Future Design MCTB 4.3, User Manual

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MCTB
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4.2.36 Ramp Rate Operation
(MCTB 4.3” version 4MA V1.3 only)
The Ramp Rate Operation selection is used to enable single set point ramping for the loop. This allows the user
to adjust the rate at which the system responds to a set point change. It can be used to reduce thermal shock
to a product by controlling the rate of change in temperature for example, when going from one set point to
another.
Once the desired mode has been selected, press the “Done” button to return to the main Loop
Configuration screen.
The
Disabled selection turns ramp rate operation off. When ramp rate is not enabled, the loop act as a single
set point control, meaning that as each set point is entered, the system will attempt to achieve and control to
that set point as quickly as possible.
The
Ramp in U/min selection enables ramp rate operation. When enabled, limits of entry can then be
configured (see following sections) for the minimum and maximum rate of change the set point is permitted to
make in units per minute. The user is then provided fields of entry on the set point Limits screen (see section
9.3 Setpoint Limits ) in the runtime. This allows the user to adjust the rate at which the set point will ramp from
the current process value to each set point entered.
The
Ramp in U/hr selection enables ramp rate operation. When enabled, limits of entry can then be configured
(see following sections) for the minimum and maximum rate of change the set point is permitted to make in
units per hour. The user is then provided fields of entry on the set point Limits screen (see section
9.3 Setpoint
Limits ) in the runtime. This allows the user to adjust the rate at which the set point will ramp from the current
process value to each set point entered.
4.2.37 Ramp Rate Down Low/Upper Limit
(MCTB 4.3” version 4MA V1.3 only)
The ramp rate down low and upper limit entries are used to define the minimum and maximum ramp rate the
user can set for the rate of change of the loop set point under ramp rate operation when the set point is below
the current process value. The low limit can be set from 0 up to the upper limit. The upper limit can be set from
the low limit value up to 5000 for units of degrees Centigrade or 9000 for units of degrees Fahrenheit or linear
inputs.
NOTE:
The minimum and maximum scale values are limited by the decimal point selection. For a decimal
of 0, the values are 0-5000°C (0-9000°F). For one decimal point, the values are 0.0 and 500.0°C (0.0
and 900.0°F). For two decimal digits (liner inputs), the values are 0.00 and 90.00 and for three
decimal digits the values are 0.000 and 9.000.