UPS 750 Uninterruptible Power Supply Caterpillar


Fuses (EXRC)

Usage:

UPS 750 AD2

Fuse Link



Illustration 1g06058213
Fuse-link

The 1000VAC fuse-link square body is arc resistant. If there is an event (short) in the Extended Runtime Cabinet (EXRC) or the FPU, the fuse-link protects the equipment from being damaged. All contact surfaces are silver plated and all hardware is non-magnetic. The fuse-link is equipped with a low voltage trip-indicator. This trip-indicator operates a microswitch which can be installed in the field.



Illustration 2g06058231
(1) Microswitch
(2) Mounting locations
(3) Square fuse link

Fuse Link Removal

Note: Always practice Electrostatic Discharge (ESD) prevention.

  1. Ensure that all pre-removal steps are performed for the Extended Runtime Cabinet (EXRC) before gaining access to internal components.

    Note: The system must be shut down before the removal steps can be performed.

  2. Remove 1/2 inch bolt and washers and nut on each side of the fuse link.

  3. Remove the fuse link from the EXRC.

  4. Remove the microswitch.

Fuse Link Installation

  1. Install the microswitch on the replacement fuse link.

  2. Install the replacement fuse link.

  3. Secure with the hardware removed earlier.

  4. Check all connections.

  5. Prepare the UPS and EXRC for operation.

  6. Return the system to service.

Microswitch



Illustration 3g06058260
Microswitch
(4) Blown fuse indicator

The PSC type microswitch is reset manually. When the fuse is blown, the indicator is pushed out. Refer to Illustration 3.

The fuse is replaced and the microswitch is installed on the replacement.

Fuse (750 VAC, 2000A)



Illustration 4g06058282

The fuse on the positive and negative buses prevents damage to the Extended Runtime Cabinet (EXRC) and connected equipment such as CSDCs and batteries.

Fuse (750 VAC) with Microswitch Remove and Replace



Illustration 5g06058339
(5) Microswitch
(6) Booster DC Cap Module (Right Side)
(7) Zinc Cap Bolts (4) 12x1
(8) Bus Negative I/O Link
(9) 750 VAC Fuse
(10) Negative Booster Input

Note: Always practice Electrostatic Discharge (ESD) prevention.

  1. Ensure that all pre-removal steps are performed for the EXRC before gaining access to internal components.

    Note: The system must be shut down before removal.

  2. Remove two (2) M12 x 1.75 (metric) bolts and washers and nut from each side of the fuse.

  3. Remove the fuse from the EXRC.

  4. Remove the microswitch.

  5. Install the microswitch on the replacement fuse link.

  6. Secure with the hardware removed earlier.

  7. Replace any other components removed earlier.

  8. Check all connections.

  9. Prepare the UPS and EXRC for operation.

  10. Return the system to service.

Switch



Illustration 6g06058314

The switch allows you to check the fuse state visually. The indicator tab extends when the fuse is blown. Refer to Illustration 6.

The indicator may be remounted on a new fuse with the indicator pushed in to show that the fuse is in a conductive state.

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