SAFE-TOUCH
BUTTONS
BACKLIGHT
POWER
UNLOCK
LOCK
9-36 VDC
LOOP
OUTPUT-
NPN open collector output negative.
RESET +
Contact closure alarm acknowledge pull up to 3 VDC.
RESET-
Contact closure alarm acknowledge ground/negative.
Refer to Figure 1 for terminal positions.
WARNING
Observe all safety regulations. Electrical wiring should be performed in accordance with all
agency requirements and applicable national, state, and local codes to prevent damage to the
meter and ensure personnel safety.
Figure 1. Connector Board
2.7
Connections & Wiring Diagrams
Signal connections are made to a four-terminal connector mounted in the base of the enclosure. For
installations without backlight, only the two signal terminals are connected. The 4-20 mA input with
no backlight has a maximum voltage drop of 3 V and is wired as shown in Figure 2. The loop-powered
backlight configuration requires a total maximum voltage drop of 6 V. The backlight is recommended
for dim lighting conditions and is enabled when wired as shown in Figure 3 or Figure 4.
Figure 2. Connections without Backlight
+
-
+
-
OUTPUT
RESET
+
-
+
-
SIGNAL
BACKLIGHT
Summary of Contents for TEK-LCD 7800A-0L1
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