TriPoint VertexRSI 7200, Руководство по эксплуатации и обслуживанию

Страница: 29 / 266

O V ERVIE W
2 - 1 4
2.4.2.6 AZ a nd E L D ri v e Moto r s
Three-phase i nduct i on gearmotor assemb li es are ut ili zed for actuat i on of the A Z and
EL axes. The motors are s i zed based upon dead w e i ght, fr i ct i ona l , and w i nd- l oad i ng
requ i rements, as w e ll as the requ i red ax i s ve l oc i t i es. The standard motors can be
connected for e i ther 2 0 8 or 3 8 0 - 4 1 5 V A C three-phase i nput, based upon the li ne
vo l tage ava il ab l e to the dr i ve cab i net. The motors have sea l ed, permanent,
synthet i c grease l ubr i cated bear i ngs and the gearboxes are l ubr i cated w i th synthet i c
gear o il , m i n i m i z i ng ma i ntenance requ i rements.
2.4.2.7 Abso l ut e P os i t i on T r a nsdu ce r s
A ngu l ar pos i t i on feedback i s prov i ded by abso l ute pos i t i on transducers (reso l vers)
for each ax i s. The standard conf i gurat i on i nc l udes s i ze 1 1 s i ng l e-speed, brush l ess
reso l vers w h i ch, comb i ned w i th the pos i t i on encod i ng c i rcu i try i n the A C U, y i e l d an
accuracy of 0.0 2 degrees, root mean square (RMS). The reso l ver reference vo l tage
for the standard dev i ces i s 4.6 V RMS, at 2 5 0 0 Hz.
Encod i ng system opt i ons i nc l ude e l ectr i ca ll y w ound t w o-speed reso l vers or abso l ute
opt i ca l encoders to prov i de i ncreased reso l ut i on and accuracy. W i th the t w o-speed
opt i on, an overa ll contro l system accuracy of 0.0 1 degree peak error i s ach i eved.
In th i s conf i gurat i on, dua l mono li th i c reso l ver-to-d i g i ta l convers i on IC ’s are used i n
the A C U w i th b i t rotat i on techn i ques i ncorporated to s i gn i f i cant l y i ncrease b i nary
reso l ut i on. V ar i ous opt i ca l encoder conf i gurat i ons a ll o w for reso l ut i on and accuracy
l eve l s commensurate w i th the most demand i ng system app li cat i ons.
2.4.2.8 Ax i s Ov e r t r a v e l L i m i t Sw i t c h e s
O vertrave l i s prevented i n each d i rect i on for each ax i s of rotat i on by e l ectr i ca l li m i t
s w i tches w i th norma ll y c l osed (open upon li m i t engagement) contacts. The
s w i tches are des i gned w i th doub l e break contacts such that movement of the
s w i tch actuator i n e i ther d i rect i on opens a correspond i ng set of d i screte contacts.
In th i s manner, on l y one li m i t s w i tch assemb l y i s requ i red for each ax i s. Each
s w i tch i s mounted w i th bracketry w h i ch i nc l udes ad j ustab l e str i kers for each
d i rect i on of trave l .
2.4.2.9 D ri v e C a b i n e t L ow-T e mp e r a tu r e Opt i on
The standard 7 2 0 0 A C S dr i ve cab i net i s rated to operate i n an outs i de amb i ent
temperature range of 1 4 F (-1 0 C) to 1 2 2 F ( + 5 0 C). For systems w here the
amb
i ent temperature w ill fa ll be l o w 1 4 F (-1 0 C), an opt i ona l l o w-temperature
package i s ava il ab l e for the dr i ve cab i net.