KEB COMBIVERT F4-C Applications Manual

6 10
KEB COMBIVERT F4-C
10
Name: Basis
19.11.98
Chapter Section Page Date
© KEB Antriebstechnik, 1997
All Rights reserved
Functional Description Encoder Interface
The initiator evaluation consists mainly of a counter, which is increased at every edge
of the input signal
The speed can now be calculated from the counter change per time:
The line number is adjusted via dr.30 (channel2). The time gate can be changed via
dr.38 (channel 2 according to following formula:
Thus the resolution of the initiator evaluation depends on the line number of the used
system and the size of the time gate for the differentiation of the counter content.
Under consideration of the resolution of parameter dr.38 it results in following formula
for Delta n in 1/min:
[]
∆
n
dr
dr
1
7500
30 2
38
/ min
.*
.
=
This shows, when using initiator systems with low line numbers only a rough speed
resolution can be attained or the time gate must be chosen very large which results
in a slower detection.
The result of the initiator evaluation is always a positive speed (direction of rotation
FOR). At dr.43 = 1 the sign of the determined speed of the initiator evaluation
corresponds to the sign of the output frequency. By way of parameter dr.34 (channel
2) the direction of rotation of the speed measurement may be reversed.
The speeds for channel 1 or channel 2 selected with dr.24 can be multiplied by a
gearbox factor. The gearbox factors are adjusted via dr.35 (channel 1) or dr.36 (channel
2). This allows the evaluation of incremental encoders which are not directly mounted
on the motor shaft.
To indicate overshooting and unpermissble limits the speed measurement generates
the error message E.co1 / E.co2. This error occurs when in any section of the speed
or frequency calculation a speed > 9999 min
-1
or a frequency > 409,6 / 819,2 Hz
occurs.
Inverter status E.co1 = 54
Inverter status E.co2 = 55
6.10.9 Evaluation of
Initiators
6.10.10 Gearbox Factors
6.10.11 Error Message
E.co1/E.co2
6.10.12 Definition of
Actual Value
Channel
(cn.3)
With cn.3 the channel which supplies the actual frequency to the subsequent control
is defined. Following adjustments are possible:
cn.3: 0 ⇒ Output frequency
1 ⇒ Channel 1
2 ⇒ Channel 2
The selected actual value is indicated in ru.47 as actual frequency and in ru.1 as
actual speed!
n =
counter difference
2 • encoder increments • time gate
time gate = 4ms • 2
dr.38
∆ n =
1
2 • encoder increments • time gate

KEB COMBIVERT F4-C Specifications

General

Brand	KEB
Model	COMBIVERT F4-C
Category	DC Drives
Language	English