Watlow ez-zone pm - Page 251

Watlow EZ-ZONE
®
PMI Controller • 247 • Chapter 11 Appendix
Thermistor Input
Input Type
Max Error @
25 Deg C
Accuracy
Range Low
Accuracy Range
High
Units
Thermistor, 5K range ±5 0 5000 Ohms
Thermistor, 10K range ±10 0 10000 Ohms
Thermistor, 20K range ±20 0 20000 Ohms
Thermistor, 40K range ±40 0 40000 Ohms
• 0 to 40kΩ, 0 to 20kΩ, 0 to 10kΩ, 0 to 5kΩ
• 2.252kΩ and 10kΩ base at 25°C
• Linearization curves built in
• Third party Thermistor compatibility requirements
Base R @ 25C
Alpha
Techniques
Beta
THERM
YSI
Thermistor
Curve
2.252K Curve A 2.2K3A 004 A
10K Curve A 10K3A 016 B
10K Curve C 10K4A 006 C
Current Measurement
• Accepts 0 - 50mA signal (user programmable range)
• Displayed operating range and resolution can be scaled and are user programmable
• Requires optional current transformer
2 Digital Input/Output Option - 2 DIO
• 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
• Digital output update rate 10Hz
- SSR drive signal
- Update rate 10 Hz
- Maximum open circuit voltage is 22 to 25Î (dc)
- PNP transistor source
- Typical drive; 21mA @ 4.5V for DO5, and 11mA @ 4.5V for DO6
- Current limit 24mA for Output 5 and 12mA Output 6
- Output 5 capable of driving one 3 - pole DIN-A-MITE
- Output 6 capable of driving one 1 - pole DIN-A-MITE