Keyscan Inc. – Technical Guide (PC109x - 07.15)
DPS-15 Power Supply Connections
Power Supply Specifications
The Keyscan DPS-15 is a 13.5 VDC dual linear regulated power supply for powering CA & EC circuit boards and
the readers with the following outputs:
ACU output 12 VDC @ 1.2 Amperes
AUX/RDR output 12 VDC @ 1.2 Amperes
Before making any power connections at the ACU, Keyscan recommends that you use the tables on the
following pages and calculate the sum of the current demand for the devices drawing power from the ACU
supply side and the RDR AUX supply side ensuring that you do not exceed the DPS-15’s current capacity.
On CA8500B control boards, readers with higher current specifications may collectively exceed the capacity of
the DPS-15 RDR AUX supply. If this occurs, you require an additional power supply.
Do not connect the reader power wire (red) to the ACU supply side of the DPS-15.
CSA/UL Approved Transformers
The DPS-15 power supply requires either of the following class 2 CSA/UL approved transformers and a backup
battery with sufficient amp hours.
2 x 16 V 40 VA
2 x 16.5 V 37 VA
The purpose of two transformers is to comply with UL STD 294, CSA STD C22.2, and charge the battery
circuit. The transformers must be located within 30 feet of the Keyscan power supply. Do not mount the
transformers inside the ACU metal enclosure. Use of non-compliant transformers or deviation from the use of
two (2) approved transformers per access control unit or incorrect voltages void all Keyscan warranties. The
system may operate erratically if the voltage is lower than 12 VDC.
Wiring Connections
Before connecting power at the ACU, be sure to observe the following points:
verify the devices do not exceed the power supply ratings
check the cable and wire connections
ensure no short circuits exist when measuring voltages
verify the DC polarity is correct for all equipment
ensure the backup battery is fully charged
Following the above guidelines ensures each device will function properly and not be damaged.
Keyscan Circuit Board Current Ratings
The following table outlines Keyscan door and elevator control board, communication board, output relay
board, and specialty communication board current ratings. Use the current calculation worksheets for
determining power supply requirements. Ratings are based on 12 VDC. Do not exceed the recommended
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