PLUG 6V9508 - Caterpillar

CONFIDENTIAL TIBU4055-00
TECHNICAL INFORMATION BULLETIN February 11, 2004
Uninterruptible Power Supply UPS 300 (CNJ, CPZ)
UPS 301 (CSY)
UPS 600 (CTX)
UPS 900 (CRY)
UPS 250 (APZ, CNM, BEE)
UPS 500 (CSE)
UPS 750 (CPM)
Component Codes: 4480SUBJECT: Circuit Breaker Set Points for SMS and MMS Configurations
PROBLEM: In order to assist the UPS commissioning field technician, the following document provides the correct set points for the various circuit breakers located in the UPS system.
: Personal injury or death can result from high voltage.
When the flywheel is spinning, the following components are energized: the bus, the armature leads, and the flywheel armature fuses.
High voltage and current are present when the Uninterruptible Power Supply (UPS) equipment is in operation.
Improper test equipment can cause a high voltage shock hazard to the user.
Make sure that testing equipment is designed for and correctly operated during high voltage and high current testing.
When servicing or repairing UPS equipment, make sure all capacitors are discharged.
Ensure that you have de-energized the UPS and the flywheel RPM is zero prior to performing these installation procedures.
Reference: For additional operational instructions and procedures, refer to the following publications:
RENR2476, Systems Operations, Testing and Adjusting, "UPS250, UPS300, UPS500, UPS750, and UPS900 Uninterruptible Power Supply"
SEBU7464, Operation and Maintenance Manual, "UPS250, UPS300, UPS500, UPS600, UPS750, and UPS900 Uninterruptible Power Supply"
SOLUTION: Effective on CAT UPS 250I/300 Series product, each circuit breaker application and location is identified in Table 1.
Table 1.
Circuit Breakers
Application Location
SMS ? 4 Wire Systems Zig Zag CBK ? Side Cabinet
MMS ? 4 Wire Systems Zig Zag CBK ? System Cabinet
MMS ? All Systems Motor Operator Bypass (CBP) ? System Cabinet
MMS ? All Systems Bypass Isolation Switch (BIS) ? I/O Cabinet
MMS ? All Systems Maintenance Bypass Switch (MBS) ? I/O CabinetThe required set points for the circuit breakers listed in Table 1 are listed in Table 2.
Table 2.
Circuit Breaker Set Points
Circuit Breakers (CBP, BIS, MBS)(MMS Only)
Long Time (L) I1=1 t1 = 18
Short Time (S) I2=10 t2=0.5 SW3=I>I2
Instantaneous (I) I3 = OFF
Control Switches Manual 50%
Zig Zag Circuit Breakers (SMS & MMS)
(If equipped with dip switches)
Long Time (L) I1=0.7 t1=18
Short Time (S) I2=OFF t2=0.5 SW3=I>I2
Instantaneous (I) I3=6
Control Switches Manual 50%
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