6. OPERATIONS OF THE BASIC FUNCTIONS
6-20 IMR02C15-E4
6.5 Auto/Manual Transfer
The Auto/Manual transfer can be made by digital input (DI) * or communication * other than the key
operation.
* Optional
For details of Auto/Manual transfer by communication, refer to the Communication
Instruction Manual (IMR02C16-E).
îš„ Bumpless function with Auto/Manual transfer
 When the instrument is switched from Manual (MAN) mode to Auto (AUTO) mode
When the instrument is switched from Manual (MAN) mode to Auto (AUTO) mode, the instrument
determines the state of the Measured value (PV) and performs the following processing:
− If the Measured value (PV) is within the Proportional band [heat-side] or the Proportional band
[cool-side], the Bumpless function will be activated.
− If the Measured value (PV) is outside of the Proportional band [heat-side] or the Proportional
band [cool-side], the Bumpless function will not be activated.
− When Heat/Cool PID control is performed, the Bumpless function will work as described below
depending on the preset Manual manipulated output value (MV):
When the Manual manipulated output value (MV) is a positive value:
The Bumpless function results in heat-side output.
When the Manual manipulated output value (MV) is a negative value:
The Bumpless function results in cool-side output.
 When the instrument is switched from Auto (AUTO) mode to Manual (MAN) mode
It can be set whether the Bumpless function is ON or OFF when the instrument is switched from Auto
(AUTO) mode to Manual (MAN) mode. The following processing is performed depending on
Bumpless function ON or OFF.
− If the Bumpless function is set to OFF, the preset Manual manipulated output value (MV) will
be output.
− If the Bumpless function operates is set to ON, the Manipulated output value (MV) of Auto
(AUTO) mode will be maintained as the output of Manual (MAN) mode.
− When Heat/Cool PID control is performed, the Bumpless function will work as described below
(When the Bumpless function is valid (ON))
When heat-side output is output in Auto (AUTO) mode:
The Bumpless function results in the Manual manipulated output value (MV) to be a positive
value.
When only cool-side output is output in AUTO mode:
The Bumpless function results in the Manual manipulated output value (MV) to be a
negative value.
When the heat-side output and cool-side output are both 0 or less than 0 % in AUTO mode:
The Bumpless function results in the Manual manipulated output value (MV) to be 0 %.
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