MICROZONE II Direct Digital Controllers
The MICROZONE II (MZII) controllers, part of the NETWORK 8000 Facility Management System family, are fully programmable units designed to enhance building automation and control strategies.
Overview
The MZII offers custom block programming capabilities, allowing for stand-alone operation and providing system operators with flexibility in creating unique control strategies. It is applicable to a wide range of mechanical equipment. Control programs can be downloaded via the Personal System Interface (PSI) and Xtended Personal System Interface (XPSITM). The MZII utilizes state-of-the-art surface mount technology for reduced size and cost, combined with powerful features and modularity for expandability. Application control programs are stored in non-volatile EEPROM memory, allowing for easy modification and creation of new sequences.
Specifications
Hardware
- Enclosure: Conforms to NEMA-1, UL-916 rated.
- Power Supply Input: 20.4 to 30.0 Vac, 50/60 Hz.
- Maximum Power Consumption: 20 VA at 50/60 Hz.
- Transient Compliance Tests: ANSI C62.41 (IEEE 587), Categories A and B.
- Electrostatic Discharge Test: ±15 kV to case, ±5 kV to field wiring terminals.
Ambient Limits
- Operating Temperature: 77 °F (25 °C) nominal for UUKL Smoke Control; -40 to 140 °F (-40 to 60 °C) for PAZX Energy Management.
- Shipping and Storage Temperature: -40 to 140 °F (-40 to 60 °C).
- Humidity: 5 to 95% RH, non-condensing.
Microprocessor & Memory
- Microprocessor: 80C198, 7 MHz clock speed, 16-bit word size.
- Memory: 64 KB of EPROM, 2 KB of EEPROM, 8 KB of RAM.
- Battery Backup - Clock and RAM: Provides 30 days of backup (uses a replaceable lithium battery).
- Battery Backed-up Time Clock Accuracy: ±150 sec./mo at 77 °F (25 °C).
Inputs
- Analog To Digital Conversion Resolution: 10 bit.
- Universal Inputs Quantity: 8.
- Thermistor Input Range: 20 to 140 °F (-6.67 to 60 °C), compatible with Barber-Colman TS-5700-850 series or equivalent.
- Balco Input Range: -40 to 250 °F (-40 to 121 °C), compatible with Barber-Colman TS-8000 series or equivalent.
- Platinum Input Range: -40 to 240 °F (-40 to 116 °C), compatible with Barber-Colman TS-5800 series or equivalent.
- Potentiometers: 1000 to 20,000 ohm resistance.
- Voltage Input: 0 to 5 Vdc.
- Current Input: 4 to 20 mAdc with 250 ohm shunt resistor.
- Contact Input: Dry contact.
- Maximum Pulse Count Rate: 10 per second (50 msec. minimum On or Off time per pulse) to 1 per 4 minutes (1 input per MZII); OR 1 per second (0.5 sec. minimum On or Off time per pulse) to 1 per minute (up to 7 inputs per MZII).
Outputs
- Analog Outputs Quantity: 4.
- Analog Output Type: 0 to 20 mA range programmable source into 500 ohm maximum load, with momentary short circuit protection.
- Digital Outputs Quantity: 8.
- Digital Output Contact Ratings: 30 VA at 24 Vac, pilot duty; 120 VA at 120 Vac, pilot duty.
- Digital Output Contact Type: Form C (SPDT) isolated.
- Status Indication: Light emitting diode.
General
- Input to Output Response Time: 0.5 seconds maximum.
- Voltage Reference: 5.1 Vdc, 20 mA maximum.
Features
- Complete user creation of custom control strategies through block programming structure, adapting the MZII to virtually any HVAC control sequence or mechanical system.
- Models with battery-backed time clock provide true stand-alone direct digital control with optimum start/stop, scheduling functions, and battery-backed random access memory (RAM).
- Input/output auto-trending with adjustable sample rates continually accumulates and time-stamps the last 48 analog values and last 10 digital changes of state.
- Satellite point command capability from global controllers eliminates "waste" of unused points.
- "Fast" half (0.5) second input to output response times make MZII directly applicable to static pressure, fume hood, and laboratory pressurization applications.
Communications
- Ports: RS-485 asynchronous at 19,200 baud (adjustable) to global controller. Modular jack provided for local connection of the Personal System Interface.
- Local Terminal (PSI): PSI can monitor all device parameters and has access to all program blocks and attributes for complete program editing and creation. Provides up/download capability for system maintenance.
- Network Device Access: PSI connected at one device has access to all network-wide devices on an ASD communication bus. Connection of PSI will not disrupt network communications between the MZII controller and other devices on the bus.
