Keyscan Technical Guide (PC109x - 04.12)
109
System Power-up
The following is a guideline to follow on initially powering up the control board.
• connect 12 VDC power to the control board as shown in Figure 83 – Power Supply Wiring
• connect fully-charged backup battery
• connect 2 x 16V 40VA or 16.5V 37VA Class 2 transformers - ensure that both CSA/UL approved
transformers and fully-charged backup battery are connected for proper system operation - do not mount
the transformers or bring 120/240 VAC inside the ACU metal enclosure
• repeat battery and transformer connections for additional power supplies
• after power is applied to the ACU, check ACU voltage test points - refer to Table 15 and Table 16.
• if System Mode J17 was altered, momentarily short J6 before loading the factory default settings outlined
in the next step
• load factory default settings by shorting jumper J16 – pin H, and then momentarily short the Clear
Memory Jumper J1 on the control board
• remove the jumper from J16 – pin H.
• after all correct voltage and current measurements are verified upload the database to the ACUs - refer to
the Client on-line help
Notes
For battery circuit and auxiliary power output to function, two (2) transformers must be connected.
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