Precision Zone specializes in Magnetek product repairs servicing a wide range of AC Crane Inverters such as Magnetek Impulse P3 Series 2.

The Impulse P3 Series 2 is a unique hardware and software configuration specifically designed for applications to crane, hoist and monorail systems. It represents an advanced Variable Frequency Drive that allow for easily made modifications and adjustments. This product is the direct result of Magnetek’s expertise in designing and manufacturing Variable Frequency Drives.

The Impulse P3 Series 2 drive is the upgrade to the Series 1 of Electromotive Systems drives, providing compact and economical crane control. The drive offers a unique option in maintaining the look and feel of the original Impulse P3 drive and utilizing the expanded capabilities of the Impulse P3 Series 2 drive. As a default setting from the factory, Impulse P3 Series 2 programming and operation remains identical to the original Impulse P3 Series 1 drive, providing as easy transition from the original Impulse P3 Series 1 to the Impulse P3 Series 2.

When assessing the functionality of a drive, our engineering team typically conducts a four-step check:

• Visual Overview Check
• Static Test
• Checks Under Power
• Alarm Codes Verification

This overview is Precision Zone’s basic troubleshooting process. Once our repair team starts on the job we use specialized, customized test fixtures, Huntron tracker, signal generator, oscilloscope, milli and mega ohm meters and other necessary tools to assure quality repair. Most importantly, every repair is fully tested in custom-built simulators under load to replicate real-life working environment. Precision Zone goes as far as using heat chamber and overnight dynamic testing to guarantee performance of the repaired product when it comes back to the customer.

REPAIR PROCESS FOR IMPULSE P3 SERIES 2 AC CRANE INVERTER

Visual Overview Check

When conducting a visual check, the technician inspects the drive for any mechanical damage to the drive and print circuit boards. Then the team proceeds to verify connections are tight and correct inside the drive and there are no loose screws, wires or particles. Additionally, we look for any burn marks anywhere on the components or chassis. During the visual inspection technical team notes excessive dirt on cooling components and records clogged heatsink.

Static Test Basic

Precision Zone repair technicians use digital multimeter with diode testing capabilities and resistance measurement to conduct a static test. In the instance of Diode testing, our team is looking to check input and output modules.

Using your digital multimeter check the DC buss and make sure the DC buss has been discharged.

Input Modules Testing

Multimeter Positive Lead	Negative Side of the DC Bus
Multimeter Negative Lead	L1 L2 L3
Diode Check	Approximately 0.2-1.0 V for each phase

Multimeter Positive Lead	L1 L2 L3
Multimeter Negative Lead	Positive Side of the DC Buss
Diode Check	Approximately 0.2-1.0 V for each phase

Output Modules Testing

Multimeter Positive Lead	U V W
Multimeter Negative Lead	Positive Side of the DC Buss
Diode Check	Approximately 0.2-1.0 V for each phase

Multimeter Positive Lead	Negative Side of the DC Buss
Multimeter Negative Lead	U V W
Diode Check	Approximately 0.2-1.0 V for each phase

We verify capacitor value using capacitor meter and examine functionality of circuit breakers and contactors in the drive.

Alarm Codes Troubleshooting

The alarms on the drive are displayed through digital operator located on the front of the inverter. The codes displayed are:

Alarm Code	Code Type
Uv	Undervoltage
OV	Overvoltage
oH	Overheat
oC	Overcurrent
GF	Ground Fault
PF	Input Phase Loss
LF	Output Phase Loss

The majority of these alarms can be triggered if there is a fault in the control circuit.