7.2. Connection
7.2.1. Plug in the temperature probe to the 5 pin DIN socket. Place the temperature probe
into the sample ensuring that at least 40mm of the probe tip is in contact with the
sample. Ensure the temperature probe is correctly plugged into the 5-pin DIN socket at
the rear of the CN-200D Controller.
Note:
Should the temperature probe become disconnected or fail open circuit,
the display will indicate “or” and a dot next to the alarm symbol will illuminate.
7.2.2. Connect the IEC output plug to your heating apparatus as illustrated.
7.2.3. Connect to the mains electricity supply. Turn on using the On / Off Power switch. The
amber neon will illuminate when power is being supplied to the output. Depending on
the operating mode, the amber neon may be on continuously, or switch on and off.
7.3. Control Modes Explained
7.3.1. Basic On / Off Controller
The On / Off controller output has only two states. Fully on and fully off. Fully on
is when the temperature is anywhere below set point, and fully off, when the
temperature is anywhere above the desired set point.
7.3.2. On-Off Controller plus Hysteresis
To prevent detrimental control chattering as the temperature crosses the set point, an
On / Off differential or ‘hysteresis’ can be added to the controller function.
When a hysteresis value is entered (for example, say 3°C), the controller will switch off
once the set point temperature has been reached and will not switch back on again
until the measured temperature falls 3°C below the set point.
For example, in a heating application, with a 150°C set point and a 3°C hysteresis value
entered, the controller will switch off at 150°C (there may be some overshoot) and will
not come back on again until the temperature falls to 147°C.
The hysteresis figure should be set to give improved control of temperature without
excessive chatter. The amount of hysteresis determines the minimum temperature
variation possible, although process characteristics will add to this differential.
On / Off functions are only accurate when the heating mass is relatively large, and the
heater will cause overshoot and wide variations in temperature.
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Page 11 of 24 M6493 Issue 10.3
7.2. Connection.
7.2.1. Plug in the temperature probe to the 5 pin DIN socket. Place the temperature
probe into the sample ensuring that at least 40mm of the probe tip is in contact
with the sample. Ensure the temperature probe is correctly plugged into the 5-
pin DIN socket at the rear of the MC810B Controller.
Note:
Should the temperature probe become disconnected or fail open circuit,
the display will indicate
“or”
and a dot next to the alarm symbol will illuminate.
7.2.2. Connect the IEC output plug to your heating apparatus as illustrated.
or
7.2.3. Connect to the mains electricity supply. Turn on using the On / Off Power
switch. The amber neon will illuminate when power is being supplied to the
output. Depending on the operating mode, the amber neon may be on
continuously, or switch on and off.
7.3. Control Modes Explained.
7.3.1. Basic On / Off Controller.
The On / Off controller output has only two states. Fully on and fully off. Fully
on is when the temperature is anywhere below set point, and fully off, when
the temperature is anywhere above the desired set point.
7.3.2. On-Off Controller plus Hysteresis.
To prevent detrimental control chattering as the temperature crosses the set
point, an On / Off differential or ‘hysteresis’ can be added to the controller
function.
When a hysteresis value is entered (for example, say 3°C), the controller will
switch off once the set point temperature has been reached and will not
switch back on again until the measured temperature falls 3°C below the set
point.
For example, in a heating application, with a 150°C set point and a 3°C
hysteresis value entered, the controller will switch off at 150°C (there may be
some overshoot) and will not come back on again until the temperature falls
to 147°C.
The hysteresis figure should be set to give improved control of temperature
without excessive chatter. The amount of hysteresis determines the minimum
temperature variation possible, although process characteristics will add to
this differential.
On / Off functions are only accurate when the heating mass is relatively large,
and the heater will cause overshoot and wide variations in temperature.
