38

Yes

 

 

 

 

 

Is there 24 Vac across 24 V

Secure wiring between 24 V

Verify external wiring

 

Output #8 on control board

No

input connection #8 on the No

diagrams, Does the pump

 

relay board?

and 24 V input connection

turn on?

 

#8 on relay board.

 

 

 

 

Yes

 

Troubleshooting

ROBERTS GORDON®

Yes

Replace plug-in relay.

No

Is the red LED on plug-in

See Replacement Parts

relay #8 on the relay board Yes

section.

 

lit?

 

 

Yes

Is there 120 V at output # 8

on the relay board?

No

Replace plug-in relay or

relay board. See

Replacement Parts section.

Refer to the VFD

manufacturer's Installation and Operation Manual to clear error.

Yes

 

Is there 120 V into 120 V

 

Yes

relay in the variable

Yes

 

frequency drive assembly.

 

 

No

 

 

Rectify wiring between

 

 

controller and 120 V relay.

 

Is there 120 V (230 V for

Is there continuity between output terminals on 120 V relay.

No

Replace 120 V relay. See Replacement Parts section.

Yes

Yes

Flow Chart (continued)

ULTRAVAC™ CONTROLLER INSTALLATION MANUAL

Yes

Is there continuity between VFD terminals 1 and 11?

No

Rectify wiring between 120 V relay and VFD terminals 1 and 11.

Check circuit breaker and

power supply.

No

Is there power (120 V or 230 V) between the rotary disconnect inputs?

Yes

Turn rotary disconnect switch to the ON position. See Section 6.1.

Yes

Is there power (120 V or 230 V) between the rotary disconnect outputs?

Yes

Is the LCD display

Yes

of the VFD on?

 

 

No

Is there power (120 V or

230 V) between L1 and Yes L2/N inputs on the VFD?

No

Is there power (120 V or

230 V) between fuse Yes holder outputs?

 

No

 

No

Is there power (120 V or

Yes

 

230 V) between fuse

 

 

holder inputs?

 

No

Replace rotary disconnect

base block.

 

Is there an error showing

on the LED display?

Replace VFD. See

Replacement Parts

section.

Rectify wiring between fuse

holder outputs and VFD power inputs L1 and L2/N

Replace fuse. See

Replacement Parts

section.

460 V models) between any No two output (motor) terminals No

(U,V or W)? Yes

Is there power between any

two input wires at the No pump?

Yes

Is the pump motor hot?

Yes

No

Disconnect power to the motor. Does the motor shaft turn freely?

No

Is the pump impeller

obstructed?

No

Motor bearings may have failed. Repace motor.

Replace VFD. See

Replacement Parts

section.

Rectify wiring between

VFD and pump.

Motor may have tripped

overload. Wait 10-15 minutes and reset.

Page 44
Image 44
Roberts Gorden NEMA 4 installation manual Flow Chart, Troubleshooting

NEMA 4 specifications

The Roberts Gordon NEMA 4 is a leading example of industrial heating technology, specifically designed for demanding environments. Known for its ruggedness and efficiency, it meets the needs of various industries, including manufacturing, warehousing, and food processing. The robust design ensures that it can operate efficiently in harsh conditions, making it a popular choice for facilities where moisture, dust, and other contaminants are common.

One of the standout features of the Roberts Gordon NEMA 4 is its weatherproof and dust-tight enclosure, which adheres to the NEMA 4 classification. This means that the unit can withstand water splashes and rain, making it suitable for outdoor installations or areas where water exposure is likely. The housing is constructed from durable materials that resist corrosion, ensuring longevity and reliability.

In terms of technology, the Roberts Gordon NEMA 4 utilizes advanced infrared heating, which provides direct and efficient heat transfer. This type of heating warms objects and surfaces rather than the surrounding air, allowing for faster heat-up times and enhanced energy efficiency. The units are equipped with high-output infrared emitters, which are designed to maximize radiant heat output while minimizing energy consumption.

The operational characteristics of the Roberts Gordon NEMA 4 are also noteworthy. The units are designed to be user-friendly, featuring intuitive controls that allow for easy temperature adjustments and monitoring. Furthermore, they come equipped with automatic safety features, including over-temperature protection and fail-safe shutdown mechanisms, which enhance operational safety.

Another advantage of the Roberts Gordon NEMA 4 is its versatility. It can be configured for various applications, including ceiling-mounted installations or wall-mounted setups, depending on the specific heating needs of a facility. This adaptability allows for efficient space utilization in warehouses and production areas.

The energy efficiency of the Roberts Gordon NEMA 4 translates into cost savings for businesses. By providing targeted heating where it is needed most, the units help reduce overall energy expenditures. Additionally, the longevity of the unit minimizes the frequency of replacements, contributing to long-term value.

In summary, the Roberts Gordon NEMA 4 is a highly effective industrial heating solution characterized by its robust design, advanced infrared technology, versatility, and energy efficiency. It is well-suited for challenging environments and has been embraced by industries that demand reliable and efficient heating solutions.