Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 1 - DESIGN SPECIFICATIONS & DATA Resistance Temperature Devices (RTDs) An RTD is a resistor type sensor, in which the electrical resistance accurately varies with temperature change. When connected to the proper electronics, the resistance is interpreted as temperature. When RTDs are ordered for the main bearings, Ariel supplies dual-element RTD instrument assemblies, consisting of two RTDs in each instrument for each main bearing. Each element is a three-wire, 100 ohms (at 0°C), Alpha = 0.00385 ohms/ohm/°C, platinum thin film type sensors. Dual element RTDs are provided to allow for rewiring instead of replacing the sensor in the event of an element failure. The advantage of the dual-element RTD assembly is that the redundancy saves time by allowing the operator an opportunity to restore bearing temperature monitoring without entering the crankcase for each RTD failure. Wire: The dual element RTDs use 24 AWG (American Wire Gage) instrumentation wire from the junction box mounted on the side of the compressor frame to the sensor wiring. An RTD three wire set may be wired using a two, three, or four wire system. More wires increases accuracy. Ariel recommends using standard foil shielded instrumentation cable runs from the compressor frame to the control panel. Shields should be grounded in the control panel. Sensor Accuracy: 100 + 0.12 ohms at 0°C = 1.1°F (0.6°C), or 0.6 percent. Terminals: Can use any standard terminals. Element 1 Element 2 For each instrument, a single RTD three-wire set is used to connect to the monitoring circuit. If the connected RTD fails, it can be disconnected and the remaining RTD three-wire set can be used to connect to the circuit. Unused wire ends should be insulated from each other and conduit ground. RTD's are furnished with two red wires and one white wire for the one element, and two black wires and one green wire for the other element to simplify the wiring requirements. Main Bearing Temperature Alarm and Shutdown Limits One of the following, minimum, is to be provided for main bearing temperature alarm and shutdown to Ariel compressors: 1. Main bearing temperature high alarm and shutdown. - The alarm and shutdown should be set as close as practical above the normal operating temperature. Ariel recommends 20°F (12°C) over normal operating temperature for alarm and 30°F (18°C) for shutdown. Maximum values of 220°F (104°C) for alarm and 230°F (110°C) for shutdown apply. Normal operating temperature is the PAGE 1 - 26 7/09 White Red Red Green Black Black FIGURE 1-14 DUAL ELEMENT RTD WIRING DIAGRAM
FOR MODELS: JGZ AND JGU SECTION 1 - DESIGN SPECIFICATIONS & DATA And/or average of all main bearing temperatures at design load when oil temperature stabilizes and all components are heat soaked. 2. High main bearing temperature differential alarm and shutdown. - Main bearing differential temperature is defined as the difference between the maximum and minimum of all main bearing temperatures. Ariel recommends the alarm set to 20°F (12°C) and shutdown at 30°F (18°C), differential. It is possible after a warm shutdown that main bearing number 1 will cool faster than the others. Provisions should be made such that a cooler number 1 bearing will not prevent a restart. Zone 1 Environment A Zone 1 environment requires the installation of proper intrinsically safe or equivalent protection to fulfill the electrical requirements, where applicable. 7/09 PAGE 1 - 27
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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