
3500/42 Operation and Maintenance
Configuration Information
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Nonlatching
When an alarm is active, it will go inactive as soon as the proportional value
is no longer in alarm.
Alert is the first level alarm that occurs when the transducer signal level
exceeds the selected value. Danger is the second level alarm that occurs
when the transducer signal level exceeds the selected value. The Alert and
Danger values are set on the Setpoint screen.
Barriers
Select the MTL 796(-) Zener External option, or Galvanic Isolators if external
safety barriers are connected between the monitor and the transducer. If
using an Internal Barrier I/O Module, select the internal option. These
devices are used to restrict the amount of energy that can flow into a
hazardous area.
OK Mode
Latching
If a channel is configured for Latching OK, once the channel has gone
not OK the status stays not OK until a reset is issued. See page 47.
Nonlatching
If a channel is configured for Nonlatching OK, the OK status of that
channel will track the defined OK status of the transducer.
Timed OK Channel Defeat
An option that prevents a channel from returning to an OK status until that
channel's transducer has remained in an OK state for the specified period of
time. If the option is enabled, the time is set to 30 seconds. This option prevents
false trips caused by intermittent transducers.
3.1.7
Velocity Channel Options
This section discusses the Configuration Considerations and the Rack
Configuration Software screens associated with the Velocity Channel.
3.1.7.1
Velocity Channel Configuration Considerations
Consider the following items before configuring a Velocity Channel:
- Internal Barrier I/O Modules are not currently supported with 9200, 47633,
86205, and non-standard 2-wire seismoprobes.
- The "No Keyphasor" option is automatically selected for this channel type. No
Keyphasors are required.
- The Velocity Direct full-scale range is dependent upon the transducer type.
- When a full-scale range is modified, readjust the setpoints associated with this
proportional value.
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