Instruction Manual
Microprocessor Temperature Regulator HT MC11
Page 8 of 22
6.2 Heating Current Monitoring (Option)
If the heating current monitoring option is used, no free signal contact is
available.
Alarm is active, if
• leakage current (current when solid state relay is switched off) > 0.3 A
or
• measured heating current falls below value set in parameter AL 1 .
Heating current is measured at fixed intervals (set with parameter Cu. C y in s). Al-
ternately, heating current (output active) and leakage current (output switched off,
leakage current of SSR or RC circuits) are measured. During measurement the output
is switched on respectively off for approx. 100 ms independently of the control loop.
If a leakage current > 0.3 A is detected, the alarm is activated and E r .C u is dis-
played, because there is probably a short-circuit at the switching element. We rec-
ommend defining an alarm delay to avoid false alarm caused by short-term mains
voltage fluctuations.
The actual current value is displayed in parameter Cu r on the operating level. By
pressing key "" the leakage current is displayed.
6.3 Analog Input/Output 0...10 V DC (Option)
1. The analog output works as a process value output.
The output voltage value (range 0 … 10 V) corresponds to the measurement range
(min. measuring range value … max. measuring range value) of the selected control
sensor.
2. The analog output works in output ratio mode
The output ratio is used e.g. for thyristor control (see page 9 O u t . H ). Connection
via connection board terminal 24+35.
6.4 Setpoint Adjustment 0...10 V DC (Option)
The measured voltage value 0 … 10 V is converted corresponding to the measure-
ment range (min. measuring range value … max. measuring range value) and used
as setpoint. External setpoint adjustment is activated by setting parameter C o. S P =
S P . E (see page 11).
6.5 Potential-Free Switching
Separate power supply of temperature regulator electronics and heating circuit is
possible.
Temperature regulator electronics: standard operating voltage U = 230 V AC
Heating circuit: operating voltage 24 V … 250 V AC,
switching power 10 A or 15 A
depending on model
7 Before First Operation
The housing cover of the regulator must be closed and cable glands must be
checked before switching on the device. Only then the protection guarantee of
the regulator is ensured.
If the start-up characteristics of the heating are not sufficiently known, you are ur-
gently advised to observe the temperature profile carefully during first operation to
avoid overshoots of the heating.
Version 1080/1.03 02/2018
471 10 1400
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