Control Sequence of Operation

When less than 2.5 seconds remain before compressor start, a starter test is conducted to verify contactor states prior to starting the compressor. The following test or start sequence is conducted for ‘‘Wye-Delta’’ starters: Also refer to Figure 24.

A. Test for transition complete contact open (2A1-J12-2) –160 to 240 msec. An MMR diagnostic will be generated if the contact is closed.

B. Delay time - 20 msec.

C. Close start contactor (2K1) and check for no current - 500 msec. If currents are detected, the MMR diagnostic ‘‘Starter Fault Type I’’ is generated.

D. Stop relay (2A1-J10-3 to 1) closes for one second for test “C” above.

E. Delay time - 200 msec. (Opens 2K1).

F. Close shorting contactor, (2K3) and check for no current - one second. If currents are detected the MMR diagnostic ‘‘Starter Fault Type II’’ is generated. (Starter Integrity test)

G. If no diagnostics are generated in the above tests, the Stop Relay (2A1- J10) is closed for 2 seconds and the Start Relay (2A1-J8) is closed to energize the start contactor (2K1). The shorting contactor (2K3) has already been energized from (F) above. The compressor motor (4M1) starts in the ‘‘Wye’’ configuration, an auxiliary contact (2K1-AUX) locks in the start contactor (2K1) coil.

H. After the compressor motor has accelerated and the maximum phase current has dropped below 85 percent of the chiller nameplate RLA for 1.5 seconds, the starter transition to the ‘‘Delta’’ configuration is initiated.

J. The transition contactor (2K4) is closed through relay 2A1-J2, placing the transition resistors (2R1, 2R2, and 2R3) in parallel with the compressor motor windings. The run relay (2A1- J6-3 to 1) is closed.

K. The shorting contactor (2K3) is opened through the opening of relay 2A1-J4 100 msec after the closure of the transition relay 2A1-J2, and the run relay 2A1-J6.

L. The run contactor (2K2) is closed through auxillary contacts on the shorting contactor (2K3), shorting out the transition resistors. This places the compressor motor in the ‘‘Delta’’ configuration and the starter module waits to look for this transition for about 2.3 seconds through the closure of the transition complete contacts 2K2-Aux at module 2A1-J12 input)

M. The starter module must now confirm closure of the transition complete contact (2K2-AUX) within

2.5seconds after the shorting relay (2A1-J4) is opened. Finally, the transition relay (2A1-J2) is opened de- energizing the transition contactor (2K4) and the compressor motor starting sequence is complete. An MMR diagnostic will be generated if the transition complete contacts (2K2- AUX) do not close. A diagram of this test or start sequence is shown in Figure 24.

64

CVHE-SVU01E-EN

Page 63 Page 65
Page 64
Image 64
Trane CVHE-SVU01E-ENX39640712050 manual Delay time 200 msec. Opens 2K1
Page 63 Page 65

CVHE-SVU01E-ENX39640712050 specifications

The Trane CVHE-SVU01E-ENX39640712050 is a high-efficiency centrifugal chiller designed for commercial and industrial applications. This state-of-the-art unit is engineered to provide reliable cooling performance, energy efficiency, and optimized operational flexibility. It is particularly suitable for large-scale facilities that require significant cooling capacity and robust performance under varying load conditions.

One of the most notable features of the CVHE-SVU01E series is its advanced variable speed drive technology. This technology enables the chiller to adjust its speed according to the cooling demands of the facility, resulting in substantial energy savings. By operating at optimal speeds, this unit reduces power consumption and enhances overall efficiency. This is noteworthy in the context of rising energy costs and increasing sustainability demands across various industries.

Moreover, the CVHE-SVU01E is equipped with Trane’s proprietary Compliant Scroll compressor technology. This innovative compressor design minimizes mechanical losses and increases the efficiency of the chiller system. Additionally, the compressor is specifically designed to handle varying refrigerant flow rates, allowing the chiller to maintain performance even when faced with fluctuating conditions.

Another significant characteristic of this chiller model is its use of environmentally friendly refrigerants, aligning with global regulations aimed at reducing greenhouse gas emissions. This commitment to sustainability ensures that the CVHE-SVU01E not only provides excellent cooling performance but also adheres to contemporary environmental standards.

The unit utilizes an advanced control system that simplifies operation and enhances troubleshooting capabilities. The intuitive interface allows facility managers to monitor performance metrics, optimize operation schedules, and conduct remote diagnostics, significantly reducing costly downtime and maintenance efforts.

Furthermore, the compact and modular design of the CVHE-SVU01E makes it easy to install in various settings. Its durability is ensured through the use of high-quality materials and components, designed to withstand the rigors of demanding environments. With reduced maintenance requirements, facility operators can focus on core business functions without frequent interruptions.

In summary, the Trane CVHE-SVU01E-ENX39640712050 combines cutting-edge technologies and features to deliver exceptional performance, efficiency, and reliability in commercial cooling applications. Its advanced design contributes to reduced energy costs, minimal environmental impact, and greater operational flexibility, making it an excellent choice for organizations seeking sustainable and efficient cooling solutions.
Top Page Image Contents