Repair
Repair Price: $ 1,108.00
Purchase
CSL Part Number: 70775
Product Overview: The Square D Life-Gard Model 85 is a microprocessor-based transformer temperature controller designed to monitor winding temperatures and automatically control cooling fans in power transformers. It accepts inputs from RTD or thermocouple sensors and provides relay outputs to activate cooling equipment at programmable temperature setpoints. The H150 configuration typically includes specific temperature trip points and display features. Common in utility substations and industrial power distribution systems, it uses EEPROM memory for configuration storage and features a front panel with digital display and DIP switch programming.
Category: Temperature Control
Manufacturer: Square D
Alternate Manufacturer Names: Life-Guard, lifegard, Schneider Electric
Manufacturer Part Number: 85 / H150
Series: Model 85 Transformer Fan Control
Brand: Life-Gard
Other Synonyms: Life-Guard, lifegard, Schneider Electric
Why replace your Life-Gard Fan Control System? Repair it at 1/4 the cost!
Common Failures
Common issues include defective electrolytic capacitors, EEPROM malfunctions, faulty relays, and DIP switches. In some cases, physical damage such as loose components, inadequate fuse setups, and broken card guides have been observed.
Repair Approach
The repair process typically involves replacing defective components, such as capacitors and EEPROMs, to address performance issues. For units with physical damage, relays may be secured and fuse arrangements corrected. Preventative measures may include replacing older capacitors to support long-term reliability.
Testing & Quality
After repairs, units undergo comprehensive burn-in testing with a load to verify proper functionality. Critical parameters, such as the ability of outputs to turn on and off at the correct temperatures, are verified. Tested units that pass our quality assessments are confirmed operational and ready for return to service.
Service and repair your broken Square D part
We can repair your Square D model 85 / H150 in our facility. Let our skilled technicians get your Square D back in operation quickly.
Step 1 - Click the green 'Repair Now' button above to add the part and then complete the RMA.
Step 2 - The RMA form will be sent to you via email. Print the RMA form and put it in a box with the item(s) for repair.
Step 3 - Ship or mail the box to the address listed on the RMA.
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