General Purpose Controller
SZ1143bDescription
The SZ1143b is a microprocessor-based general purpose controller designed for use in a wide variety of applications: general control, remote setpoint control, general input reset ratio control and differential input (e.g. temperature, pressure, humidity, etc.) control.
Application sequences include:
– Humidification
– Dehumidification
– Dew Point Control
– Differential Temperature
– Differential Pressure
– Static Pressure
– Hot or Chilled Water
– Hot or Chilled Water Reset
Inputs:
Two 4 – 20 mA DC analog, and two digital (dry contact)
Outputs:
One 4 – 20 mA DC analog and two digital (SPST dry contact, 24 VAC @1A)
Display:
32-character LCD
Communications:
RS485, half-duplex, TCSbus
Features
- Stand-alone or network operation
- Two 4 – 20 mA analog inputs suitable for a broad variety of transducers
- Two digital inputs for switches, alarms, clocks, etc.
- One 4 – 20 mA modulating output
- Two relay outputs
- One relay output configurable to work with analog input one or two
- Adjustable P+I+D control on modulating output
- Adjustable offsets and differentials on relay outputs
Specs & Docs
Specifications:
General
Accuracy: +/- 0.5%
Programming: EIA RS485 interface
Display: 32-character LCD
Communications: RS485, half duplex
Memory backup: Non-volatile EEPROM, no battery required
Environmental
Operating temperature: 32 to 131°F (0 to 55°C)
Operating humidity: 0 to 100% RH, non-condensing
Storage temperature: 14 to 140°F (-10 to 60°C)
Electrical
Supply voltage: 24 VAC +/- 20%
Inputs: Two 4-20 mA analog and two digital (dry contact)
Outputs: One 4-20 mA DC analog and two digital (SPST dry contact, 24 VAC @ 1 A)
Analog input impedance: 250Ω
Max. load resistance (analog output): 600Ω
Common mode rejection: 100 db @ 60 Hz
Power consumption: 5 VA max.
Specifications subject to change without notice.
