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Note: The same MV limits apply during auto-tuning. The MV limits do not apply to manual control, MV when control is
stopped, MV sensor failure, and initial manual control. The MV upper / lower limit configuration is not available in the ON /
OFF standard control mode (heating or cooling control).
5.5.5 MV Settings for Sensor Break Error
[OPEN] [PAR5 → ErMV]
In the event of an open sensor error, the output value of the controller can be set to a predefined
MV
value instead
of ON / OFF or PID control. Ignores the
MV
based on the ON / OFF or PID control and sends a control value based
on the specified
MV
. Default setting: 0.0%
5.5.6 RAMP Settings
[PAR2 → RAMU/ RAMD/ rUNT]
The ramp is a function that configures the temperature per unit time to the Setpoint
(SV)
. The function limits the
rate of change of the Set Value
(SV)
and thus limits sudden temperature changes
(increase and decrease)
in
the control system.
The ramp is typically used in applications where rapid temperature changes
(increase and decrease)
can adver-
sely affect the controlled system.
Control is based on the changed
SV (hereafter: RAMP SV)
– based on the preset rate of change
(temperature
changing per unit time)
. The RAMP uplink rate and the RAMP downlink rate can be configured independently.
Parameter Description / Range
Default
RAMU
Setting for RAMP-UP change rate
0 °C / °F / Digit
RAMD
Setting for RAMP-DOWN change rate
rUNT
RAMP time unit
(SEC / MIN / HOUR)
MIN
Note: Activating the RAMP function when RAMP is not operating limits the Set Value (SV) rate of change based on the
Process Value (PV). Changing the SV or RAMP parameters during RAMP operation limits the rate of change of SV based
on SV at the time of change.
The alarm occurs during the RAMP based on the final SV. Setting the RAMP rate to 0 turns off the RAMP functi-
on. When the RAMP function is on, RAMP
SV
appears in the
SV
display area.
RAMP depending on operating status:
Operation
Ramp UP/DOWN
Ramp
All operations
When 0
Inactive
OPEN, HHHH, LLLL, auto-tuning, switching from Auto to Manual,
switching from Run to Stop
Regardless of status
Inactive
OPEN, HHHH, LLLL, after Auto-tuning has finished,
PV
= SV
Regardless of status
Inactive
Switching ON,
SV
change, switching from Stop to Run, switching from
Manual to Auto, Ramp rate change
When not 0
Active