Renishaw RGH20, Руководство по установке, Страница: 13 / 19

Output specifi cations
Digital output signals - type RGH20D, X, Z, W, Y, H, I, O
Form - Square wave differential line driver to EIA RS422A
Incremental
✝
2 channels A and B in quadrature (90° phase shifted)
Reference
✝
Synchronised pulse Z, duration as resolution.
Repeatability of position
(uni-directional) maintained within
±10 °C from installation temperature and for
speed <250 mm/s
Signal period
Resolution
A
B
Z
Analogue output signals - type RGH20B
Form - 1 Vpp differential
Incremental 2 channels V
1
and V
2
differential sinusoids in quadrature
(90° phase shifted)
0°
Limit
Asynchronous pulse V
q
Repeatability
<0.1 mm typical
Length of actuating magnet
(V
q
+) - (V
q
-)
1 V
Limit
✝
Asynchronous pulse Q
Q
Repeatability <0.1 mm typical
Length of actuating magnet
NOTE: RGH20 readheads are available
with reference mark or limit switch output.
Select output option at order.
3-state alarm
For RGH20D, X, Z readheads only, differentially transmitted signals forced open
circuit for >20 ms when signal too low for reliable operation.
For RGH20W, Y, H, I, O readheads only, differentially transmitted signals forced open
circuit for >10 ms when signals too low or speed too high for reliable operation.
Alarm
NOTE: RGH20 readheads
are available with reference
mark
or limit switch output.
Select output option at order.
✝
Inverse signals not shown for clarity
108° -18°
(V
0
+) - (V
0
-)
90°
20 µm
0.7 to 1.2 Vpp with
green LED indication
and 120 R termination
Differential pulse V
0
-18° to 108°
Duration 126° (electrical)
Repeatability of position
(uni-directional) maintained within
±10 °C from installation temperature
and for speed <250 mm/s
Reference
(V
1
+) -(V
1
-)
(V
2
+) - (V
2
-)
1 V
SECTION 1 - RGH20 direct output readheads
(continued)