ILS Strobe Lighting Systems
DOC-3400-MNL Rev23.doc
(9/22/2021)
Copyright 2007-2021 ITL, LLC Page 59
of
86
2. ITL-3401-RLY Relay Board
The ITL-3401-RLY alarm relay board connects directly to the ITL-3400 main board and
contains all Form-C dry contact alarm relays indicating alarm status of the ILS-
1400/2400/3400 system. In addition, the board contains one mode relay indicating day or
night mode operation.
Each relay has one corresponding LED indicating the state of the relay. In the alarm
state a relay is disengaged, i.e. no power, and the corresponding red LED is lit. The
green night mode LED is lit when the unit is operating in night mode.
For connection detail, please refer to the
IPS-3400 Power Supply Wiring Diagram.
Figure 58: ITL-3401-RLY Alarm Relay Board Picture