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Emerson VH, DE, VE, DH manual Troubleshooting, Blower troubleshooting, Chilled water troubleshooting

Models: VE DH VH DE

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Troubleshooting

8.0TROUBLESHOOTING

Use this section in troubleshooting your unit. Also refer to 6.0 - Alarm Descriptions and Solu- tions. Suggestions are grouped by product function for convenience.

! WARNING

Only qualified personnel should perform service on these units. Lethal voltage is present in some circuits. Use caution when troubleshooting with power on. Disconnect and lock out power before replacing components. Use caution and standard procedures when working with pressurized pipes and tubes.

! CAUTION

When using jumpers for troubleshooting, always remove jumpers when maintenance is complete. Jumpers left connected could override controls and cause equipment damage.

Table 21 Blower troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

 

No main power

Check L1, L2 and L3 for rated voltage.

 

 

 

 

Blown fuse or tripped circuit

Check fuses or CBs to main fan.

 

breaker (CB)

 

 

 

Overloads tripped

Push reset button on main fan overload. Check amp. draw.

 

 

 

Blower will not start

No output voltage from

Check for 24 VAC between P24-2 and P24-1. If no voltage,

 

transformer

check primary voltage.

 

Control fuse blown or circuit

Check for 24 VAC between P4-4 and E1. If no voltage,

 

breaker tripped

check for short. Replace fuse or reset circuit breaker.

 

Start switch SS not making

Jumper P9-1 to P9-2. Unit should start. If unit stops after

 

contact (SM only)

jumper is removed, replace S1.

 

 

Check for 24 VAC between P36-9 and P36-10. If voltage is

 

 

not present, R1 is not receiving power.

Blower runs but controls

Relay R1 not making contact

Check air switch. Jumper P36-4 to P36-7 If R1 closes, air

switch is not closing (check for blower rotation, loose wiring,

will not operate

(standard controls only)

and pinched tubing.) Remove jumper.

 

 

 

 

 

 

 

Check for 24 VAC at R1 coil. If the voltage is present and R1

 

 

is not pulling, replace R1.

Table 22 Chilled water troubleshooting

Symptom

Possible Causes

Check or Remedy

 

 

 

Actuator Motors

No 24 VAC power to motor

Check for 24 VAC between P22-3 and P22-5 (open), or P22-

1 and P22-5 (closed).

 

 

Chilled water or hot

Motor operates but valve won’t

Check linkage for adjustment and be sure that it is tight on

water/steam valve not

open

the valve.

opening

 

 

 

 

 

 

No 24 VAC power to motor

Check linkage for adjustment and be sure that it is tight on

 

the valve.

 

 

 

 

Check DC voltage on printed circuit board in motor. Terminal

 

 

No. 1 is grounded and No. 3 is positive. DC voltage should

 

No signal from control

vary from 0.8 to 2.0 VDC or above as temperature control is

Modulating Motors

 

varied below room temperature on cooling valve or above

 

 

room temperature on heating valve.

 

 

Remove wires on terminal No. 1 and No. 3 from the motor

 

Motor not working

(do not short). With 24 VAC power from TR to TR jumper

 

terminal 1 and 2 on motor to drive open. Remove jumper to

 

 

 

 

drive closed, if motor fails to work, replace it.

 

 

 

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Emerson VH Troubleshooting, Blower troubleshooting, Chilled water troubleshooting, Symptom Possible Cause Check or Remedy
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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.