Yamatake SDC35, Руководство пользователя

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5-18
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
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ON/OFF control
The ON/OFF control related items can be set.
• [Differential (for ON/OFF control): dIFF] and [ON/OFF control action point
offset: oFFS] can be displayed and set when the control method is the ON/OFF
control (CtrL = 0).
• The following Figure shows the operation of the ON/OFF control:
●
shows that the ON/OFF is changed at this value.
❍
shows that the ON/OFF is changed at a point that "1U" is added to this
value.
• The following describes examples showing how to use the ON/OFF control
action point offset:
To turn OFF the output at 205˚C or more and turn ON the output at less than
190˚C with the heat control and SP = 200˚C, the differential is set to 15˚C and
the offset is set to 5˚C.
To turn OFF the output at 5˚C or less and turn ON the output at more than 10˚C
with the cool control and SP = 10˚C, the differential is set to 5˚C and the offset is
set to -5˚C.
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Output variation limit
Variation in the manipulated variable (MV) can be limited.
• The upper limit (%) for the absolute value of MV variation can be set in 1s
intervals. However, because the sampling cycle is 0.1s, the actual MV variation
is limited to 1/10 of the value set. For example, when 5.0(%/s) is set, the
variation per 0.1s is limited to ±0.5%. In addition, when 0.1(%/s) is set, the
variation per 0.1s is limited to ±0.01%.
• When 0.0 is set, there is no limit on MV variation.
• When the model is a motor drive relay output type with a motor long life mode
(C59 = 1), display and setting are not possible because the MV variation limit
function operates automatically.
Item (Bank) Display Contents Initial value User level
Differential (for ON/OFF
control) (Parameter bank) 0 to 9999U 5U Basic,
Standard,
High function
ON/OFF control action
point offset (Parameter
bank) 0U High function
-1999 to +9999U
SP + oFFS
Heat control (Reverse action) Cool control (Direct action)
PV
ON
dIFF
SP + oFFS
PV
ON
dIFF
Item (Bank) Display Contents Initial value User level
Output variation limit
(Parameter bank) 0.0: No limit
0.1 to 999.9% 0.0 High