EPTA - Dwyer Instruments, Inc.
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1. EPTA Installation Instructions www dwyer inst com Dwyer Instruments Inc P D 080107 2 Michigan City Indiana2. The feedback signal range on all selections is 0 5 VDC and is proportional to the output pressure range selected The output and feedback signal will continue to vary proportionally ifthe input signal is increased beyond its upper limit if enough main air pressure is available Note Ifpowertothe EPTA SO orEPTA BO is lost the branch line control valve will close and branch line pressure will be maintained assuming no branch line leaks If powerto the EPTA S1 or EPTA B1 Fail Safe is lost the branch line 3 way valve will exhaust branch line pressure to 0 psig 0 kPa For DIN rail mounting of EPTA S use or order A 400 Kit EU Commission Directive 2002 95 EC RoHS Compliant Power Supply Voltage Air Supply 24 VDC 10 5 Maximum 25 psig 172 38 kPa minimum 18 psig 124 11 kPa 24 VAC 10 50 60 Hz at terminals main air supply 0 10 psig 68 95 kPa 0 15 psig 103 43 and 0 20 Supply Current psig 137 9 kPa jumper selectable output pressure ranges 180 mA max 200 mA max EPTA B1 model Air Flow 20 psig 137 9 kPa main 15 psig Feedback Signal Output Factory Calibrated 0 5 VDC range selected Input Signal Ranges 103 43 kPa Out 750 scim Exhaust rate 750 scim Accuracy 1 full scale at room temperature 0 5 VDC Infinite ohms 2 full scale 32 to 120 F 0 to 48 8 C 0 10 VDC Infinite ohms Override Contact Rating 24 VAC or 24 VDC 1A maximum 0 10 VDC Infinite ohms 0 20 mA 250 ohms
3. s and Manual Auto Switch 5 F 7 2 20 psi Power Override Feedback Dry Contact P S S 5 Analog Input 5 Signal BB Branch Pressure Feedback Signal Jo READ THESE INSTRUCTIONS BEFORE YOU BEGIN INSTALLATION Ground yourself before touching board Some components are static sensitive MOUNTING Circuit board may be mounted in any position If circuit board slides out of snap track a nonconductive stop may be required Use only fingers to remove board from snap track Slide out of snap track or push against side of snap track and lift that side of the circuit board to remove Do not flex board or use tools POWER CONNECTIONS THIS PRODUCT ACCEPTS 24 VDC or 24 VAC POWER Be sure to follow all local and electrical codes Refer to wiring diagram for connection information Be sure to make all connections with power off 1 DC Power Refer to wiring diagram for connection information If the 24 VDC power is shared with devices that have coils such as relays solenoids or other inductors each coil must have an MOV DC Transorb or diode placed across the coil or inductor The cathode or banded side of the DC Transorb or diode connects to the positive side of the power supply 2 AC Power Refer to wiring diagram for connection information Check the wiring configuration of any other loads that may be connected to this transformer If required by BAS or controller specification the 24 VAC neutral can be earth grounded at the
4. transformer Analog input digital input and analog output circuits should not be earth grounded at two points Any field device connected to this transformer must use the same common If you are not sure of other field device configuration use separate transformers for isolation If the 24 VAC power is shared with devices that have coils such as relays solenoids or other inductors each coil must have an MOV AC Transorb or other spike snubbing device across each of the shared coils Without these snubbers coils produce very large voltage spikes when de energizing that can cause malfunction or destruction of electronic circuits Refer to wiring diagram for connection information 3 You should measure the actual voltage output of the secondary If the output is not fully loaded you may read a higher voltage than the circuit board can handle ADJUSTMENT OF GAUGES If installation requires adjustment of the gauge for proper reading of the face turn the gauge no more than 1 2 turn in either direction O rings in the bottom of the gauge port will allow this without leakage Warranty does not include malfunction due to clogged valve Main air port is filtered with the supplied 80 100 micron integral in barb filter Part A 403 Periodically check the filter for contamination and flow reduction Replace if needed Part A 403 The surface between the manifold and pressure transducer is a pressure seal Minimize stress between the circuit board and the
