Hall Inputs - Allen-Bradley Ultra1500 2092-DA1 User Manual

line loss detection using exclusive-OR gates that can be disabled in Ultraware if
electrical noise results in nuisance faults.
Figure 2.11
Schematic of the Motor Encoder Inputs
Ultra1500 Drive
A+
A-
The following table provides a description of the A, B, and I inputs.
Parameter Description
A, B, and I Input voltage difference between the + input
ON State and the - input that is detected as an ON
Input Voltage state.
A, B, and I Input voltage difference between the + input
OFF State and the - input that is detected as an OFF
Input Voltage state.
Common Mode Potential difference between any encoder
Input Voltage signal and logic ground.
DC Current Draw Current draw into the + or - input.
Frequency of the A or B signal inputs. The
A, B Input Signal
count frequency is 4 times this frequency,
Frequency
since the circuitry counts all four transitions.

Hall Inputs

The Ultra1500 uses Hall signals to initialize the commutation angle for
sinusoidal commutation with incremental encoders. Hall signals must be
single-ended and can be either open collector type or TTL type. Figure 2.12
shows the configuration of the Hall inputs (S1, S2, and S3).
Figure 2.12
Hall Input Configuration
S1
Ultra1500 Connector Data
0.001 µF 220 Ω
13V
4.7 kΩ
0.001 µF
13V
Ultra1500 Drive
1 kΩ
74HCT14
0.01 µF
Logic Ground
Publication 2092-UM001D-EN-P — July 2005
2-15
+
A
-
DS34C86
A Line Loss
74HCT86
Minimum Maximum
+1.0V +7.0V
-1.0V -7.0V
-7.0V +12.0V
-30 mA 30 mA
— 4 MHz