Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 271)

Publication 900-UM007D-EN-E - January 2011
Parameter Functions & Definitions 5-43
MV Lower-Limit
The configurable ranges allowed during the standard control and heating and
cooling control modes are different.
The manipulated variable at the cooling Control Output side during heating
and cooling control is expressed as a negative value (refer to Table 5.AX).
Related Parameters
• PID ON/OFF (Initial Setting function group, page 5-55)
• ST (Initial Setting function group, page 5-56)
MV (Manipulated Variable) Change Rate Limit,
Condition of Use: 2-PID control must be used. ST must be OFF.
Function: The MV Change Rate Limit parameter allows you to configure the
maximum allowable rate of change variation in the MV per second. If the
current rate of change in the MV exceeds this setting, the MV will be changed
to the configured MV change rate limit until the calculated value is reached. If
the limit is set to 0.0, this function will be disabled.
The MV Change Rate Limit parameter will NOT operate in the following
situations.
• In manual mode
• During ST execution (Cannot be set when ST is ON.)
• During AT execution
• During ON/OFF control
• While stopped (MV output during STOP)
• During MV output when error occurs
Table 5.AX
Control Mode Configurable Range Units Default Value
Standard MV Upper-Limit –5.0…–0.1 % –5.0
Heating and cooling –105.0…+0.0 % –105.0
Table 5.AY
Configurable Range Units Default
0.0 to 100.00 %/s 0.0
orl