1.
Description
The con ver ter
FT 9004
is a fre quen cy di vi der in a snap-in hou sing for 35mm rail
moun ting. The unit is able to di vi de in put fre quen cies re spec ti ve ly pul se chains of in -
cre men tal en co ders. The di vi der va lue is ad jus tab le by the user. The unit can be used
for in put fre quen cies up to 90 kHz.
The re are two ope ra ting mo des. One mode is able to di vi de two in put pul se chains
90° out of pha se ap plied to the in put chan nels "In put A" and "In put B". A se cond ope -
ra ting mode uses only in put chan nel "A" for the in put pul se chain. The ot her in put
chan nel "B" de ci des when using this mode the di rec ti on of the out put pul se chains.
The re are two open col lec tor out put chan nels "Out 1" and "Out 2". At both ope ra ting
mo des the out put chan nels "Out 1" and "Out 2" are ge ner ating ou put pul se chains 90°
out of pha se, di vi ded by the ad jus ted divider va lue.
The in put chan nels "In put A" and "In put B" are opto iso la ted. Sour ce sig nals of at least
5 mA are nee ded to dri ve the in put chan nels. The in put vol ta ge le vel can be set by the
user by in ter nal jum pers to the de si red in put le vel of 5 V, 12V or 24 V.
The out put chan nels are iso la ted from in put chan nels as well as from the po wer supp -
ly in put. The out put chan nels con sist of po ten ti al free col lec tor-emit ter pat hes. By that
the cus to mer can crea te an out put le vel to his own re qui re ments using two re sis tors
and an ex ter nal po wer supp ly.
The functio nal struc tu re of the con ver ter is shown in pic tu re 1. The re are two ad jus -
tab le re sis tor networks for in put vol ta ge le vel ad just ments, fol lo wed by opto coup ler
in puts, a fre quen cy di vi der and the open col lec tor out puts "1" and "2".
3
ERMA-Electronic GmbH
1. Description
1
2
3
+
-
4
Power
supply
5
6
Input A
Input B
GND (-)
24 V
FT 9004
Encoder
PE
7
8
9
Out
1
Out
2
GND
L
e
v
e
l
+3...30 V
1...2 kOhm
Pic tu re 1