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Replacing the Internal Batteries in UNITY/I™
Models UT3K, UT4K, UT5K, and UT8K
This publication describes how to change the internal batteries in UNITY/I models UT3K, UT4K,
UT5K, and UT8K. This procedure is for units with the fuse board mounted below the front panel of
the unit. If the fuse board is inside the chassis, see BEST publication UTY 619. A qualified service
technician must perform this procedure.
If you have any questions or problems while performing this procedure, call BEST Power Worldwide
Service at 1-608-565-2100, or 1-800-356-5737 (U.S.A. and Canada), or call your local BEST office.
Replace batteries with the same series and type battery.
Tools Required (use insulated tools):
DC voltmeter
Phillips screwdriver
7/16" box wrench
Personal safety equipment required by local codes (also see the caution on pp. 2 - 3).
Contents
Important Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Section 100: Before Replacing the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Section 101: Powering Down the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 102: Using Battery Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . 5
Section 200: Removing the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Section 300: Replacing the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
© Copyright 1995, Best Power Technology, Inc.
UTY-0618B
7/16" nut driver
Diagonal cutters
1/4" nut driver
½" heat shrink tubing or electrical tape
UNITY/I User Manual
UTY 618
November 1995
RESTRICTED
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Related Manuals for Best Power UNITY/I UT3K
Summary of Contents for Best Power UNITY/I UT3K
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Page 1: Table Of Contents
If the fuse board is inside the chassis, see BEST publication UTY 619. A qualified service technician must perform this procedure. If you have any questions or problems while performing this procedure, call BEST Power Worldwide Service at 1-608-565-2100, or 1-800-356-5737 (U.S.A. and Canada), or call your local BEST office. -
Page 2: Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS! This publication contains important instructions that you should follow during battery replacement. CAUTION Full voltage and current are always present at the battery terminals. The batteries used in this system can produce dangerous voltages, extremely high currents, and a risk of electric shock. - Page 3 CAUTION 6. Make sure the fuse is positioned so that it will not contact any cabinet parts or other battery posts if the batteries move. Make sure there is enough clearance when the battery cabinet door closes. 7. If you are replacing batteries or repairing battery connections, follow the procedure in the UNITY/I User Manual to shut off the UPS and remove both AC and DC input power.
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Page 4: Section 100: Before Replacing The Batteries
Section 100: Before Replacing the Batteries . . . Before replacing the batteries in the UNITY/I UPS, you must do one of the following: Power down the UNITY/I UPS Enable the UNITY/I unit’s “battery maintenance mode.” Whenever possible, you should power down the UPS while servicing the batteries. However, you may use battery maintenance mode if necessary. -
Page 5: Section 101: Powering Down The Ups
Section 101: Powering Down the UPS IMPORTANT Before beginning, measure the voltage of each replacement battery. Each battery should measure at least 12 V. 101-1. If there is an external bypass switch, you may use it to bypass the UPS. Otherwise, shut down the load equipment. - Page 6 CAUTION When the unit is in battery maintenance mode (Parameter 63 set to “1”), there is still live voltage inside the UPS. Battery maintenance mode (Parameter 63 set to “1”) should be used during battery maintenance only. Do not use battery maintenance mode for any other type of UPS service or maintenance.
- Page 7 102-3. Enter the nominal AC input line voltage in Parameter 62 (Nominal Input Voltage) as follows: a. The display should show P-XX (where XX is a parameter number). Use the ] key or the [ ] key to change the display reading to P-62. LOAD VOUT Figure 1: Battery Maintenance Mode LEDs...
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Page 8: Section 200: Removing The Batteries
Section 200: Removing the Batteries IMPORTANT The steps in Sections 200 and 300 must be performed in order. 200-1. Remove the screws at the corners of the front ventilation panel and remove the panel from the unit. Also, remove the bottom narrow front panel(s). See Figure 2. NOTE: On a UT8K, also remove the front kick plate (found below the front ventilation panel);... - Page 9 Figure 3: Battery Tray, Front View 200-4. Use the two bolts to attach the battery tray handle to the battery tray at the front of the unit (see Figure 3). 200-5. Remove the bolt from the top DC connector. See Figure 3 for DC connector location. 200-6.
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Page 10: Section 300: Replacing The Batteries
CAUTION The battery tray will drop to the floor if it is completely removed from the unit. Make sure that your feet/hands are not under the battery tray while pulling the tray out of the unit. 200-11. Read the CAUTION above. Then, carefully pull the battery tray out of the unit just far enough to expose all of the battery terminals. - Page 11 300-5. If the unit has external batteries, connect the external battery cable (+) to the “+BATT” post at the top of the fuse board (see Figure 3). Reassemble in this order: cable, flat washer, split lock washer, nut or cable, flat washer, nut with attached star washer.
- Page 12 If the BYPASS LED is on, the unit is still in battery maintenance mode. Repeat steps “a” and “b” above. If the BYPASS LED remains lit, call BEST Power Worldwide Service for technical assistance. c. Press [ ] twice to escape parameter mode.