Yamato Scientific Hitech controller type Ⅳ - Manual (Page 29)

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3.6 Hold Function 3.6 Hold Function 3.6 Hold Function 3.6 Hold Function
Hold function is the one of functions that the HitecⅣcontroller supports by using the
MODE key.
It can work only if the setting time of the operation start time of the Auto-Start
operation and the Program operation and the operation stop time are not set in
hours but in a period of time.
General Description of the Hold Function General Description of the Hold Function General Description of the Hold Function General Description of the Hold Function
Once the Hold Function is on, immediately the HitecⅣcontroller stops the built-in
timer and keeps the condition. The definite examples are shown below.
1. When the Hold Function activated while the unit is in standby condition of starting
operation, the waiting time to start is extended by a period of time when the Hold
Function was on
2. When the Hold Function activated while performing the fixed gradient rate operation
toward the desired temperature, the controller stops the gradient operation and
changes to the fixed temperature operation to keep the internal target temperature of
the controller at the point of time. ( The internal target temperature is not always same
as the ramp level in the program segment) Once the Hold Function is off, the
controller resumes performing the gradient operation that had been performed just
before the Hold Function was on.
3. When the Hold Function activated while performing the gradient operation with full
power, the controller changes to the fixed temperature operation to keep the chamber at
the ramp level in the program segment after reaching the ramp level (the desired
temperature)
4. When the Hold Function activated while keeping the chamber at the ramp level, the
setting soak time in the Auto-Stop operation and the Program operation are extended
by a period of time when the Hold Function was on
5. When you change a certain ongoing operation to the other operation by pushing
the MENU key with the Hold Function is on, the Hold Function is automatically
released at the point of time when the operation is changed.