5. Bulletin L 39 EPTA Analog Current or Voltage to Modulated Pressure Output and Fail Safe EPTA B shown Signal Input Range Selector M B Blue manifold on EPTA S1 and EPTA B1 models 8 3 VDC 8 10 VDC ile 8 12V Ue Bl 10V O GN Sle a j15V Sjs a 5V 8 _ 20MA _5 20MA J1 Jl Analog Current or Voltage Zero is Modulate 3 Pressure Factory Set Do not adjust 8 15 VDC 3 20 mA aja e 10V aje a ji V A SPAN Pot Set for maximum desired lt Je 15V Ja a 15V SPAN pressure with maximum input signal a a 2 MA E al 2 MA C Y lt OFFSET Pot Set for minimum desired J1 J D L1 OFFSET pressure with minimum input signal PWR B 18 PSI e A 8 15 PSI B PWR SIG EB DV OV ee PSE A Pressure Output Range Selector MANUAL ANANA HA o ex Ble elev 0 10 psi 0 13 psi AUTO TR D MANUAL B BIA a a alB B E O O a EC Ba J2 J2 A A Manual Override Pot
6. manifold by holding the manifold in one hand while installing pneumatic tubing onto the fittings and use care when removing tubing to avoid damaging fittings or moving manifold Dwyer Instruments Inc www dwyer inst com EPTA Installation Instructions Michigan City Indiana 1 P D 080107 CHECKOUT For optimum performance and reduced noise the EPTA B1 unit requires a branch air line capacity equal to at least 25 feet of 1 4 0 D polyethylene tubing to operate without oscillation and the EPTA S unit requires a branch air line capacity equal to at least 15 feet of 1 4 O D polyethylene tubing to operate without oscillation Do not power without main air provided With power off select one of the four input signal combinations by moving the jumper shunt J1 identified as Input Signal Range Selector Select a preset pressure output range by moving jumper shunt J2 identified as Pressure Output Range Selector or set custom range as described below SETTING CUSTOM OUTPUT PRESSURE RANGE Verify the MANUAL AUTO switch is in the AUTO position In AUTO the manual override pot is inactive the override contacts are open and the analog input signal is supplying the set point The offset pot may be adjusted to any desired offset between 0 and 14 psig When in the MANUAL position the override contacts are closed the offset pot is inactive and the manual override pot is supplying the set point the analog input signal is locked out Supply power a
7. nd the LED power indicator will light but only measurement will verify proper voltage 1 Setting the minimum pressure Make sure the signal connections are made and _input is at minimum Place the manual override switch to the AUTO position Adjust the OFFSET pot to the desired pressure output or until the actuator just starts to move The adjustment range of the OFFSET pot is 0 to 9 psig 62 05 kPa 0 to14 psig 96 53 kPa or 0 to19 psig 131kPa depending on range selected Zero pot is factory set do not adjust 2 Setting the maximum pressure Now place the manual override switch to the MANUAL position Turn the MANUAL pot to produce the maximum branch line pressure available Turn the SPAN pot for the maximum desired output pressure or until the actuator just stops Be sure the MAIN air pressure is at least 2 psig greater than the desired maximum branch output pressure 3 Repeat Because the OFFSET and SPAN pots are slightly interactive steps 1 and 2 must be repeated until the desired minimum and maximum pressures are repeatable Since the MANUAL potis set for maximum pressure itis only required that you switch the manual override switch back and forth from MANUAL to AUTO when repeating steps 1 and 2 Calibration is usually accomplished in less than 3 iterations Apply minimum and maximum input signals and measure response Response between the minimum and maximum values will be linear therefore software algorithms are easy to derive
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