💡 Checking the display values:

• Provides benchmark values prior to isolating the load, which will then be re-recorded and compared to after the load is placed back on UPS supply.
• Provides benchmark values to compare against what the HMI is displaying.
• Helps us identify potential red flags at the beginning of the preventative maintenance procedure.

For example, Battery Operation Time measures how long the UPS has run on battery backup due to a loss in utility power. If the initial recording of total runtime is too high, our technicians will inform the customer and recommend they investigate why they’re losing utility power so often.

💡For all equipment inspections (UPS and peripherals alike), our technicians are checking for physical damage, debris, secure connections, cleanliness, noise, and proper ventilation. Thoroughly conducting these inspections can identify multiple trouble areas, such as potential parts replacements or environmental concerns that will impact safety and performance.  

For example, one of our customers had their UPS located in a dusty environment where the unit sat in the open on the floor and there was a lot of foot traffic.

During the UPS maintenance visit, one of our technicians noticed the environmental conditions and the built-up dust on the filter. He instructed the client to change the filter more often (at least once a month) because enough built-up dust would eventually cake the unit and create new paths to conduct electricity. It could even lead to arcing on the circuit board.

Battery Cabinet(s) Inspection

VRLA or Wet Cell

External

X

X

Internal

X

X

Control Circuit

X

Ambient Temperature

X

X

Charge Current

X

X

Ground Fault

X

Voltage, Resistance/Conductance

X

X

Data Log Download

X

X

Battery Cabinet(s) Inspection

Samsung Lithium-ion

External

X

X

Internal

X

X

Control Circuit

X

Ambient Temperature

X

X

Resistance

X

💡 Key metrics, such as ambient temperature, charge current, voltage, and resistance are strong indicators of the health of your UPS batteries (i.e., their ability to respond in the event of a utility power outage). For example, a battery with no voltage or no/high resistance are signs of a bad battery.

Especially for lead acid batteries where a monitoring system is not included with the battery, our technicians will download the data logs, review and trend the data, and give you insight into the current state of your batteries and a timeline for replacement.

What can it mean for your batteries when you don’t have a UPS annual maintenance contract? Read these stories.

UPS Input Voltage Checks

X

💡 Our technicians use state-of-the-art power quality meters to test the utility power coming into the facility, identifying any harmonics or signs of “dirty” power.

Current Sensor Gain

X

Record Set Up Values of UPS

X

💡 Our technicians will record the site's specific system values, especially prior to a software update as software updates return the system back to default values.

Software Verification

X

X

Peripheral Equipment Software Verification

X

X

💡Software updates are often overlooked, as the prevailing mindset has long been, "If it’s not broken, don’t fix it." However, these updates can provide significant benefits. For example, our software updates have introduced enhanced security measures, expanded timestamp capabilities for our internal metering and reporting systems, and added new functionalities designed to address challenges posed by a strained electrical grid and varying load demands.

Control Power Supply Check

X

Operational Checks

X

Transfer Test

X

AC Input Failure Test

X

EPO

X

Remote Operation Test

X

Remote Alarm Annunciator Test

X

💡This series of checks and tests is a critical element of Mitsubishi Electric’s uninterruptible power supply maintenance checklist. During this section, we not only ensure that your main board and power supply board are within specification, but we also simulate potentially catastrophic power quality scenarios to ensure our systems deliver 99.9995% equipment reliability.

Restore Load

X

Room Condition Check

X

X

Final Site Walk Through

X