JRC JMA-5212-4 Installation Manual page 51

1.2) Connecting the JMA-5200MK2
2) Setting and adjusting the NSK unit
The NSK unit of the radar equipment is designed to be compatible with almost all types of gyro compass
by switch operation (24 VDC to 170 VDC for the step-motor type, and for the synchro-motor type, the
primary excitation voltage is 35 VAC to 120 VAC). Before turning on the power, be sure to set switches
S1, S2, S3, S4, S5 and jumper TB105 on the NSK unit (PC4201) according to the type of the gyro
compass by referring to the procedure described below. Normally before shipment, the gyro I/F circuit's
gyro select switch has been adjusted such that the gyration ratio is 180X and it is compatible with the
step-type gyro compass. Check the type of the gyro compass used in own ship and make settings
according to the procedures below:
<1> Set the switches of the NSK unit (PC4201) before turning on the radar equipment.
S1: [OFF]
S2, S3: The output of the gyro compass is either step signal or synchro signal. Carefully
check own ship's gyro compass, and adjust settings for S2 and S3.
Synchro signal......... [SYNC]
Step signal ............... [STEP]
S4: Make settings for S4 according to the S4 setting table.
S4-1 Set the LOG alarm.
No LOG alarm ........ [OFF]
LOG alarm .............. [ON]
S4-2 Set the gyro simulator.
[OFF]
S4-3 Set the LOG simulator.
[OFF]
S4-4 Not in use.
S4-5 Set the time to the gyro alarm
0.5 seconds .............. [OFF]
5 seconds ................. [ON]
3-26
Photograph 2
Insert the 8-pin connector
(IND) of CFQ-6998 (unit
dedicated connection cable
that is enclosed by the
NCT-4106) to the connector
of processing unit J5.
3