1. The load fuse detection cable (red line in the following figure) is connected between the load and the circuit breaker (fuse). A load fuse blown alarm is generated based on the pressure difference between the load and the negative busbar RTN–. This alarm is generated when the pressure difference is greater than 04 V.
Notes: (1) If no load is connected, no alarm is generated regardless of whether the circuit breaker (fuse) is faulty. (2) The branch that generates the alarm needs to be connected to the load.
2. Based on the preceding analysis, perform the following steps after the load fuse is blown:
(1) Locate the branch connected to the load.
(2) If the load is normal, the circuit breaker (fuse) is normal. Check whether the monitoring cable (red line in the preceding figure) is securely connected.
(3) If the load has no power input, the circuit breaker (fuse) is not closed or faulty.