Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION vice visit the vendor literature section of the Ariel web site. TABLE 4-5 FORCE FEED LUBE SYSTEM MONITORS - SPECIFICATIONS ITEM PROFLO KENCO DNFT DNFT - PROGRAMMABLE Shutdown Signal YES NO YES YES Proximity Signal YES (0.5 sec pulse) YES (switch) YES (switch) YES (switch) Local Data Storage YES NO NO Count Display Infrared Port YES NO NO NO PLC Creates Shutdown NO YES NO NO Remote Mounting YES NO NO NO Area Classification CSA CSA CSA, CE, EX, ATEX CSA, CE CSA 203633 Class I, Div 2, Groups ABCD T4A 044787 Class I, Groups ABCD: Class II, Groups EFG: Class III CE N/A N/A I. Shutdown switch - This is a device that monitors the position of the divider block pin and supplies a shutdown contact. If the divider block stops cycling for a given time a shutdown signal will be sent to the control system. APPLICATION NOTES - Shutdown Switch 108334 Class I, Div 1 Groups ABCD T5; &/ or Class I, Zone 1 Ex md IIC T5 0344 Class I Div 1; Groups ABCD T4 Normally open (NO) vs. Normally closed (NC) Shutdown switch 108334 Class I, Div 1 Groups ABCD T5; &/ or Class I, Zone 1 Ex md IIC T5 0344 Class I Div 1; Groups ABCD T4 EX N/A N/A II 2G EEx mIIB T5 N/A KEMA N/A N/A Battery Cost Factor New Unit (2) Energizer Lithium “AA” Size 00ATEX1090X/ AMB. -40°C to +85°C Divider block monitoring devices define their operation opposite from other industries. Most other industries define the switch state as the state the switch is in when it is on the shelf. (That is: If a momentary push button switch is NO, then when it is taken out of the box the 7/09 PAGE 4 - 21 N/A None Ariel P/N A-10807 Ariel P/N A-10807 $0 Standard Minus $ $0 Standard for CE Plus $ Shutdown Time Programmable PLC 3 minutes Temperature to185°F (85°C) to 220°F (104°C) -40°F to +185°F (- 40°C to +85°C) Programmable 20 sec. to 4 minutes -40°F to +185°F (-40°C to +85°C) Max. Switch Voltage 36 VDC 200 VAC/VDC 240 VDC 10 to 120 VAC Max. Switch Current 0.5 Amps 0.5 Amps N/A N/A Max. Switch Power N/A 10 Watts DC 2.5 VA 2.5 VA Local Cycle Indicator YES - LCD Separate Indicator YES - Flashing LED YES - LCD Display +LED De-bounce Included NO NO YES YES
FOR MODELS: JGZ AND JGU SECTION 4 LUBRICATION switch will be open until the button is pushed and the contact will close. If a momentary push button switch is NC then when it is taken out of the box the switch will be closed until the button is pushed.) This does not apply to divider block monitoring devices. Divider block device manufacturers have "simplified" things for the mechanic. Normally Open (NO) refers to the state the switch is in when the divider block is cycling or the unit is running. An NO switch means that when the unit is running the shutdown switch is open or non-failsafe. If a wire falls off or is cut while the unit is running the control system will never stop the unit. If the device is damaged or a wire has come loose at startup the control system would never know there is a problem. An NC switch means that when the unit is running the shutdown switch is closed or failsafe. Now if a wire falls off or is cut the control system will detect that the switch is open and shutdown the unit. Ariel recommends using a NC (failsafe) switch. However, when a NO (non-failsafe) switch is used, Ariel recommends testing the shutdown circuits at least once a month. II. Proximity switch - This is a device that will sense the position of the divider block piston and will produce a switch change of state or a pulse every time the pin changes position. This device must be combined with a PLC or some other counter/timer device to produce the shutdown. Some devices on the market will open the switch when the pin is toward the left and close when the pin is toward the right. Others will produce a 0.5 second pulse when the pin moves from left to right. If this is used it is the responsibility of the control system to sense the switch cycling and stop the unit if a block stops cycling. APPLICATION NOTES - Proximity Switch Ariel recommends setting up the control system to find the time between cycles triggered when the switch transitions from off to on. See Figure 4-7 suggested control system block diagram. 1. Shutdown time with no lubrication - The distribution block cycle times will vary slightly from cycle to cycle. Seeing 12 seconds one cycle then 15 seconds the next then 14 the next is normal. The recommended shutdown time is: 2 times the design cycle time + 30 seconds limited between 30 seconds and 3 minutes. LIMIT (2 x design cycle time + 30 seconds) 30, 180 Design cycle time is found on the compressor lube sheets or tag on the compressor. 2. DE-BOUNCE and latching circuits - Depending on the device and control system scan time it may be necessary to include de-bounce hardware and/or software. Some of the devices do not have built in de-bounce circuits and can cause a fast control system to double or triple count. Other times it may be necessary to latch the input thus allowing the control system to detect only the first transition from low to high. This becomes significant when displaying the cycle time for the operator to set the pump flow rates and when calculating the total oil through the divider block. 3. Suggested Operator Displays: Divider block cycle time - The operator will need to set the lube system pumps according to the recommended divider block cycle times. It is helpful for the operator to have a display of divider block cycle time in seconds. This will be used to adjust the lube pumps as the pumps wear out and when the pumps are replaced to set divider block cycle times. PAGE 4 - 22 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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