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參數(shù)資料
| 型號： | SDC-14587-375Y |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 位置變換器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, DIP36 |
| 封裝： | DDIP-36 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 202K |
| 代理商： | SDC-14587-375Y |
6
Data Device Corporation
www.ddc-web.com
SDC-14580
H-05/04-0
also change to logic 0 for an over-velocity condition, because the
converter loop cannot maintain input-output or if the converter
malfunctions where it cannot maintain the loop at a null. BIT will
also be set if a Loss-of-Signal (LOS) and/or a Loss-of-Reference
(LOR) occurs.
PROGRAMMABLE RESOLUTION (A, PIN 35; B, PIN 36)
Resolution is controlled by two logic inputs, A and B (see TABLE
3). The resolution can be changed during converter operation so
the appropriate resolution and velocity dynamics can be
changed as needed. To insure that a race condition does not
exist between counting and changing the resolution, inputs A
and B are latched internally on the trailing edge of CB (see
FIGURE 2). For more information refer to the Accuracy and
Resolution section.
SPECIAL DESIGN CONSIDERATIONS
Due to its high dynamic capability in 10- and 12-bit mode, the
SDC-14580 series of converters has a potential for a spin-
around condition. A spin-around condition occurs when the con-
verter does not track and the angular input and the digital output
;;;
;;
A,B
0
s MIN
CB
0.1
s MIN
FIGURE 2. RESOLUTION CONTROL TIMING DIAGRAM
30
90
150
210
270
330
360
θ
(DEGREES)
CCW
In
Phase
with
RL-RH
of
Converter
and
R2-R1
of
CX.
0
S1-S3 = V
SIN
θ
MAX
S3-S2 = V
SIN(
θ + 120°)
MAX
S2-S1 = V
SIN(
θ + 240°)
MAX
- V
MAX
+ V
MAX
30
90
150
210
270
330
360
θ
(DEGREES)
CCW
In
Phase
with
RH-RL
of
Converter
and
R2-R4
of
RX.
0
S2-S4 = V
COS
θ
MAX
S1-S3 = –V
SIN(
θ)
MAX
- V
MAX
+ V
MAX
Standard Synchro Control Transmitter (CX) Outputs as a Function of CCW Rotation
From Electrical Zero (EZ).
FIGURE 3. SYNCHRO AND RESOLVER SIGNALS
Standard Resolver Control Transmitter (RX) Outputs as a Function of CCW
Rotation From Electrical Zero (EZ) With R2-R4 Excited.
TABLE 3. RESOLUTION CONTROL
B
(PIN 36)
A
(PIN 35)
RESOLUTION
0
1
0
1
0
1
10 Bit
12 Bit
14 Bit
16 Bit
continuously counts (spins) from 0° to 359.999°. An indication of
a spin-around condition is the digital output changing as the syn-
chro or resolver input is stationary. During this time, the BIT may
flag an error condition and the velocity output may be at the max-
imum positive or negative output voltage. This potential problem
may happen at the time the unit is powered up, during a step, or
during instantaneous acceleration.
To avoid the spin-around condition when using the SDC-14580
converters in 10- or 12-bit mode, the following is required:
1) Power up the SDC-14580 converter in either the 14- or 16-
bit resolution mode and once it has settled change to the
10- or 12-bit mode.
2) Avoid large steps and instantaneous accelerations.
3) If the dynamics required by the system do not exceed the
dynamics of the SDC-14580 converter in the 14-bit mode,
then set the unit for the 14-bit mode and disregard the
additional LSBs.
INTERFACING - INPUT
SIGNAL INPUT OPTIONS
The SDC-14580 series offers three input options: synchro,
resolver, or direct resolver input. In a synchro or resolver, shaft
angle data is transmitted as the ratio of carrier amplitudes across
the input terminals. Synchro signals, which are of the form sin
θ
cos
ωt, sin(θ+120°)cosωt, and sin(θ+240°)cosωt are internally
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