Unipower ARR-M Series

Questions and Answers

J
Julie WoodAug 17, 2025
Why does the AC breaker trip on my Unipower ARR-M?
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  Kimberly PowellAug 17, 2025
  If the AC breaker trips in your Unipower Battery Charger, it could be due to a short circuit. Check for shorts from input to output connections. Also, it could be due to an SCR, diode, or control board failure, so replace the defective component.
A
Anthony AllenAug 21, 2025
What to do if the DC fuse blows or DC breaker trips on my Unipower ARR-M?
- R
  Ryan FloresAug 21, 2025
  If the DC fuse blows or the DC breaker trips in your Unipower Battery Charger, it could be due to several reasons: - Freewheeling diode failure: Check the freewheeling diode for a short circuit. - Control board failure: Replace the control board. - SCR module failure: Verify SCR modules and replace if needed. - Battery connections reversed: Verify the polarity of battery connections. - DC filter failure: Check for a shorted DC filter capacitor.
P
pricepatriciaAug 25, 2025
Why does my Unipower Battery Charger have a high ripple voltage?
- M
  Ms. Tonya ClarkAug 26, 2025
  High ripple voltage in your Unipower Battery Charger can occur due to: - High AC line voltage: Read the input voltage and rectify the problem. Verify that the AC supply is of correct voltage and frequency. - Defective filter capacitor: Disconnect the capacitor(s) to observe any change in the output voltage ripple. Replace capacitor(s) if needed. - SCR, diode, or control board failure: Replace the defective component.
J
Jean ThorntonAug 28, 2025
What causes the low voltage alarm on my Unipower ARR-M Battery Charger?
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  Kevin RodriguezAug 28, 2025
  A low voltage alarm on your Unipower Battery Charger may be triggered by: - Charger overload: Check if the charger is in the current limit mode and inspect the load for issues. - AC input failure: Verify that the AC supply is of the correct voltage and frequency. - Float, equalize, and/or low voltage alarm adjustments affected: Refer to the adjustment procedures to reset.
O
Olivia BrownSep 1, 2025
Why is my Unipower ARR-M Battery Charger making abnormal noise?
- R
  Rebecca BarnesSep 1, 2025
  Abnormal noise in your Unipower Battery Charger can be caused by: - SCR firing circuit problem: Check if all LEDs on the control board are ON: One LED blinking, 2 solid for 1Phase system and 6 solid for 3Phase system. - Unbalanced current at the AC Input / Output of the power transformer: Check if the current is balanced at the input and the output of the power transformer. - SCR module failure: Verify SCR modules and replace if needed. - Control board failure: Replace the control board.
S
Shannon WatkinsSep 5, 2025
What causes high output current in my Unipower ARR-M Battery Charger?
- C
  Cory SmithSep 5, 2025
  High output current in your Unipower Battery Charger can be attributed to: - Improperly set float and/or equalize current limits: Refer to the adjustment procedures to reset. - Shunt signal problem: Check the shunt signal connection to the control board. - Affected calibration: Check with an external ammeter and compare the reading with the current value on the display.
T
Todd AlexanderSep 8, 2025
Why does my Unipower ARR-M have low output current?
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  Mr. Hunter NashSep 8, 2025
  Low output current in your Unipower Battery Charger can be caused by: - Improperly set float and/or equalize current limits: Refer to the adjustment procedures to reset. - Affected calibration: Check with an external ammeter and compare the reading with the current value on the display. - Loose connection: Check power wiring for loose connections.
D
Derek BautistaNov 12, 2025
What to do if my Unipower ARR-M has no DC output?
- R
  Robert HartNov 12, 2025
  If your Unipower Battery Charger has no DC output, several factors could be responsible: - A.C. breaker might be open. Verify that the AC breaker is closed and check for AC voltage on both sides of the breaker. - There might be an AC input failure. Verify that the AC supply is of the correct voltage and frequency. - The DC fuse might be blown. Verify the DC output fuse. - There might be an open blocking diode. Check the blocking diode. - There might be an open or loose connection. Check all wiring from input to output for open or loose connections. - There might be a control board failure. Replace the control board. - There might be an SCR module failure. Verify SCR modules and replace if needed. - It can be a High Voltage Shutdown alarm. Turn OFF the AC and DC breakers for 5 minutes then...

Summary

PART - 1: INSTALLATION

1. INTRODUCTION

Overview of the manual's purpose and target audience.

2. IMPORTANT SAFETY INSTRUCTIONS

Crucial safety precautions for operating the equipment.

3. STORAGE; MAINTENANCE DURING STORAGE

Guidelines for storing the charger/rectifier.

4. PLACEMENT AND INSTALLATION

Instructions for proper physical installation and location.

5. VENTILATION AND COOLING

Requirements for airflow and temperature for optimal performance.

6. ELECTRICAL CONNECTIONS AND WIRING

Procedures for safe and correct electrical hookups.

7. POWERING UP

Steps to safely turn on the charger after installation.

8. SYSTEM POWERING OFF PROCEDURE

Steps to safely shut down the charger and related systems.

PART - 2: THEORY OF OPERATION

1. THEORY OF OPERATION

Explanation of how the battery charger functions.

2. ACCESSING MENU VIA KEYPAD

Guide to navigating the charger's interface using the keypad.

3. CHARGING MODES

Description of different operational modes like Float and Equalize.

4. MANUAL ACTIVATION OF EQUALIZE OR FLOAT MODE

How to manually initiate specific charging modes.

5. AC INPUT VOLTAGE(S) AND CURRENT(S) (OPTIONAL)

Details on monitoring AC power input.

6. BATTERY CURRENT (OPTIONAL)

Information on monitoring battery current flow.

7. MENU AND CONFIGURATION PARAMETERS

Overview of adjustable settings and system parameters.

8. CURRENT TEMPERATURE COMPENSATION OUTPUT CURRENT DERATING (OPTIONAL)

How temperature affects output current.

9. REMOTE SENSING

Explanation of how to monitor voltage at battery terminals.

10. TROUBLESHOOTING

Guidance for diagnosing and resolving operational issues.

11. REGULAR PREVENTIVE MAINTENANCE

Schedule and actions for routine system upkeep.