Precision Zone specializes in Yaskawa product repairs servicing a wide range of AC inverters such as Yaskawa CIMR-F7 Series inverter.

Yaskawa’s F7 drive performance makes it the ideal drive for high performance speed, torque, or position control applications. The F7 allows motor operation at very long cable lengths, with peak voltage being 30% less than conventional. With motor bearing current being typically 50% less than standard inverters, the F7 provides four times the motor bearing life.

The LCD keypad/operator is equipped with local/remote functions, copy feature, 7 language choices, and 5 lines of display with 16 characters per line. User parameter settings can be recovered at any time via “user initialization” when enabled. Optional Drive Wizard software allows upload/download, as well as graphing and monitoring of Drive parameters from a PC for ease of Drive management.

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 CIMR-F7 SERIES INVERTER DRIVE

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 0.41 V for each phase
Multimeter Positive Lead L1 L2 L3
Multimeter Negative Lead Positive Side of the DC Buss
Diode Check Approximately 0.42 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 0.38 V for each phase
Multimeter Positive Lead Negative Side of the DC Buss
Multimeter Negative Lead U V W
Diode Check Approximately 0.37 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
GF Ground Fault
OC Over current
OL1 and OL2 Overload
RR Braking Transistor Shorted
ERR Control board hardware failure
UV Undervoltage
OV Overvoltage
OH and OH2 Overheat
OS Overspeed Detection
OPE Parameter Alarms
PF and PH Phase Loss or Open Phases

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





Recently Repaired Products

Yaskawa CIMR-F7U45P5 image CIMR-F7U45P5 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Capacitor(s), Bad Cooling Fans
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 5.5kW

Yaskawa CIMR-F7U2015 image CIMR-F7U2015 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Cooling Fans, Bad DCCT, Bad Gate Section/Board, Bad Output Transistors/SCRs
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 208-240V; 15kW

Yaskawa CIMR-F7U2011 image CIMR-F7U2011 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Circuit Board Component(s), Blown Input Power Components
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 208-240V; 11kW

Yaskawa CIMR-F7U4090 image CIMR-F7U4090 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Precharge Resistor
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 90kW

Yaskawa CIMR-F7A25P5 image CIMR-F7A25P5 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Cooling Fans, Bad Fuse, Bad Gate Section/Board, Bad Power Section/Board, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: AC Inverter Drive
Series: F7
Specification: A
Rated Input Voltage & Rated Motor Capacity: 208-240V; 5.5kW

Yaskawa CIMR-F7U2018 image CIMR-F7U2018 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Gate Section/Board, Bad Output Transistors/SCRs, Physical Damage to the Drive
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 208-240V; 18kW

Yaskawa CIMR-F7U4011 image CIMR-F7U4011 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Cooling Fans, Excessive Dirt/Debris, Leaky Capacitors (Open, Corroded Traces)
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 11kW

Yaskawa CIMR-F7U4018 image CIMR-F7U4018 is an
Inverter-General Purpose manufactured by Yaskawa
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 18kW

Yaskawa CIMR-F7U4045 image CIMR-F7U4045 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Fuse, Excessive Dirt/Debris, Bad Cooling Fans
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 45kW

Yaskawa CIMR-F7U4075 image CIMR-F7U4075 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Precharge Resistor, Excessive Dirt/Debris, Bad Regen Resistor/s
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 75kW

Yaskawa CIMR-F7U27P5 image CIMR-F7U27P5 is an
Inverter-General Purpose manufactured by Yaskawa
Discovered issues: Bad Circuit Board Component(s)
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 208-240V; 7.5kW

Yaskawa CIMR-F7U40P4 image CIMR-F7U40P4 is an
Inverter-General Purpose manufactured by Yaskawa
Drive Type: AC Inverter Drive
Series: F7
Specification: UL Specification
Rated Input Voltage & Rated Motor Capacity: 480V; 0.4kW