Multiquip ST41460 Benutzerhandbuch

If an installed pump (immersed in water) has not been in 
operation for a long period of time, check the insulation resistance 
and run the pump for 30 minutes every month.
If the pump cannot be run due to lack of water in the tank inspect 
the pump and turn the impeller by hand each month and prior 
to putting the pump back into service. If insulation drops below 
10 megohms, contact an authorized Multiquip service center. 

Electrical insulation starts to age as soon as it is 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.

Insulation resistance testing applies a regulated stabilized 
high voltage (Figure 19), typically 500 VDC or greater across 
a dielectric (power cord). Measuring the amount of 

current flowing through the dielectric will yield a resistive 
measurement in megohms.

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.
A high resistance reading would indicate a "

good" insulation, 

meaning very little current is escaping through

 the insulation. 

While a relatively low resistance reading would indicate a 

poor insulation, meaning a significant amount of current 

may be leaking through and along the insulation.

1. 

Area must be free from excessive humidity, corrosive gases, 

vapors or vibrations which might damage the pump.

2. 

Store pump in a vertical position on a pallet or stand.

3. 

Coil up the cable, and seal the open end (control box 

wires) with waterproof tape or a cable cap. This will prevent 

moisture from penetrating into the motor which could cause 

severe damage to the windings.

4. 

Give all unpainted surfaces a light coat of oil or grease to 

prevent corrosion.

5. 

If new pumps are stored for more than two months, turn 

the impeller by hand every two months to prevent the 

mechanical seal faces from seizing up. Failure to do this 

may result in seal damage when the pump is started.

Insulation resistance is moisture and temperature 

sensitive. When temperature increases, insulation 

resistance decreases, and vice versa.
When performing this test measurement, perform the 

test using the same test parameters as used in the 

initial testing. Contact an authorized Multiquip service 

center if the measured cable insulation is 

or less. 

V

OFF

20M

MEGGER™

SET

UP

M

K

GROUND WIRE

(GREEN)

500 VDC INSULATION

TEST METER

POWER CABLE

INSULATION

Read and follow the manufacturer's user's 

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.