15
6
7
15
KEB COMBIVERT F5
Name: Basis
04.05.04
6
Abschnitt
Seite
Datum
©
KEB Antriebstechnik, 2002
All rights reserved
Kapitel
Functional Description
Protective Functions
6.7.8
Motor Protection
Mode
The motor protective function protects the connected motor against thermal
desctruction caused by high currents. The function corresponds largely to mechanical
motor protective components, additionally the influence of the motor speed on the
cooling of the motor is taken into consideration. The load of the motor is calculated
from the measured apparent current (ru.15) and the adjusted rated motor current
(dr.12).
For motors with separately driven fan or at rated frequency of a self-ventilated motor
following tripping times (VDE 0660, Part 104) apply:
1,2
•
I
n
⇒
2 hours
1,5
•
I
n
⇒
2 minutes
2
•
I
n
⇒
1 minute
8
•
I
n
⇒
5 seconds
Fig. 6.7.8.a Motor protection mode
dr.11
Electronic motor protection
0
Separate cooling
1
Self-cooling
ru.15
Apparent current
dr.12
Motor protect. rated current
0.1…460.0 A
fr.8
Motor set assignemet
0
Counter 0
1
Counter 1
2
Counter 2
3
Counter 3
4
Counter 4
5
Counter 5
6
Counter 6
7
Counter 7
Parameter set selection
see Chapt. 6.8
Pn.14
Motor protect. function response
0...6 (see Chapt. 6.7.6)
⇓
⇓
⇓
⇓
⇓
⇓
If several motors are operated on one inverter, each motor can be individually protected
by selecting different counters (0...7).
Example:- a different counter is assigned to each motor
1. Motor
2. Motor
3. Motor
⇓
⇓
⇓
Counter 0
Counter 1
Counter 2
- this counter is now adjusted in all parameter sets of the corresponding
motor
Counter 0 = Value „0“ Counter 1 = Value „1“ Counter 2 = Value „2“
Set 1
Set 5
Set 0
Set 2
Set 6
Set 3
Motor set assignment fr.8
adjust
⇓
⇓
⇓
following
0.fr.8 = 0
2.fr.8 = 1
3.fr.8 = 2
values:
1.fr.8 = 0
6.fr.8 = 2
5.fr.8 = 0
The counter works only in the active set with the measured value. In all inactive sets
it is counted down. If one counter exceeds the limit, the response adjusted in Pn.14 is
triggered.
Description for F5-B, F5-G
and F5-M