Electrical Insulation Testing

maintenance

Why perform electrical insulation testing?

Electrical insulation starts to age as soon as it's made. Harsh environments, especially those with extreme temperature changes and/or chemical contamination, cause further deterioration of the insulation (power cord).

As a result, personnel safety (electrocution/shock) and power reliability can suffer resulting in higher operating cost and maintenance.

What is Insulation Resistance Testing

Insulation resistance testing applies a regulated stabilized high voltage (Figure 22), typically 500 VDC or greater across a dielectric (power cord). Measuring the amount of leakage current flowing through the dielectric will yeild a resistive measurement in megohms.

Insulating Material Testing

To verify the integrity of the pump's insulating material (power cable) it will be necessary to perform an electrical insulation test. Any electrical insulation must have the opposite characteristic as the conductor: it should resist the flow of current, keeping it within the conductor.

To measure the IR (current x resistance), the use of an IR tester must be employed.This IR tester is a portable device that is a resistance meter (ohmmeter) with a built in DC generator that develops a high DC voltage.

The high DC voltage from the IR tester is usually 500 VDC or more.This voltage, when applied causes a small current to flow through and over the insulation's surfaces.The tester provides a direct reading of IR in megohms.

Ahigh resistance reading would indicate a "good" insulation, meaning very little current is escaping through the insulation. While a relatively low resistance reading would indicate poor insulation, meaning a significant amount of current may be leaking through and along the insulation.

NOTICE

Insulation resistance is moisture and temperature sensitive. When temperature increases, insulation resistance decreases, and vice versa.

When performing this test measurement, perfom the test using the same test parameters as used in the initial testing.

20M		POWER CABLE
		INSULATION
M
	V
OFF
		GROUND
	K SET	GROUND
	K SET	PIN
	UP	PIN

MEGGER™

500 VDC INSULATION

TEST METER

SUBMERSIBLE

PUMP

PX400

Figure 22. Insulation Tester Application

DANGER

Read and follow the manufacturer's users manual prior to operating insulation tester (megaohm meter). This meter generates a test voltage of 500 volts or greater. Only qualified and trained personnel should

use this equipment. The possibility exists of severe electrical shock, electrocution even death!, when using insulation tester.

cx400/px400 Sub. pump • operation and parts manual — rev. #1 (12/03/10) — page 23

px400, cx400 specifications

The Multiquip CX400 and PX400 are cutting-edge equipment designed to make tasks in construction and landscaping more efficient and effective. These models are well-regarded for their reliability, durability, and advanced features, making them suitable for a wide range of applications.

The CX400 is known for its robust construction and powerful performance. It features a heavy-duty frame, which provides excellent stability during operation. The model is equipped with a reliable engine that ensures high torque and performance, allowing it to tackle various tasks with ease. Additionally, the CX400 boasts advanced hydraulic systems that enhance its lifting capacity and operational efficiency, making it ideal for heavy lifting and material handling in various environments.

On the other hand, the PX400 is designed for versatility and efficiency. This model is particularly well-suited for urban applications and tighter spaces due to its compact design. Despite its smaller size, the PX400 doesn't compromise on power. It offers an impressive lifting capacity and is equipped with a smooth-operating hydraulic system that allows for precise control during operation.

Both models come with user-friendly controls that simplify operation and increase productivity. The ergonomic design of the operator’s platform ensures comfort during extended use. Additionally, these machines feature enhanced safety features, including a robust guarding system and emergency stop functions, ensuring the safety of operators and personnel on job sites.

Another notable characteristic of the CX400 and PX400 is their fuel efficiency. Designed with modern engines that minimize fuel consumption while maximizing output, these models can significantly reduce operational costs over time. They are also engineered for easy maintenance, featuring accessible components that make routine checks and servicing straightforward.

Moreover, the Multiquip CX400 and PX400 are compatible with various attachments, allowing users to customize their machines for specific tasks. This adaptability makes them an invaluable asset to contractors and equipment rental companies alike.

In conclusion, the Multiquip CX400 and PX400 stand out in the construction and landscaping industry due to their powerful performance, advanced technologies, user-friendly features, and versatility. They are engineered to meet the demands of modern job sites while ensuring safety, efficiency, and reliability. Whether for heavy lifting or operating in confined spaces, these machines are equipped to handle a range of tasks effectively.