6 Parameter Settings and Functions
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6.2.4 Auto/Manual control settings
Auto control mode is to make temperature reach SV with MV calculated by PID control. Manual
control mode is to make temperature reach SV with user’s defined MV.
When in manual control mode, parameter settings can only be viewed and cannot be modified
(except for lock parameters). When digital input terminal function is set as Auto/Manual control,
the key (the key for TK4N, TK4S, TK4SP) and the Auto/Manual swithcing by
communication do not operate. When the unit is powered on following a power interruption or
shutdown, previous control mode (auto or manual) will be maintained.
If switching to manual control during Auto-tuning, Auto-tuning will be terminated. It is still possible
to switch to manual control mode while in STOP. When a sensor break alarm [SBA] occurs in
standard control mode, the sensor error MV [ErMV] is applied. In this state, manual and auto
control MV settings can be modified. It is still possible to switch auto/manual control mode while
in controlling operation.
Operation Priority: Manual Control > Stop > Open (Sensor Disconnection)
6.2.4.1 Manual/Auto control switching
(1) Manual control switching for standard control (heating or cooling control)
①, ⑤: When in RUN mode, press the key (the key for TK4N, TK4S, TK4SP
model) and it enters MV monitoring mode. The SV display shows H (heating control) or
C (cooling control), and shows MV to indicate the start of MV monitoring.
②, ⑥: If the is pressed when MV monitoring is in progress, the MAN
indicator comes on and the lowest digit (10
0
digit) starts to flash, indicating activation of
manual control.
③, ⑦: Press the key to change the flashing digit (10
0
→ 10
1
→ 10
2
→ 10
3
→ 10
0
).
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