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Hitachi SRL Series Instruction Manual page 14

Oilfree scroll compressor
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Installation(continued)
Remote Input and Output Signals
The following input and output signals terminal block is equipped in the power supply control panel.
# Use shielded wires as input signal wires.
Terminal
No.
Description
When utilizing customer control run,
connect this to the external terminals
of the customer's controller. When
controlled by a customer's controller,
"b" will be indicated on the digital
display. (Only pressure switch control
mode is allowed.)
Customer Control
Run Change-over
Signal
Under remote operation, the operation
of the air compressor is controlled
by the input signal from the remote
Remote Operation
switch. Under customer control run,
Command Signal
the operation of the air compressor is
controlled by the input signal from the
control panel of the customer.
Before the remote operation of the air
compressor can be used, the operation
switch must be activated. If the mode
of the air compressor is changed to
remote operation a change-over signal
will occur. A character "r" (Remote
mode) is displayed on the left most
position of the digital display.
Remote Operation
C h a n g e - o v e r
Signal
When remote control is to be used, the
remote operation change-over signal
must occur before activating the remote
operation command signal.
# Input Signals
Content
Output Signals
The input signal is approximately 5VDC, 10mA. Use a switch
or a relay contact with the minimum applicable load of this
value.
The input signal is approximately 5VDC, 10mA. Use a switch
or a relay contact with the minimum applicable load of this
value.
10
How to use
Customer Control Run
Change-over Switch
I n s t a l l t h e c u s t o m e r c o n t r o l r u n
change-over switch near the air
compressor.
Switch ON : Customer controlled
operation is running.
S w i t c h O F F : L o c a l o p e r a t i o n i s
running.
Remote Operation & Stop Switch
Install the remote operation & stop
switch for remote control.
Switch ON : Compressor is running.
S w i t c h O F F : C o m p r e s s o r h a s
stopped.
Remote Operation & Stop Switch
Install the remote operation & stop
switch for remote control.
Switch ON : Compressor is running.
S w i t c h O F F : C o m p r e s s o r h a s
stopped.
Remote Operation Change-over
Switch
Install the remote operation change-
over switch near the air compressor.
Switch ON : Remote operation is
running.
S w i t c h O F F : L o c a l o p e r a t i o n i s
running.

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