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AERCO Control System (ACS)
CHAPTER 3
: Operation
11/22/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
Page 63 of 139
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Phone: 800-526-0288
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3.13.8 PASSTHRU WRITE
This is the enable/disable for the write functionality when MODBUS PASSTHRU is enabled in
the RS232 menu. When set to the default value, DISABLED, it will allow only reading of values
but no writing of values. To allow writing of any values, this must be set to ENABLED.
3.13.9 VALVE WAIT TIME
This value tells how long to wait for the hydronic valve to transition between open and closed.
The Valve End Switch status is not correct after this time expires, a fault message will be
displayed - VALVE POS ISSUE (Valve Position Issue).
3.13.10 SYSTEM OVERRIDE (Modbus Enable/Disable)
This is a Modbus Enable/Disable feature. It can only be accessed via the Modbus slave port
(RS232 port) on the ACS. It basically mimics the pressing of the On/Off front panel button. This
setting is located at Modbus Address 0x00A0 or 160. To override the system Off, you must write
204 to that address. To override the system On, you must write 51 to that address. Writing any
other number will be ignored.
The front panel switch would have top priority so that if it is switched Off by the front panel
button, it cannot be switched On by the modbus command. But if it is switched On by the front
panel button, it can be switched On and Off by the modbus command. Reading the status
would show “1” for On, “2” for Modbus Off, and “0” for Front Panel Off.
ACS QUICK-START GUIDE MENU
3.13
NOTE
The “Quick Start” procedures in this section (3.14) assume that
the user fully understands the ACS menu structure and is able to
navigate through these menus to display and change menu
options. Refer to paragraph 3.3 for menus and menu processing
procedures.
The following procedure assumes that you are programming a new ACS that has the “Factory
Default” settings currently stored in memory.
If you wish to restore a “Field-Programmed” ACS to the “Factory Default” values, go to the
CALIBRATION MENU and select the
RESET DEFAULTS
option. ALL SETTINGS, EXCEPT
TIME AND DATE, WILL RETURN TO THEIR FACTOR DEFAULTS.
This paragraph provides the instructions to quickly start up and operate the ACS in some of the
most commonly used modes. The ranges and default values of the Menu Options used in the
following instructions are summarized in Appendix A.