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The air compressor will operate normally in its selected mode whenever this contact is closed (turned on).
Note that the keypad is always the master control; the operating mode must be selected at the keypad,
and the remote is not capable of starting a unit after the [STOP/RESET] key has been pressed to place
the controller in the READY state. When the contact is opened (turned off), operation depends on how
the controller has been programmed and what it is doing prior to opening the contact.
If the compressor was already stopped in automatic or sequence modes, it will remain stopped and will
not restart until the contact is closed. The display will flash the message "REMOTE HALT" to indicate
that it is waiting for the remote signal.
If the compressor was running in any mode when the contact was opened, and the remote response is
programmed for "IMMEDIATE", the compressor will immediately unload, and will run only until the
reservoir is blown down. Then the motors stop, and the unit will be in the "REMOTE HALT" mode as
indicated above.
If the compressor was running in any mode when the contact was opened, and the remote response is
programmed for "TIMED UNLOAD", the compressor will immediately unload and blowdown. It will then
continue to run unloaded for whatever period has been programmed for "AUTO TIME" (or will complete
the remaining auto time if already blown down). The controller displays "REMOTE UNLOAD" during this
period. After completion, the motors will stop, and the unit will be in the "REMOTE HALT" mode as
indicated above.
When the remote is turned back on, the unit will start immediately in the CONSTANT or LOW DEMAND
modes. Loading in these modes, or starting in AUTO or SEQUENCE modes will occur when the
pressure drops below the load pressure.
Alarm Relay -
The controller is provided with an alarm relay which may be connected to a remote
mounted indicator light, horn, or into a PLC input of a plantwide control system. The contact is
commercial rated 2 amps at 120 volts. The relay is turned on whenever there is a SHUTDOWN condition
requiring service at the compressor, and remains off during normal operation, stopping, or power off
conditions. The external connections from the controller are from an isolated form C (single-pole, double-
throw) contact. This allows control of either a "compressor okay" or a "compressor shutdown" remote
indicator.
To use this relay, connect the supply wire for the remote circuit to terminal 21 (relay common) on the
terminal strip. Connect a wire to the indicator from either terminal 19 (normally open) or from terminal 20
(normally closed). Connect the other side of the indicator to its neutral.
Serial Communications -
The RS-232 port is available for serial communications of compressor data to
external monitoring systems at any time. If units are NOT connected in sequence, the RS-485 port may
be used for multi-drop communications of compressor data to external monitoring systems. Data
available include all pressures and temperatures, and a report of internal service data. This is accessible
with a PC or PLC with an appropriate communications port. For protocol information, request drawing
303EBC1255.
Wiring Diagrams -
The following wiring diagrams show connections in typical units. Refer to the wiring
diagram shipped with the compressor unit for actual connections.
Summary of Contents for AUTO SENTRY RS2000
Page 11: ...13 8 623 Page 7 Figure 3 1 FLOW CHART FOR SETUP PROGRAMMING V4 xx 300EBC1255 E Ref Drawing...
Page 21: ...13 8 623 Page 17 300EFC546 A Ref Drawing Page 1 of 2 Figure 3 2 TYPICAL WIRING DIAGRAM V4 xx...
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Page 30: ...13 8 623 Page 26 FIGURE 4 2 TYPICAL WIRING DIAGRAM V6 xx 303EFC546 A Ref Drawing Page 1 of 2...
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