Rockwell Automation T8442 Trusted TMR Speed Monitor - Manual (Page 25)

Trusted
TM
Module T8442
Issue 8 Apr 10 PD-T8442 25
3.1.1. Number of Teeth
This field can be set for each of the three input channels within a group.
The input value configures the number of teeth on the speed sensor gearwheel. It is used to scale the
reported rotational speed in RPM.
The range of values that can be used for this field are 0 to 1000. The default value is zero.
If the number of teeth is set to zero, the channel will be considered disconnected and at zero speed.
When the digital pulse train signal is 1/3
rd Hz or less the input is considered to be at “zero speed”. Zero
speed is required for all inputs in a group in order to modify certain configuration settings.
The configuration will appear in the speed monitor configuration template as:
TEETH
3.1.2. Minimum Speed
This field can be set for each of the three input channels within a group.
The input value configures the minimum speed below which channel discrepancy reporting is inhibited.
The FMIN units are RPM.
The range of values that can be used for this field are 0 to 30000. The value must be less than or
equal to the Over-Speed Limit. The default value is 0, meaning the channel speed is always factored
into the discrepancy reporting for the group. This configuration variable is needed for sensors, such as
variable reluctance magnetic pickups that do not operate down to DC.
The configuration will appear in the speed monitor configuration template as:
FMIN
3.1.3. Over-Speed Limit
This field can be set for each input group.
The input value configures the over-speed threshold ceiling in RPM. This defines the maximum over-
speed threshold level that can be set through the application interface. The over-speed output will trip
when the speed is greater than, or equal to, the configured threshold.
The range of values that can be used for this field are 0 to 30000. The default value is zero.
If the limit is set to zero, the over-speed trip threshold for the group will be disabled (i.e. it will always be
tripped).
The configured limit may only be increased if the group is at zero speed.
The configuration will appear in the speed monitor configuration template as:
OSL
3.1.4. Over-Speed Test Limit
This field can be set for each input group (see also Over-speed Test Timeout). The input value
configures the over-speed test threshold ceiling in RPM. This defines the maximum over-speed test
threshold level that can be set through the application interface.
The range of values that can be used for this field are 0 to 30000. The default value is zero.
If the limit is set to zero, the over-speed test threshold for the group will be disabled (i.e. always tripped
when Over-Speed Test mode is enabled).
The configured limit may only be increased if the group is at zero speed.
The configuration will appear in the speed monitor configuration template as: OST