16.3. About Pin 7 of the Control/Monitor Terminals

A ground common to all the control and monitor terminals is assigned to Pin 7.
Both Pins 7 of the Control/Monitor terminal for CH1 and CH2, and that for CH 3 and CH4 are internally
connected to each other.
Pins 7 are isolated from the unit body.

16.5. Connection Cable and Maximum Cable Length

For the connection cable, use a Category 5 twisted pair cable for LAN (CAT5-UTP).
The maximum cable length is 600 m (656.17 yd).

16.4. Terminal Pin Arrangement

About operation and terminal status
• The same information is output from both Pins 8 (fan status output) of the CH1 and CH2 terminal, and the
CH3 and CH4 terminal.
Lighting status of the protection indicator on the front panel matches operation of protection status provided
at the monitor terminal.
HI-LEVEL LO-LEVEL
Control terminal (input) 9 – 14 V DC 0 – 3 V DC
Monitor terminal (output) OFF ON
Protection indicator (front panel) Light off Light on
Protection status (output) OFF ON
Terminal Pin No. Pin name
Unit operation status
HI-LEVEL LO-LEVEL
CH1, 2 CH1 power ON/OFF control (input) CH1 power OFF CH1 power ON
CH1 protection status (output) CH1 normal CH1 protection activated (irregular)
CH1 power ON/OFF status (output) CH1 power OFF CH1 power ON
CH2 power ON/OFF control (input) CH2 power OFF CH2 power ON
CH2 protection status (output) CH2 normal CH2 protection activated (irregular)
CH2 power ON/OFF status (output) CH2 power OFF CH2 power ON
GND (input/output)
––
Fan operation status (output) Fan stop (irregular) Normal
CH3, 4 CH3 power ON/OFF control (input) CH3 power OFF CH3 power ON
CH3 protection status (output) CH3 normal CH3 protection activated (irregular)
CH3 power ON/OFF status (output) CH3 power OFF CH3 power ON
CH4 power ON/OFF control (input) CH4 power OFF CH4 power ON
CH4 protection status (output) CH4 normal CH4 protection activated (irregular)
CH4 power ON/OFF status (output) CH4 power OFF CH4 power ON
GND (input/output)
––
Fan operation status (output) Fan stop (irregular) Normal
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
17