Rockwell Automation 845GM Size 20 Absolete Encoder Installation Instructions - Manual

Installation Instructions
Size 20 Absolute Encoder, Bulletin 845GM-NXC8024
IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.
Specifications
Electrical
Code Format Gray Code
Resolution
Counts per Rev. (CPR)
256 CPR (8 bit)
Accuracy
"1 bit
Requency Response 16K words/sec
Power Requirements 8-24V DC @ 150mA maximum
Output Drive Capability 16mAĊNPN Open Collector
Output Logic High True
Logic 0" = 0.0 to 0.6V DC
Logic 1" = 24V DC maximum (Open Collector)
Direction Control Field selectable for increasing counts
(CW or CCW)
Reset Reset position value to zero. Only with shaft staĆ
tionary.
Mechanical
Starting Torque 3.5in-oz. Typical [0.025 NDm]
Running Torque 3.5in-oz. Typical [0.025 NDm]
Shaft Loading Axial 40lbs [178N]
Radial 40lbs [178N]
Shaft Size 9.517mm (3/8in) w/flat
Moment of Inertia 0.30oz-in 2 (54gcm 2 ) maximum
Slew Sped 5000RPM
Environmental
Housing NEMA Type 4, 13; IP66
Temperature 0°C to +85°C (+32°F to +185°F)ĊOperating
-20°C to +85°C (-4°F to +185°F)ĊMax Working
-40°C to +100°C (-40°F to +212°F)ĊStorage
Humidity 90%, Noncondensing
Shock 50g (11ms duration)
Vibration 20g (58-150Hz), 1.5mm displacement (10-58Hz)
Appoximate
Shipping Weight
1lb (0.45kg)
ATTENTION: The shielded cables, output devices,
and power supplies must be properly grounded. All
National Electric Code and applicable local codes
and ordinances must be observed when wiring the
system.
Electrical Connections
Wire Color Function
Black DC Common
Red +DC
White Reset to Zero
Green MSBC
Orange Bit 0
Blue Bit 1
Brown Bit 2
Yellow Bit 3
Violet Bit 4
Gray Bit 5
Pink Bit 6
Tan Bit 7
Shield Not Connected
Accessories
Description Part Number
High Performance Flexible Coupling 845-FC-*-*
Measuring Wheels 845-MW-A-*
Servo Clamps 845-SC
*See Sensors catalog for selection.
Direction Control Ê
Counterclockwise rotation of the shaft will produce increasing
counts. For increasing counts with a clockwise rotation, use
the Most Significant Bit Complement instead of the Most
Significant Bit. See Electrical Connection table for wire
designation.
ATTENTION: For parallel gray code: connecting the
MSB or MSBC to +DC will result in permanent
damage to the encoder.
Reset Pin
The shaft must be stationary before using the reset function.
Connecting the Reset Wire to +DC will reset Gray Code
position value to maximum (e.g., 255) if MSBC is used, to
zero if MSB is used. The reset function requires a connection
to +DC for 0.1 seconds or longer.
ATTENTION: Activating the Reset results in a
change of position reading. This can cause
unexpected motion which could result in damage to
the product, equipment, or personal injury.
Ê Rotation is viewed from the end of the encoder shaft.