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MKS/TKS General Purpose Controller


TECHNICAL SPECIFICATION
Case: Polycarbonate
Self extinguishing degree According to UL 746 C. Front protection: designed and tested for IP65* and NEMA 4X* for indoor locations (panel gasket installed). *According to IEC 529, CEI 70-1 and NEMA 250-1991 STD
Weight: 360 g max. for TKS - 490 g max. for MKS
Power supply (switch mode): from 100 to 240 Vac, 50/60
Hz (+10 % to -15 % of nominal)
or 24 Vac/Vdc (+10 % of nominal)
Power consumption: 6 W max
Common mode rejection ratio > 120 dB @ 50/60 Hz
Normal mode rejection ratio: > 60 dB @ 50/60 Hz
Electromagnetic compatibility and safety requirements: This instrument is marked CE and conforms to council directives 89/336/EEC (reference harmonized standard EN 50081-2 and EN 50082-2) and to council directives 73/23/EEC and 93/68/EEC (reference harmonized standard EN 61010-1)
Installation category: II
Sampling time: 250 ms for linear inputs; 500 ms for TC or RTD inputs
Accuracy: +0.2% f.s.v. @ 25°C (77 °F) and nominal power supply voltage
Operating temperature: from 0 to +50°C
Storage temperature: from -20 to +70°C
Humidity: from 20% to 85% RH non-condensing

Measuring Inputs
Thermocouples
Burnout: Detection of the open input circuit (wires or sensor) with underrange or overrange selectable indication
Cold junction: automatic compensation between 0 and 50°C ambient
Cold junction compensation error: 0.1°C/°C
Calibration: according to IEC 584-1
 
Linear input (mA e V)
Readout: keyboard programmable from -1999 to 4000
Decimal point: programmable to any position
 
RTD input
Type: Pt 100 3 wire connection
Calibration: according to DIN 43760
Line resistance: Max 20 W/wire with no measurable error
Burnout: etection of the sensor open circuit and of one or more wires open circuit. Short circuit indication sensor resistance is lower than 12 W

Control Action
Algorithm: PID + SMART Tune
Integral preload:
- for one control output, from 0 to 100% of the output range
- for two control outputs, from -100% to +100% of the heating/cooling output range.
Relative cooling gain: from 0.20 to 1.00 referred to the proportional band
Overlap/deadband: from -20% (deadband) to +50% (overlap) of the proportional band
Output limiters: (for main or secondary control outputs):
- output high limits
- output low limits
- output max. rate of rise
Types:
- one control output (heating)
- two control outputs (heating and cooling).
Proportional band: for MKS/TKS relay the proportional band is programmable from 1.0% to 100.0% of input span.
For MKS/TKS mA and Servo the proportional band is programmable from 1.0% to 200.0% of input span. For all models, setting the PB equal to 0 causes the control action to be ON/OFF
Hysteresis (for ON/OFF control action): from 0.1% to 10.0% of input span
Integral time: from 1 second to 20 minutes (or excluded)
Derivative time: from 1 sec. to 10 minutes (or excluded)

Alarms
Alarm action: direct or reverse (programmable)
Process alarm
Operating mode: minimum or maximum programmable. Threshold: programmable in engineering units within input range
Band alarm
Operating mode: inside or outside programmable
Threshold: low: from 0 to -1000 units
high: from 0 to +1000 units
Deviation alarm
Operating mode: high or low programmable
Threshold: programmable from -1000 to +1000 units
Alarm functions: each alarm can be configured as process alarm, band alarm, deviation alarm or process alarm on the output value
Alarm reset: automatic or manual reset programmable for each alarm
Alarm masking: each alarm can be configured as masked alarm or standard alarm
Hysteresis: programmable in engineering units from 1 to 200 digits

Serial Interface (Optional)
Type: Isolated RS-485
Byte format: 8 bit programmable
Stop bit: one
Address: from 1 to 255
Protocol type: MODBUS, JBUS, Polling or Selecting
Baud rate: programmable from 600 to 19200 BAUD

Output "Turn Off"
This function can be used to disable the control output (and make the instrument to work as an indicator)

Loop Break Alarm
The principle of this alarm is that, with a steady load and steady power output, the process rate of rise (deviation/time) is steady as well. Analyzing the process rate of rise of the two limit conditions (power output=0 and power output=100%), it is possible to estimate the two limits which define the correct process behavior.
Deviation: from 0 to 500 units
Timer: from 1 sec. to 40 min
Hysteresis: from 1% to 50% of the input span
Last Updated Friday, July 29, 2005