Adjustment And Setting; Nsk Unit Adjustment - JRC JMA-7710-6 Instruction Manual

8.5

Adjustment and Setting

Although each component of the radar has completely been adjusted in the factory, the adjustments as
described in subsection 8.5.1 to 8.5.3 are required after installation.

8.5.1 NSK Unit Adjustment

The NSK unit of the radar can be applied to almost all types of gyrocompasses just by changing the settings
of keys (step motor type of 24VDC to 100VDC and synchro motor type with primary exciting voltages of
50VAC to 115VAC).
Before turning the power on, follow the procedures below to set switches S1, S2 and S5, and jumper JP1 on
the NSK circuit (PC4201) to make them suitable to the type of the gyrocompass.
Since the gyro selection keys on the NSK circuit is set to the 360X synchrogyro before shipment, adjust the
keys as follows to suit it to the gyrocompass fitted on the ship. For details, see "Appendix 12 Setting Table
of the Gyro Compass and Gyro Select Switches".
(1) Before turning on the system, set the keys and jumper pin on the NSK unit (PC4201) as follows:
S1 : Select the switch to [OFF].
S2 : Gyrocompasses output stepper or synchro signal. So, be sure to check the type of the gyrocompass
fitted on the ship before setting S2.
Synchronizing signal ········ Set S2 to the [SYNC] position.
Stepper signal ··················· Set S2 to the [STEP] position.
S5 : Set S5 to suite the applicable gyro in accordance with the S5 setting table.
S5-1 : Type
Synchronizing signal ····················· [OFF]
Stepper signal ································ [ON]
S5-2, -3 : Gyro ratio
S5-2
S5-3
360X 180X
OFF OFF
OFF ON
8 – 19
90X 36X
ON ON
OFF ON