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Hazardous area
Safe area
MTL5521 FREQUENCY TO CURRENT CONVERTER AND TRIP AMPLIFIER
NAMUR Sensor
The MTL5521 converts a frequency or rotational speed signal from a proximity 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 signal that is proportional to the rotational speed or frequency of the input. A relay output is provided, with two configurable set points, allowing monitoring of the input frequency. When the input frequency is within this window the relay is energised and a yellow LED is illuminated. A start-up delay is triggered by a NO contact allowing the system to start 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 to be displayed and configured: * * * * * * * Output current either 0-20mA or 4-20mA 0/4mA and 20mA frequency values Line fault detection: Off, wire-break and/or short circuit Upper and lower threshold values of the set point relay (including hysteresis) Start uptime delay 0 to 1000s Filter time constant Scaling factors
1 2 3 4 5 6 7 8
9 10 11 12 13
+
Load
V or I
-
Vs+ Vs- **
14 15 16
Start up delay
** see 'Power supply' for options
Terminal 5 6 7 8 9 10 11 12 13 15 16
Function Namur Sensor +ve Namur Sensor -ve Start up delay +ve Start up delay -ve 0/4-20mA output +ve Speed Monitor Speed Monitor Speed Monitor 0/4-20mA output -ve Supply +ve Supply -ve
A line fault detect facility detects open and/or short circuits in the field. When a fault is detected the relay de-energises and the yellow LED changes to red.
SPECIFICATION
Number of channels One, with a configurable alarm Location of delay switch Zone 0, IIC, T6 hazardous area Div. 1, Group A hazardous location Location of proximity detector Zone 0, IIC, T4-6 hazardous area if suitably certified Div. 1, Group A hazardous location Hazardous-area input (Rotation sensor) Frequency input 0 to 10kHz Pulse width 20s Start-up delay 0 to 1000s (adjustable) Input circuits Input conforms to NAMUR/DIN 19234 Voltage applied to sensor 8.2V from 1k Input characteristics Switching threshold 1.55mA Open-circuit threshold <0.1mA Short-circuit threshold >6mA Safe-area output Signal range 0/4 to 20mA Safe-area load resistance 0 to 500 Filter time constant 0 to 60s in 80ms increments Relay type Single-pole changeover relay Relay characteristics Switching voltage <250V ac/120V dc Switching current <2A Switching capacity <500VA/60W LED indicators Green Power Yellow K1 Set point relay status Yellow (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/5W Isolation 250V rms between input, output and power supply terminals, tested at 2.5kV rms between safe and hazardous terminals Terminals Each terminal will accommodate 2x2.5mm2 conductors Mounting On 35mm (top hat) rail Location of units Safe area Ambient temperature limits Operating temperature -20C to +60C Dimensions Height (above rail) 105mm Width 89mm Rail length required 36mm Safety description 13V, 30mA (terminals 5-8) Um = 250V ac
DIMENSIONS (mm)
13 14 15 16 9 36 10 11 12 Display
Pwr K1
S1
S2
89
5 1
6 2
7 3
8 4
110
EUROPE (EMEA) Tel: +44 (0)1582 723633 Fax: +44 (0)1582 422283 AMERICAS Tel: +1 603 926 0090 Fax: +1 603 926 1899 ASIA PACIFIC Tel: +65 487 7887 Fax: +65 487 7997 E-mail: enquiry@mtl-inst.com Web site: www.mtl-inst.com
June 2004

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