gps故障分析（GPS fault analysis）.doc

gps故障分析(GPS fault analysis)
MITSUBISHI GPS fault 1
Elevator fault case analysis 01
Fault phenomenon:
A hospital two MITSUBISHI GPS-I elevator, when there is a call, in an elevator group control in response to the call, the call is not disannul, only another elevator also in response to the call, just eliminate no.. That is to say, for any one call, two sets of elevator group control to each response time.
Treatment process:
1. of the software in the elevator floor setting, single ladder / group set for inspection, found no problem;
2. check the outside call wiring, wiring correctly.
3. disconnect the group control power supply, and then disconnect the main power supply of one of the elevators, then another elevator runs normally.
4. disconnect the group control panel power supply, for any one call, two elevators have to respond once.
5. through the above detection, it can be concluded that the independent operation of the two elevators is normal, the problem should be in the group control part or group control munication of each single ladder;
6. to puter board detection (or replacement), found no problem;
7. fiber optic cable inspection found that two parts of the fiber length is bundled on the frame of the control , bending part of the arc is too small. The replacement of two optical munication cable, the elevator back to normal.
This case heuristic:
In this case, two elevators share a set of outside call signals, that is, the outside call signal is a set of buttons, two sets of display forms. The outside calling signal is to enter the P1 puter board of the two elevators respectively, and municate with the group puter board through the optical fiber cable. munication fails, two elevator is actually running alone. And because the two elevators share a set of outside call buttons, so passengers feel that each outside call signal, the two elevators should be a response respectively.
In this case, the correct use of fiber optic cable to.
2006-2-22 12: