Watlow F4T • 317 • Chapter 6 Appendix
1 Temperature Input
• Thermocouple, grounded or ungrounded sensors
- >20MΩ input impedance
• Max. of 2KΩ source resistance
• RTD 2 wire, platinum, 100Ω and 1000Ω @ 32°F (0°C) calibration to DIN curve
(0.00385Ω/Ω/°C)
- Maximum lead resistance 10Ω
1 Digital Input
• Digital input update rate 10Hz
- DC voltage
- Max. input 36V @ 3mA
- Min. high state 3V at 0.25mA
- Max. low state 2V
- Dry contact
- Min. open resistance 10KΩ
- Max. closed resistance 50Ω
- Max. short circuit 13mA
1 Current Transformer Input
• Accepts 0-50mA signal (user programmable range)
• Displayed operating range and resolution can be scaled and are user programmable
• Current input range: 0 to 50mA ac, 100Ω input impedance
• Response time: 1 second max., accuracy ±1mA typical
• Requires optional current transformer, Watlow part number: 16-0246
Switched DC Output
• Switched dc = 22 to 32VÎ (dc) @ 30mA per output, 40mA per pair (option CC)
Open Collector Output
• Switched dc/open collector = 30VÎ (dc) max. @ 100mA max. current sink
Solid-State Relay Output
• Form A, 1A at 50°F (10°C) to 0.5A at 149°F (65°C), 0.5A at 24VÅ (ac) min., 264VÅ
(ac) max., opto-isolated, without contact suppression
Form A Electromechanical Relay Output
• 5A, 24 to 240VÅ (ac) or 30VÎ(dc) max., resistive load, 100,000 cycles at rated load,
requires a min. load of 20mA at 24V, 125VA pilot duty
Form C Electromechanical Relay Output
• 5A, 24 to 240VÅ (ac) or 30VÎ(dc) max., resistive load, 100,000 cycles at rated load,
requires a min. load of 20mA at 24V, 125VA pilot duty
NO-ARC Relay Output
• Form A, 12A at 122°F (50°C), 85 to 264VÅ (ac), no VÎ(dc), resistive load, 2 million
cycles at rated load
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