Service manual

www.enc.net.cn/en Tel/Fax:[phone] Detailed function description
107
Fig.6-38 electronic thermal relay protection Fig.6-39 overload alarm
If output current exceeds electric level set by parameter F9.05 continuously，
open collector outputs effective signal(refer to Fig.6-39 and interrelated
description of parameter F5.10~F5.13) after delay time set by F9.06 passed.
0: banned
1: allowed
Actual descending rate of motor speed may be lower than that of output
frequency due to effect from load inertia when the inverter is in decelerating run
process, here the motor will feed electric energy back to inverter which will make
DC bus-bar voltage of the inverter increase, overvoltage protection will takes
place if not take steps.
Overvoltage stall protection function,
indicates that output frequency of the
inverter stops descending if bus-bar
voltage detected during run process
exceed stall voltage point defined by
F9.08 (relative to standard bus-bar
voltage) and the inverter continue to
implement decelerating run when
bus-bar voltage detected again is lower
than stall overvoltage point. As shown
in Fig. 6-40.
F9.05
Overload warning alarm
checkout level
Range: 20－200(%)
130(%)
F9.06
Overload warning alarm delay
time
Range: 0.0－20.0S
5.0S
time
current
[F9.04]=100%
[F9.04]=50%
1minute
55%
110%
105%
150% (G)
120% (P)
time
Alarm level
[
F9.05
]
Output current
high
high
Yn
[F9.06]
[F9.06]
F9.07 Overvoltage stall selection Range: 0, 1 1
F9.08 Overvoltage stall point Range: 120-150(%) 130(%)
time
time
stall overvoltage
point
out
p
ut fre
q
.
Fig.6-40 overvoltage stall function