the required position. As the ECC moves, itchanges the position of the pump’s stroke adjust shaft, thus altering the pump’s flow rate. Refer to Table 1 which lists reference manuals containinginformation on the stroke adjust shaft and pump operation. If the pump flow rate needs to be monitored, theECC then communicates its position by outputting a nominal 4-20 mA or (1-5 VDC) signal. This signalcan be intercepted and translated by an ARPM-100/200 or ARWM-100/200 or other user supplied equipment to display the current ECC position. 115 VAC, 50/60 Hz, 1 phase ±10% (standard)220 VAC, 50/60 Hz, 1 phase ±10% (optional)1 amp max CONTROL SIGNAL INPUT 4-20 mA into 250 ohms impedance (standard)Direct acting: 4-20 mA (see note below)Split range: 4-12 mA, 12-20 mA1-5 VDC 440K load, DIP selectable (optional) NOTE Table 1. Stroke Adjust Shaft & Pump Opera-tion Reference ManualsPUMPMANUAL As supplied, the ECC is direct acting(pump capacity increases with increasing input signal to ECC) although it may be converted to reverse acting by followingthe procedure outlined in Section 3, “Oper-ation”. POSITION FEEDBACK OUTPUT mRoy339-0047-000maxRoy B339-0005-000Milroyal C339-0009-000Milroyal B339-0066-000Milroyal D339-0010-000 4-20 mA, max 500 ohm load (standard) 1-5 VDC, min. 250 ohms impedance, DIP select-able (optional) 1