Japan Radio Co. JLN-740A, Инструкция по эксплуатации

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1-3 Chapter 1 Outline of the Equipment
1
Ship speed alert function (JLN-740A/740N)
This function enables the setting of an upper limit and a lower limit for the ahead/astern ship speeds by
using any value.
Since an alert is issued if the ship speed exceeds any of the set values, the values can be used as the
guidelines for maintaining a constant speed.
Transducer mounting damage prevention function (*under the process of patent acquistion)
This equipment prevents damage of the oscillator due to the excessive output by controlling the
transmission output according to the individual differences of the oscillators within the transducer.
Transducer mounting checking function
This function can check the waveforms that are received through the transducer mounting from the
bridge and the operating status of the transducer mounting by connecting a maintenance PC.
This eliminates the necessity for the shifting to the boatswain’s store/bottom compartment and its
ventilation, thereby reducing the time required for maintenance/service.
Bubble detection function (*under the process of patent acquisition)
Bubbles near the transducer mounting radiation face can be detected by sending bubble detection
ultrasonic signals at a constant interval.
This function facilitates the detection of the cause of the missing values, which is difficult in the existing
equipment.
AC power failure detection function (JLN-740A/740N)
This function outputs an alert and inputs ACK at a dedicated contact input/output when the AC power
voltage drops. To operate the detection circuit, connection of DC24V is necessary.
Dimmer function (JLN-740A/740N/741N)
A dimmer function of the display unit by an external volume is supported.
Individual control/bulk control can be selected by using the display dimmer.
Applicable standards
This equipment complies with the following standards.
IMO MSC.334(90)
IEC61023 ed.3
IEC60945 ed.4
IEC61162-1 ed.4
IEC61162-450
IEC62288 ed.2