• Information

April 2008: Automation of Signal Stations and Replacement of Old Signal Lights

We delivered flashing signal lights to the Second Regional Japan Coast Guard Headquarters. The Miyagi and Hachinohe Coast Guard Offices started to provide navigation control services.

History of the introduction of flashing signal lights for navigation control

(1) The Sendai Shiogama Signal Station, which was on a remote island (Mahanashijima Island; Figure 1) in Shiogama Port, Sendai, was moved to the Miyagi Coast Guard Office in order to start navigation control operations within the port. Control officers, who had been stationed at the Shiogama Signal Station since 1963 for navigation control operations, were now able to control navigation by operating and monitoring signal lights from within the Miyagi Coast Guard Office by remote control.

(2) Following the Shiogama Signal Station, the Hachinohe Signal Station was also moved to the Hachinohe Coast Guard Office to enable control officers to control navigation by operating and monitoring signal lights from within the coast guard office by remote control.
(Securing navigation safety for ships traveling under the Hachinohe Bridge)
※* Coast guard offices use information technology and operate signal lights that are more luminous than previous models by remote control in order to ensure navigation safety.

(3) Signal light systems delivered to the Miyagi and Hachinohe Coast Guard Offices

Item name Breakdown Quantity
Flashing signal lights
for navigation control
  2 sets
  Directional light devices (each with 4 lights: 4 red lights) 2 units
Directional light devices (each with 4 lights: 2 red lights and two white lights) 2 units
Directional light devices (each with 2 lights: 2 red lights) 1 unit
Directional light devices (each with 2 lights: 2 white lights) 2 units
Signal light control boards 2 units

Specifications (signal lights)

Item Standards, performance, etc.
Light bulb Shield-beam bulb: 100-V 300-W per light
Luminous intensity at the center: 20,000 Cd or greater per light
Horizontal beam: approximately 40 degrees
Average life: 1,500 hours or longer (continuous rating)
Front glass Heat-resistant reinforced glass: 4 mm or more in thickness
Filter Heat-resistant reinforced red glass: 2 mm or more in thickness

Specifications (control boards)

Item Standards, performance, etc.
Structure Indoor stand-alone installation type
Output signal AC 100-V blinking signal method
I flashing light: 0.5 seconds
R: 1 red light flash per 2 seconds
W: 1 white light flash per 2 seconds
RR: 2 red light flashes per 3 seconds
RW: 1 red light flash and 1 white light flash per 3 seconds
RRRWWW: 3 red light flashes followed by 3 white light flashes per 6 seconds
Auto-dimming at night Light dimmed to about 30% of the daytime light level by automatic or manual operation using sunlight-controlled circuits
Control and monitoring Manual operation and manual operation display
- Switching between different output signals
- Operation for the putting out of all light bulbs
Remote-control connection Connections to digital (DI/DO) or analogue (AO) interfaces are made in accordance with either one of the following specifications in order to perform communication functions:
- Photocoupler input: DC 24 V, approximately 4 mA PLC
- Contact output: DC 24 V, 2 A
- RS232C (connector D-sub9P) Ethernet