Heavy Duty Balanced Opposed Compressors - Ariel Corporation

13.11.2012 Views
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION Proflo PF1Ariel recommends using Normally Closed (NC) configuration. The Ariel Proflo is provided from the Ariel factory programmed for NC operation. The reason NO and NC are defined this way is that it is easier for mechanics and operators who do not have an electrical background to understand the switch state when the divider block is cycling. Proflo PF1 - Using Pulse Output and Alarm Circuit at Same Time: If the control system needs to read both the block cycling, proximity switch, and the alarm contact the following things must be taken into consideration. Proflo PF1 1. The Proflo PF1 has an on board processor and data acquisition system (DAQ). The DAQ system records the time for each divider block cycle and stores this data to EEPROM. The data is accessible and can be downloaded through the Proflo infrared port to a Palm Operating System handheld computer with FFT software. Therefore, it may not be necessary to have the control system read and count the number of times the divider block cycles. 2. If a PLC is used to read the pulse output, the PLC may be programmed to watch for the divider block cycling and issue a shutdown if the block does not cycle for a given time. This may eliminate the need to wire to both Proflo PF1 outputs and save on field wiring connections. 3. The Proflo PF1 alarm output, red wires, and the divider block cycle output, blue wires, are not isolated from each other. If it is necessary to read both Proflo outputs, the isolation must take place on the equipment that is reading the contacts. If the PLC input card is not isolated between channels both the alarm and pulse outputs will act as the alarm contact. These contacts must also be isolated from other inputs. See Figure 4-8: control line Optical Iso control line power mosfets power mosfets Reverse Polarity circuits Reverse Polarity circuits Mounted on Compressor, Outputs are not isolated Blue Blue Red Red GND +V Input Card Return Return FIGURE 4-8: EXAMPLE DIAGRAM TO READ BOTH PULSE & ALARM CONTACTS 4. If Isolated inputs are not an option, another way to achieve the output signal isolation is to connect the alarm/shutdown contact to the safety system and install another proximity switch for the control system to read and calculate oil consumption. Refer to the “Proflo PF1 accessories” section below for a proximity switch part number. 5. If Isolated PLC inputs are not an option, yet another method of achieving isolation 7/09 PAGE 4 - 45 Power Ch 1 Power Ch 2 Inputs must be isolated between channels

FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION between the Proflo PF1 outputs and the PLC is to wire the Proflo to the "coil" side of a relay. Then use the contact side of the relay to the control system. There are relays on the market that are very cost effective. Ariel recommends using a solid state type relay for long life. See Figure 4-9: Proflo PF1 control line Optical Iso control line power mosfets power mosfets Reverse Polarity circuits Reverse Polarity circuits Mounted on Compressor, Outputs are not isolated FIGURE 4-9: EXAMPLE DIAGRAM TO READ BOTH PULSE & ALARM CONTACTS - USING RELAYS Some relays may require a current limiting resistor to keep from shorting the power supply through the relay coil. Many relays have a built in current limiting circuit. It is the responsibility of the control system designer to choose proper relay components. Proflo PF1 - Using PLC to Calculate Oil Consumption: Blue Blue Using the blue wires or the pulse output, it is possible for the control system to calculate the amount of oil the system uses. Following is an example of how to do this. TABLE 4-2: EXAMPLE DIVIDER BLOCK: GND +V BLOCKS IN 3 X 2 12T 0.012 0.024 18T 0.018 0.036 18T 0.018 0.036 6S 0.006 0.012 18T 0.018 0.036 0.144 x 0.0346 = 0.004987 pints/cycle Blocks are numbers stamped into the divider blocks mounted on the compressor. Block numbers divided by 1000 = volume, In3 (cubic inches). x 2 are for each block moving in 1 full cycle. 0.0346 is the conversion from in 3 to pints, US liquid (pints/in 3 ). (Divide pints by 8 = gallons, US liquid) Red Red Relays Provide Isolation PLC inputs do not have to be isolated PAGE 4 - 46 7/09 Relay Relay Ch 1 Ch 2 PLC

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