Keyscan Inc. – Technical Guide (PC109x - 04.15)
20
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 1 Amp with 200mA in reserve for accommodating
peak current operating demands. Refer to DPS-15 Dual Power Supply – Current Calculation on page 80 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 standby
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. All warranties are voided if non-compliant transformers or
incorrect voltages are used. The system may operate erratically if the voltage is lower than 12 VDC.
Power supplies are mounted as shown on page 21. For power supply connections refer to Figure 54 on page
83.
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
Amp-hour Battery
Amps
Power Duration
8.0
1.4
5.71 hours
7.5 *
1.4
5.36 hours
7.0 *
1.4
5.00 hours
* 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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