一、The equipment

Inverter model: V5-H-4T-3.7G/5.5L-H3

Motor nameplate: 380V, 2.2kW (1 unit), 4 poles, 5.0A, 1420r/min

380V, 1.5kW (2 units), 4 poles, 2.7A, 1420r/min

二、The application:

For elevators and traveling machines in the galvanizing industry, 3.7kW inverter controls 3 motors (with electromagnetic brake), 2.2kW for lifting, 2 pieces 1.5kW motors for left and right walking, The contactor in the output side of the inverter , the auxiliary contact of the contactor was used for the start signal of the frequency drive.

三、Commissioning parameters (non-factory parameters):

P0.06=1，P0.08=0.5，P0.09=0.5，P0.11=100，P0.13=90，P4.22=30，P4.23=65，P4.24=50,，P4.25=80，P5.00=2，P5.01=3，P5.02=09，P5.03=10，P5.04=11，P9.02=1420，P9.03=2.2，P9.04=5.2，P9.05=3.0，PA00=6，PA11=700，d000~d002=10，d003=565，d004=3.2，d005=9.5，d006=76，d007=34，d0.08=31.7，d009=219，d011=4.

四、Commissioning problems

When start commissioning, each fault was EFAL short-circuit type to ground, the control board was replaced, the fault still existed and the fault of the inverter not eliminated. Each fault was EFAL short-circuit type to ground. A situation was found on the scene: there were three V&T inverters on the site, and the motor wiring of the inverter that reported the fault was the longest. Since the fault was not eliminated after replacing the inverter, it means that our construction lifting inverter has no problem. But the reasons for the scene need to be found out.

Processing steps:

1. Check the fault record and find that the fault frequency d0.05 was not the given frequency during operation. It can be presumed that it was the fault reported during acceleration and deceleration, and the acceleration and deceleration time was 0.5s. The long-term acceleration and deceleration caused the motor to heat up. As a result, the insulation of the motor reduced, so the acceleration/deceleration time was increased by 1.5 s. It was observed that the fault has been reported for a long time, which proves that it was not the cause of the acceleration/deceleration time.

2. Since the inverter was replaced or the fault was reported, the problem was not in the inverter, and the carrier frequency was also changed. It was not possible to check the output line. It was found that the screw of the contactor was not tight, and there was a terminal for the motor. The screws slipped, and all the wires were tightened once. Operation did not report the fault until afternoon of the next day. It may be this reason. Of course, there may be interference factors. It was recommended that output end should be added with a magnetic ring, and the user accepts the suggestion, affirming that the quality of the inverter is good.