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