page
1
phone: 360.260.2468
l
sales: 800.736.0194
l
fax: 360.260.2469
email: sales@usdigital.com
l
website: www.usdigital.com
11100 ne 34th circle
l
vancouver, washington 98682 USA
SEI-UPS
SEI Bus Uninterruptable Power Supply
US
Digital
C o r p o r a t i o n
TM
Technical Data, Rev. 04.02.03, April 2003
All information subject to change without notice.
Up to 40 hours of power backup for an A2 absolute encoder
operating in multiturn mode.
DIN rail mounting is available.
Compact and rugged design.
0 to 45 C operating temperature.
10 hours recharge time from a fully discharged state.
Output is current limited to 150mA and will not be damaged if shorted.
Green power indicator LED indicates primary power status
US Digital warrants its products against defects in materials and
workmanship for two years. See complete warranty for details.
Features:
The SEI-UPS is designed to provide battery backup power to an SEI device
such as an A2 or AD5 for up to 40 hours. The SEI-UPS contains a six-cell
rechargeable nickel cadmium battery pack that provides 0.7 AmpHours of
power to an SEI device after primary power is lost. DIN rail mounting is available.
Internal charging circuitry automatically keeps the battery pack charged.
Maximum battery life is insured by the internal circuitry that delivers the optimum
charge current to the batteries independent of the load. This setting requires
10 hours to fully charge the batteries from a fully discharged state. US Digital
ships the units fully charged and ready for service.
Description:
Ordering Information:
Price:
$99 / 1
$89 / 10
$85 / 50
$79 / 100
SEI-UPS -
R = DIN rail (35mm wide) mounting.
Cost Modifiers:
Add $10 for R-option.
Part #:
Parameter
Min.
Max.
Units
Operating temperature
0
45
C
Humidity (non-condensing)
0
95
%
Supply voltage (PWR)
0
16
Volts
ESD warning: Normal handling precautions should be taken to avoid
static discharge.
Absolute Maximum Ratings:
PS-9V
AD2-B
To Computer
SEI-UPS
A2 Absolute Encoders
ED2 Digital Readout
US Digital's
SEI Bus
TM
TM
Protected
SEI Bus
Example SEI Network:
page
2
phone: 360.260.2468
l
sales: 800.736.0194
l
fax: 360.260.2469
email: sales@usdigital.com
l
website: www.usdigital.com
11100 ne 34th circle
l
vancouver, washington 98682 USA
SEI-UPS
SEI Bus Uninterruptable Power Supply
US
Digital
C o r p o r a t i o n
TM
The A2 is a single turn optical shaft encoder that reports the absolute shaft angle even after a power failure. The A2 can be placed in multi-turn mode which
includes the number of full revolutions in the reported position. However, if power is lost, the revolution counter portion of the reported position will be reset
and the A2 will set a flag indicating that a home cycle is needed. A simple way to overcome this inconvenience is to provide uninterrupted power to the
A2 by inserting the SEI-UPS in line with the SEI cable feeding the A2.
The AD5 is a quadrature encoder to SEI bus adapter. It contains four 24-bit counters that track four incremental encoders. If power is lost, the counters
reset to zero and a home cycle is needed. Providing an uninterruptable power source to the AD5 by inserting the SEI-UPS in line with the SEI cable feeding
the AD5 will solve this inconvenience.
The SEI-UPS when fully charged provides 0.7 AmpHours of usable power. To calculate how long the backup will last during an outage, simply divide
0.7AmpHours by the current requirements of the SEI device. Since the A2 requires a maximum of 16mA, the battery pack should last for 0.7AmpHours
/ 0.016Amps = 43.75 Hours. Two A2s would last approximately 22 hours, and so on. The AD5 requires a maximum of 60mA and a non-index low resolution
encoder requires 40mA. To calculate the maximum length of time of a power outage for an AD5 with one encoder attached divide 0.7AmpHours by 100mA
= 7 Hours. If using the SEI-UPS to supply power to an AD5, do not connect more than one encoder with index or more than two non-index encoders. This
will prevent the load from exceeding 150mA.
The internal circuitry also disconnects the load when the batteries have been drained to the point that the average voltage falls below one volt per cell.
The SEI-UPS current is limited to 150mA and will not be damaged if shorted. The SEI-UPS should be located in an indoor environment due to the limited
temperature range of Ni-Cad batteries. The system should be wired so that primary power is normally provided full time except during periods of abnormal
power outages. These measures should provide seven to ten years of reliable service before replacement is recommended.
Note: As with any Ni-Cad battery, we recommend that you ask your local disposal company for advice on the appropriate disposal instructions.
Notes:
Parameter
Min.
Typ.
Max.
Units
Supply Voltage (PWR)
10
12
16
Volts
Supply Current (no encoders)
-
70
-
mA
Output Voltage to Encoders
6.0
7.2
8.6
no supply power
Output Current to All Encoders
-
-
340
mA
Specifications apply over entire operating temperature range.
Electrical Characteristics:
Mechanical Drawing:
PDF 
ZIP