Watts AERCO Edge [ii] Operation Manual page 123

Edge [ii] Controller Operation Manual
SECTION 6 – ADVANCED SETUP
Main Menu → Advanced Setup → BST Cascade → Cascade
1. Go to:
parameters appear only if Unit Mode = BST Manager in
Configuration (see Step 3).
BST CLIENT SCREEN
Figure 6.3.2: BST Cascade: Cascade Communication Screens
2. Configure the following parameters on both BST Client and BST Manager screens:
Unit Address: The unit's address in the BST Cascade network. (Range: 1 to 16)
•
Cascade Baud Rate: Select the rate at which information is transferred in a
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communication channel: 9600, 19200, 38400, 115200 bits per second.
Plant Failsafe Mode: Specifies the plant's operating mode if there is a loss of
•
communication with BAS or external sensor (i.e., an outdoor temperature sensor),
either Constant or Shutdown. If the loss of communication is to the BST Manager
unit, this setting applies to the current unit. Plant Failsafe Mode applies to what the
entire plant does as a whole if it loses communication with the BAS or external sensor.
If set to Constant Setpt, the following additional parameter appears:
o Plant Failsafe Setpoint: Specifies the plant's setpoint if there is a loss of
communication with BAS or header sensor.
Network Timeout: The timeout value before a Modbus Fault is declared due to no
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response from the BST Manager unit or (if a Manager) from the BAS. (Range: 5 - 999)
Error Threshold: The number of Modbus Comm errors allowed before invoking a
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Modbus Comm Fault. (Range: 1 to 9)
Comm Error String: Displays the number of Comm errors on each Comm port
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(client unit). If no valid address is entered for a client unit, it displays "-" for that
address. The maximum number of error counts is 9.
SSD Address: The Client/Client Device address (for backwards compatibility).
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Time&Date Sync over BST: If enabled, the BST Manager's time and date are
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sent to all BST Clients units; all units in the cascade will then be synchronized.
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OMM-139_E 8/25/2020
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Comm. Two
Section 6.3.1: Cascade
BST MANAGER SCREEN
Page 123 of 196