Advanced Microprocessor with Graphics Control Setup

4.7.1Setup Operation

The SETUP OPERATION menu permits the review and/or adjustment of the unit configuration. This may include:

Cold Start Delay

This feature, also referred to as Positive Start or Winter Start Kit, allows for the low pressure switch to be ignored for the programmed time during a cold start of the compressor. Entering a “0” for this time will bypass this feature. A “1”, will bypass the low pressure switch for one minute, a “2” for two minutes, etc. The programmed value can be from 0 to 3 minutes. This delay is factory set to 0 for water cooled, glycol-cooled, and GLYCOOLunits. Typically, only air cooled units need a “Winter Start” time.

Auto Restart Delay

This feature allows for the unit to restart automatically after a loss of power. The programmed value is .1 minute (6 seconds) intervals. A programmed value of zero (0) would require the user to manually press the ON/OFF switch to start the unit, i.e. no auto restart. The purpose of this feature is to pre- vent several units from starting at the same time after a loss of power. The message “Restart delay -- Please wait” will be displayed when the system is in the AUTO RESTART mode. (It is suggested mul- tiple unit installations be programmed with different auto restart times.)

IR Flush Overfill (infrared humidifiers only)

An autoflush system automatically controls a water makeup valve to maintain proper level in the infrared humidifier water pan during humidifier operation. If humidification is needed and 15 hours have elapsed since the last time the humidifier was on, then the humidifier is held off until the valve completes an initial fill of the humidifier pan. This pre-fill is about 30 seconds. The valve continues to fill and flush the pan for about 4 minutes.

During humidifier operation, with the flush rate set at the default of 150%, the valve is opened peri- odically to add water to the pan (about 40 seconds every 9 and 1/2 minutes of humidifier operation). This adds enough water to the pan to cause about a third of the total water used to be flushed out the overflow standpipe located in the humidifier pan. This action helps to remove solids from the pan. The flush rate is adjustable from 110% to 500%. If the water quality is poor, it may be desirable to increase the water flushing action above the normal 150% rate. Also, if the supply water pressure is low, the flush rate adjustment can be increased so that sufficient water level is maintained during humidification.

Chilled Water/Hot Water/Econ-O-Coil Flush

This feature will flush the respective coil for three (3) minutes after the programmed number of hours of nonuse. For example, if the flush time is programmed with 24 hours on a hot water reheat type system, and heating is not required for a 24 hour period, the hot water valve will be opened for 3 minutes to allow the coil to be flushed. The programmed value can be from 0 (no flush) to 99 (99 hours of nonuse).

Display in Degrees

The control can be set to display readings and setpoints in either degrees Fahrenheit (F) or Celsius (C).

Default Settings and Ranges

See Table 9 below for the list of setup functions, their factory default values and the allowable ranges for which they can be programmed.

Table 9 Setup functions and factory default values

Function

Default

Range

 

 

 

Cold Start Time Delay*

3

0 to 3 min (0 = no delay)

Restart Time Delay

0.1

0 to 9.9 min (0 =manual restart)

Infrared Fill Rate

150

110 to 500%

Chilled/Hot Water

24

0 to 99 hrs (also Econ-o-coil)

Coil Flush

 

 

F/C Degrees

F

C or F

*Factory set to 0 for water-cooled, glycol, and GLYCOOL units.

24

Page 32
Image 32
Emerson VH, DE, VE, DH Cold Start Delay, Auto Restart Delay, IR Flush Overfill infrared humidifiers only, Display in Degrees

VE, DH, VH, DE specifications

Emerson is a well-known brand in the field of automation solutions, offering a range of products that cater to various industries. Among its diverse portfolio, Emerson’s products like DE (Digital Electronics), VH (Variable Frequency Drives), DH (Distributed Control Systems), and VE (Valve Positioners) stand out for their advanced features, cutting-edge technologies, and unique characteristics.

Digital Electronics (DE) from Emerson represents the backbone of modern automation systems. These devices are characterized by their highly reliable digital communication capabilities, providing robust solutions for process monitoring and control. DE products integrate seamlessly with various automation platforms, allowing for easy data exchange and system interoperability. The advanced analytics embedded in these systems enable predictive maintenance strategies, enhancing overall operational efficiency.

Variable Frequency Drives (VH) are integral to motor control technologies, maximizing energy efficiency in various applications. Emerson's VH drives are designed for flexibility, supporting multiple motor types and configurations. These drives utilize pulse width modulation (PWM) technology, allowing for precise speed control and improved application performance. Their built-in protection features help extend motor life, prevent downtime, and reduce maintenance costs. Furthermore, the user-friendly interfaces of VH drives facilitate quick setup and troubleshooting.

Distributed Control Systems (DH) from Emerson provide a holistic approach to managing complex industrial processes. They enable centralized control while ensuring that local operations continue seamlessly. DH systems are characterized by their modular architecture, making them highly scalable and adaptable to changing operational needs. Advanced control algorithms within these systems help optimize processes, ensuring maximum productivity. Additionally, their enhanced cybersecurity features protect critical industrial operations from potential threats.

Emerson's Valve Positioners (VE) play a crucial role in regulating flow and pressure in various processes. These devices provide precise positioning capabilities, enhancing the performance of control valves. The VE systems incorporate smart technologies such as adaptive control and diagnostics, allowing them to self-tune and deliver accurate performance over time. Their compact design and robust build ensure they operate effectively in challenging environments.

In summary, Emerson's DE, VH, DH, and VE offerings embody the latest innovations in automation technology. Their main features, including digital communication, energy efficiency, scalability, and precision control, cater to the diverse demands of modern industries. With these products, Emerson not only enhances operational efficiency but also paves the way for intelligent automation solutions that are crucial for the future of industrial processes.