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Mounting Power Supplies
The Keyscan DPS-15 is a 13.5 VDC dual linear regulated power supply rated at 2 x 1.2 amps maximum for
powering the ACU circuit boards and the readers. This 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 CLASS 2 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 20. For power supply connections refer to Figure 83 on page
110.
Important
Do not use the DPS-15 to power door strikes or auxiliary equipment.
Select a battery with enough amp hours to operate the system for the total hours specified. The following table
lists power duration times:
Amp-hour Battery
8.0
7.5 *
7.0 *
* 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.
Keyscan Technical Guide (PC109x - 04.12)
Table 2 – Battery Duration Times
Amps
1.4
1.4
1.4
Figure 5 – Plastic Stand Off
Power Duration
5.71 hours
5.36 hours
5.00 hours
19
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