Keyscan Inc. – Technical Guide (PC109x - 07.15)
Mounting the DPS-15 Power Supply
The Keyscan DPS-15 is a 13.5 VDC dual linear regulated power supply for powering the ACU circuit boards and
the readers with the following outputs:
ACU output 12 VDC @ 1.2 Amperes
AUX/RDR output 12 VDC @ 1.2 Amperes
Maximum Current Draw
The total current draw on each output should not exceed one (1) Ampere with 200mA in reserve for
accommodating peak current operating demands. See page 120 and use the calculation tables to determine
the total current demand of the all the devices connected to 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.
Mount the DPS-15 power supply as shown on page 21. For power supply connections, refer to Figure 85 on
page 124.
Important
Do not use the DPS-15 to power door strikes or auxiliary equipment.
Backup Batteries
Select a battery with enough amp hours to operate the system for the total hours specified. The following table
lists power duration times:
Table 2 – Battery Duration Times
* Indicates the two most commonly used backup batteries.
Plastic Stand Offs
Plastic stand offs are pre-mounted on most power supplies, relay and communication boards. In cases where
stand offs are not pre-mounted, insert the double pronged end of the stand off in the metal enclosure hole
first. Then mount the circuit board to the stand offs.
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