- NETWORK 8000: Supports up to 127 MZIIs per Global Control Module. Shared network data includes all physical input/output points plus capability of WINDO and EMS blocks, which are program definable.
Models
| Part Number | Description | Battery Backed-up Time Clock |
|---|---|---|
| MZ2A-101 | Controller card only | No |
| MZ2A-102 | Controller card only | Yes |
Software Specifications
MICROZONE II Block Library
| Type | Description |
|---|---|
| AO | Analog Output |
| DO | Digital Output |
| EMS | GCM™™ Input |
| HOLI | Holiday Schedule |
| LOOP | Complex PID Loops |
| OSS | Optimum Start/Stop |
| RESET | Setpoint Reset |
| RGRP | Receive Global Group Data |
| SCHED | Weekly/Daily Schedule |
| SEQ | Linear/Binary Sequencer |
| UI | Universal Input |
| UTIL | Utility: Counter, Drive, Flow Detect, Limit, Logic, Math, Stop/Start, Process Alarm, Switch, High/Low, Pulse Width Modulation, Thermostat, Status, Timer |
| WINDO | Window Output to GCM |
Terminal Connections and LED Indicators
The MZII features a comprehensive terminal layout for wiring and diagnostics:
- ASD Bus Communications: Terminals for ASD+ and ASD- for communication wiring, along with SHLD for shielding.
- Power & Inputs: A 5.1V Source (20 mA) terminal is provided. Universal Input terminals (IN1 through IN8) accommodate various sensor types, including high-speed inputs (up to 10 per second) and pulse counting inputs.
- Status Indicators: ASD Bus Communication Indication includes RECEIVE (Yellow LED) and TRANSMIT (Green LED). Digital Output Status is indicated by a Red LED.
- Outputs: Analog Outputs (AO1, AO2, AO3, AO4) and Digital Outputs (NC, C, NO terminals for each of the 8 outputs).
- Interface: A Personal System Interface (PSI) Receptacle allows for local connection and configuration.
- Control/Configuration: Includes a Reset Button, a Status LED (Red), and an Address Switch for device identification.
- Power Supply Wiring: Terminals for 24 Vac Power Supply (24H, 24G) and Ground (GND).
Accessories
| Part Number | Description |
|---|---|
| AD-8969-101 | 10 k ohm shunt resistor kit for high-speed count input |
| AD-8969-202 | 250 ohm shunt resistor kit for 4 to 20 mA analog input |
| AD-8969-206 | 11 k ohm shunt resistor kit for 10 k thermistor sensor (non-850 series) |
| AD-8961-220 | Voltage divider (converts 1 to 11 Vdc signal to 0.5 to 5 Vdc signal) |
| AE-690 | Accessory outboard gear panel, 10-7/8 H x 8-1/2 W x 4-1/4 D in. (276 x 216 x 108 mm) for direct nipple connection to MZ2-1E and MZ2-1CE |
| ENCL-MZ800-PAN | Enclosure, panel mount, 10-5/8 H x 8-1/2 W x 4-1/8 D in. (270 x 216 x 105) |
| ENCL-MZ800-WAL | Enclosure, wall mount, 10-7/8 H x 8-1/2 W x 4-1/4 D in. (276 x 216 x 108 mm) |
| LAPT-80800-PSI | Personal System Interface software (see F-24317) |
| LAPT-80800-EPS-I | Xtended Personal System Interface software (see F-24317) |
MZII Control Schematic Description
The schematic illustrates a typical Fan Tracking VAV (Variable Air Volume) Air Handling System controlled by the MZII. The system manages airflow and temperature to maintain desired conditions.
- Airflow Path: Outside Air and Return Air are mixed, controlled by an Economizer Damper Actuator. This mixed air passes through a Filter. A Mixed Air Temperature sensor monitors this stream.
- Supply Air Control: The filtered mixed air is supplied by a Supply Fan, controlled by a Fan On/Off switch. A Coil is present for temperature regulation. The Discharge Air Temperature is monitored.
- Airflow Measurement: A Differential Pressure (DP) sensor across an Air Flow Station measures airflow.
- Pressure Control: A static pressure sensor is located in the supply duct, approximately two-thirds of the way down, to monitor duct pressure.
- MZII Inputs: The MZII receives inputs from an Enthalpy Input Device, Mixed Air Temp sensor, Fan On/Off status, DP Across Air Flow Station, Discharge Air Temp sensor, and the static pressure sensor.
- MZII Outputs: The MZII controls the Economizer Damper Actuator, a Vortex Damper Actuator, the Supply Fan (On/Off), and the Coil.
- Additional Features: A Smoke Detect sensor is integrated, and an Occupancy Output is available, potentially for lighting enable.
- Wiring: All field wiring is specified to use twisted, shielded pairs for optimal signal integrity.
