Hazardous areaSafe areaMTL5521 FREQUENCY TOCURRENT CONVERTERAND TRIP AMPLIFIER
The MTL5521 converts a frequency or rotational speed signal from aproximity detector located in the hazardous area into a 0/4–20mA current signal suitable for driving safe area loads. A display located on the top indicates the frequency.
The analogue output provides either a 0–20mA or 4–20mA signalthat is proportional to the rotational speed or frequency of the input. A relay output is provided, with two configurable set points, allowingmonitoring of the input frequency. When the input frequency is withinthis window the relay is energised and a yellow LED is illuminated. A start-up delay is triggered by a NO contact allowing the system tostart up without creating false alarms.
Configuration settings are made by two push button switches located on the front of the unit allowing the following parameters tobe displayed and configured:
•••••••
Output current either 0–20mA or 4–20mA0/4mA and 20mA frequency values
Line fault detection: Off, wire-break and/or short circuitUpper and lower threshold values of the set point relay (including hysteresis)
Start uptime delay 0 to 1000sFilter time constantScaling factors
NAMURSensor12345678910111213+LoadV or I–Vs+Vs–**141516Start updelay** see 'Power supply' for optionsTerminal56789101112131516FunctionNamur Sensor +veNamur Sensor –veStart up delay +veStart up delay –ve0/4–20mA output +veSpeed MonitorSpeed MonitorSpeed Monitor0/4–20mA output –veSupply +veSupply –veA line fault detect facility detects open and/or short circuits in thefield. When a fault is detected the relay de-energises and the yellowLED changes to red.
SPECIFICATION
Number of channels
One, with a configurable alarmLocation of delay switch
Zone 0, IIC, T6 hazardous areaDiv. 1, Group A hazardous locationLocation of proximity detector
Zone 0, IIC, T4–6 hazardous area if suitably certifiedDiv. 1, Group A hazardous location
Hazardous-area input (Rotation sensor)
Frequency input0 to 10kHzPulse width20µsStart-up delay0 to 1000s (adjustable)Input circuitsInput conforms to NAMUR/DIN 19234Voltage applied to sensor
8.2V from 1kΩ
Input characteristics
Switching threshold1.55mAOpen-circuit threshold<0.1mAShort-circuit threshold>6mASafe-area outputSignal range0/4 to 20mASafe-area load resistance0 to 500ΩFilter time constant0 to 60s in 80ms incrementsRelay typeSingle-pole changeover relayRelay characteristicsSwitching voltage<250V ac/120V dcSwitching current<2ASwitching capacity<500VA/60WLED indicatorsGreenPowerYellow K1Set point relay statusYellow (Red)Pulse indication (fault)Power supply
230V ac nominal, 184–264V ac, 48–62Hz(MTL5521-11-230)115V ac nominal, 98–126V ac, 48–62Hz(MTL5521-11-115)24V dc nominal, 19–29V dc, <10% ripple(MTL5521-11-24)Power consumption
<5VA/5WIsolation
250V rms between input, output and power supply terminals,tested at 2.5kV rms between safe and hazardous terminalsTerminals
Each terminal will accommodate 2x2.5mm2conductorsMounting
On 35mm (top hat) railLocation of units
Safe area
Ambient temperature limits
Operating temperature–20°C to +60°CDimensions
Height (above rail)105mmWidth89mmRail length required36mmSafety description
13V, 30mA (terminals 5–8)Um= 250V ac
DIMENSIONS (mm)13141516936101112DisplayPwrK1S1S28951627384110EUROPE (EMEA)Tel: +44 (0)1582 723633 Fax: +44 (0)1582 422283AMERICASTel: +1 603 926 0090Fax: +1 603 926 1899ASIA PACIFICTel: +65 487 7887Fax: +65 487 7997E-mail: enquiry@mtl-inst.com Web site: www.mtl-inst.com
June 2004
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