ADT Security Services ADT-LCD40 User Manual download pdf (Page 21)

ADT-LCD40 Series Electrical Connections Power Connection

Document 50520 Rev D 7/25/00 P/N 50520:D

Section 4:

ADT-LCD40 Series Electrical

Connections

The ADT-LCD40 Series Annunciators can be powered by the Unimode

200 24VDC nominal power or from a remote UL listed, filtered power

supply such as the FCPS-24F. The power run to the annunciator must

be power-limited but need not contain a power supervision relay since

loss of power is inherently supervised through loss of communication

with the annunciator. Maximum ADT-LCD40 Series current draw from

the power supply (under alarm condition) is 66 mA. Maximum current

draw from the control panel's secondary power source (batteries) under

loss of AC power is 28 mA, since the LCD backlight is turned off during

AC loss. Backlighting is turned back on during AC loss only for alarm

conditions in the system.

1. All connections are power-limited and supervised

2. 12 - 18 AWG (0.75 - 3.25 mm

) wire for 24 VDC circuit is

acceptable

3. Power wire distance limitation is set by 1.2 volt maximum line

drop from source to end of circuit.

Figure 4-1: Power Connection

no connection

+24 VDC IN from main power supply

+24 VDC OUT to next ADT-LCD40(L)

-24 VDC IN from main power supply

-24 VDC OUT to next ADT-LCD40(L)

Earth Ground Option

ADT-LCD40 Series

Plug-in Terminal Blocks

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 35 36

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ADT Security Services ADT-LCD40 User Manual Page 21