Relay Timeout Alarms; Analog Alarms; Failsafe Mode; Startup Mode - Nalco 3D TRASAR Series Installation And Operation Manual

Control Alarm
Settings Settings

4.11.6 Relay Timeout Alarms

Relay Timeout Alarms are safety alarms activated when a relay has been energized for longer than
the entered Pump T imeout Limit. In Startup Mode, the Pump T i meout Limit is extended by the
Startup Factor.
• TRASAR Relay Timeout
• Tagged Polymer Relay T imeout
• Bio-reporter Relay Timeout
• Oxidizing Biocide Relay T imeout
4.11.7 Analog and Digital Alarms
Analog Alarms are for the 4-20 mAinputs. The high and low limits are settable in scaled units (rather
than mA values). Digital input alarms are dry contacts that can be set by the user in the
Configurator. These alarms do not affect any of the control relays and are for information only
• Analog #1 High
• Analog #1 Low
• Analog #2 High
• Analog #2 Low

4.11.8 Failsafe Mode

When alarms are activated, the affected control relays will operate in Failsafe Mode. In Failsafe
Mode, the relay is operated in a cycle of on-time and off-time as determined by the failsafe duty .
For each relay, the user can select "Fixed Failsafe" and input the desired relay failsafe duty . The 3D
TRASAR controller also offers the option of "Smart Failsafe", in which the failsafe duty is calculated
from the actual relay operation under normal conditions. W ith this option, the calculated failsafe duty
can vary as relay usage changes. On initial startup or after erasing the datalog, the Smart Failsafe
Duty must be learned by the controller , which it does automatically after the first 7 days. The first 7
days' values are ignored to avoid skewed values as a result of extreme startup conditions. During
the first 7 days, each relay will use an initial fixed failsafe duty . This fixed failsafe duty is also logged
as the actual relay duty to indicate that the learning is in progress. The Smart Failsafe Duty is
calculated as the median of the previous 7 days' relay duty values.

4.11.9 Startup Mode

When a system is first started up with a new product, it is often desirable to suppress alarms for a
period to allow the 3D TRASAR controller to bring the system under control. See section 4.5.4.
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5500 - Installation & Operation Manual
Information
System
Info
• Blowdown Relay Timeout
• pH Relay Timeout
• Pellet Feeder Timeout
• Digital #3 On or Off
• Digital #4 On or Off
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