22
7. EXTERNAL CONTACT CONTROL
7-1. Outline of Functions
・
It is possible to control the MAIN OUTPUT key and the PRESET 1 to PRESET 4 keys through the
external contact control connector on the rear panel (hereinafter referred to as the connector J1).
It is also possible to input an external alarm signal (for turning off the MAIN OUTPUT key forcedly)
and output an alarm signal through the connector J1.
・
Open all pins of the connector J1 to operate the PAR-A power supply unit with the keys on the front
panel.
・
When some of S1 to S6 shown in Fig.10 is turned on, the LED of the KEY LOCK/LOCAL key on
the front panel blinks in green.
7-2. Specifications of External Contact Control Connector
Pin No.
Function
1,2
Used for alarm signal input or output when short-circuited with pin 1 to 2.
3
COM terminal of the internal circuits. Used for external contact control when
short-circuited with pin 2 to 6.
4 to 7
Used for preset operation when short-circuited with pin 3.
8
Used for main output operation when short-circuited with pin 3.
※
Connect the lead wires with connectors supplied with the PAR-A unit with the connector J1.
※
If it is necessary to expand the lead wires with connectors supplied with the PAR-A unit, they
must be soldered properly and the soldered joint must be protected with insulation tube or the
like.
※
The lead wires with connectors supplied with the PAR-A unit are color-coded according to the
markings of the J1 on the rear panel.
7-3. Operation Procedures
Fig.10 Usage of External Contact Control
S1
：
External alarm is input when goes active (shorted)
.
External contact control connector J1
+5V
10k
Ω
S2
1
8
V
S2
：
PRESET 1 is selected when goes active (shorted).
S3
：
PRESET 2 is selected when goes active (shorted).
S4
：
PRESET 3 is selected when goes active (shorted).
S5
：
PRESET 4 is selected when goes active (shorted).
S6
：
MAIN OUTPUT KEY is turned on when goes
active (shorted).
The voltmeter reads 0V when an OHA alarm occurs
in the PAR-A unit.
Inside of the
PAR-A unit
S3
S4
S5
S6
S1
Voltmete
r
＋
－
×
6
