Pumps and towers support several alarm options. The following table shows the various subsystems and their supported alarms.
|
Subsystem |
Alarm Type | |||
|---|---|---|---|---|
|
Frequency Converter Fault |
Motor Overload Tripped |
Belt Alarm |
Vibration |
|
|
Primary Chilled Water Pump |
Variable Speed Pumps Only |
Constant Speed Pumps Only |
Yes |
No |
|
Secondary Chilled Water Pump |
Yes |
No |
Yes |
No |
|
Condenser Water Pump |
Yes |
Yes |
Yes |
No |
|
Cooling Tower |
Variable Speed Fans Only |
Constant Speed Pumps Only |
Yes |
Yes |
Some alarms are only supported for specific equipment types. For example, the frequency converter fault alarm is only available for variable speed devices. The motor overload tripped fault alarm is only supported for constant speed pumps and cooling tower fans.
The Setup Input Modes of Operation table describes the four Setup input modes of operation. The setup determines what is done with the comparison between the command and status, or if it uses the status. The Additional Inputs table provides descriptions of the Delay and Maintenance Switch.
| Mode of Operation | Description |
|---|---|
| None | The device does not have any status input, and the module routes the command through the primitive to the OffOn output. The primitive does not check for a mismatch between the command and status inputs. |
| Status | The device does have status feedback, and the Device Status input is used for the OffOn output. The primitive does not check for a mismatch between the command and status inputs. |
| Automatic Restart | The device does have status feedback, and the Device Status input is used for the OffOn output. The primitive checks for a mismatch between the command and status. The primitive disables the device if the command and status are mismatched longer than the delay times. This mode allows the primitive to correct itself when the mismatch is corrected. The primitive has properties for the maximum number of retries allowed before user intervention is required; for example, Reset. It also has a Retry Interval property for setting the time to wait after a retry before attempting to start the device again. |
| Manual Restart | The device does have status feedback, and the Device Status input is used for the OffOn output. The primitive checks for a mismatch between the command and status. The primitive disables the device if the command and status are mismatched longer than the delay times. This mode requires manual reset to enable the device. |
| Input | Description |
|---|---|
| Output Delay | The maximum amount of time the status and command may mismatch before the device is disabled. This forgiveness time is used when a device is turning on or a device is turning off. |
| Lost Status Delay | This input is similar to the Output Delay, but it is used after the device was commanded on, status was confirmed, but later lost. For Chiller Interlocks, this input may be set to a longer time than the output delay to allow a chiller to recover from low load recycle without disabling the chiller, but must be short enough to bring on a new chiller if the chilled water temperature begins to rise. For Pumps and towers, this time delay should be the same as the Output Delay. |
| Maintenance Switch | This input provides a Binary Input to disable or enable the controlled device. |