Motor Protection Mode - KEB COMBIVERT F5 MULTI Applications Manual

Protective Functions
6.7.8 Motor Protection
Mode
Description for F5-B, F5-G
and F5-M
Fig. 6.7.8.a Motor protection mode
ru.15 Apparent current
dr.12 Motor protect. rated current
0.1...460.0 A
Motor set assignment fr.8
© KEB Antriebstechnik, 2002
All rights reserved
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:
fr.8
Parameter set selection
Motor set assignemet
see Chapt. 6.8
0
1
2
3
4
5
6
7
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
⇓
Counter 0
- 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
⇓
adjust
following 0.fr.8 = 0
values: 1.fr.8 = 0
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.
Name: Basis
KEB COMBIVERT F5
Functional Description
⇒ 2 hours
1,2 • I
n
⇒ 2 minutes
1,5 • I
n
⇒ 1 minute
2 • I
n
⇒ 5 seconds
8 • I
n
dr.11
Counter 0 0
Counter 1 1
Counter 2
Counter 3
Pn.14
Counter 4
Counter 5
Counter 6
Counter 7
2. Motor
⇓
Counter 1
⇓
Set 0 Set 2
⇓
2.fr.8 = 1
Electronic motor protection
Separate cooling
Self-cooling
Motor protect. function response
0...6 (see Chapt. 6.7.6)
3. Motor
⇓
Counter 2
Set 6 Set 3
⇓
3.fr.8 = 2
6.fr.8 = 2
Datum Kapitel Abschnitt
6 7
04.05.04
6
Seite
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