FOR-A VSF-128128, Operation Manual

Page: 23 / 106

11
3-5. Alarm Connector Connection
During operation, the VSF-600 detects voltage drops in the power supply, or stopping of the fan
motor, and monitors CPU card operation. If any problems occur, a non-voltage contact signal is
output from ALARM OUT at the rear. This function enables to send notification of problems to an
external device.
3-5-1. ALARM OUT Connector
Pin assignment
Pin no. Signal
A
B
A and B form a short-circuit if a voltage drop in the power supply,
stopping of the fan motor, or malfunction in the CPU card is detected
during operation.
GND Ground Terminal
Specifications
Single wire:
ɸ
1.0 （ AWG18 ）
Applicable cable
Twisted wire: 0.75 mm²
Single wire:
ɸ
0.4 -
ɸ
1.0
（
AWG26 - 18
）
Twisted wire:0.3 mm² - 0.75 mm²
（
AWG22 - 20
）
Cable allowance
Bare wire diameter:
ɸ
0.18 or more
Standard length of
exposed wire
10mm
Recommended tool for
button operation
Flat-head screwdriver (Shaft diameter
ɸ
3, blade width
2.6 mm)
Alarm output
The table below shows ALARM OUT connector status based on the operating status of
the units and cards.
Main unit
ON/OFF
Output
voltage
Fan
operation
CPU card
operation
ALARM OUT connector
status
OFF
Short circuit between A-B
(connected)
ON OK OK OK
Open circuit between A-B
(not connected)
ON NG OK OK
Short circuit between A-B
(connected)
ON OK NG OK
Short circuit between A-B
(connected)
ON OK OK NG
Short circuit between A-B
(connected)
ALARM OUT
A GND B