Honeywell System 57 5704 Control System

System operation and core functions

1. Basic operating procedures

(1) System startup and initialization

Power off inspection: Before starting, confirm that all control cards and interface cards have been correctly installed, the wiring is not loose, and the power supply voltage meets the requirements of 18-32V DC.

Step by step power on: First, connect the DC input card power supply and check that the green power light on the engineering card is always on (indicating that the power supply is normal); Insert the control cards one by one and observe that the "INHIBIT" light on each card lights up (the suppression period starts for about 30 seconds). After the suppression period ends, the light goes out and the system enters normal monitoring mode.

Sensor signal verification: Use the engineering card "BEAD mA" (catalytic card) or "SIGNAL" (4-20mA card) function to check if the sensor signal is normal (such as catalytic card bridge current of 200mA, 4-20mA card signal within normal range).

(2) Alarm and reset operations

Alarm recognition: Determine the alarm type through the control card LED light——

Red flashing: A1 (1 time/second), A2 (2 times/second), A3 (3 times/second) concentration alarm; STEL/LTEL alarm (1 second on/1 second off, slow flashing).

Yellow flashing: sensor malfunction, circuit malfunction; Yellow constantly on: Channel suppressed (manual/remote suppression).

Reset operation:

Normal reset: Short press the "RESET/SET" button on the control card to clear inactive lock alarms, fault prompts, and peak displays.

Extended reset: Long press the "RESET/SET" button for 5 seconds to clear the maximum/minimum concentration record, STEL/LTEL timer, and reset the delay relay.

2. Engineering calibration and maintenance

(1) Key calibration steps (unlocked with engineering key)

Zero point calibration (ZERO):

Place the sensor in a clean environment without target gas (such as fresh air) and wait for the signal to stabilize (the control card displays the "Stable" icon).

Select the target channel, press the "ZERO" button on the engineering card, and the system will automatically set the current signal to zero. After calibration, the channel suppression needs to be released.

Range Calibration (SPAN):

Introduce a standard gas of known concentration (recommended concentration ≥ 40% of full range) and wait for the sensor signal to stabilize.

Press the "SPAN" button on the engineering card to adjust the numerical display to the standard gas concentration. After confirmation, the system saves the range parameters and updates the calibration date.

First range calibration (1st SPAN): For new catalytic sensors, record the initial sensitivity for subsequent sensor life monitoring (triggering a "life expiration" alarm when the sensitivity drops to 50% of the initial value).

(2) Key points for regular maintenance

Monthly inspection: Clean the surface dust of the module, check the tightness of the wiring terminals, and verify whether the alarm relay operates normally.

Annual calibration: Perform zero and range calibration according to sensor type (catalytic/4-20mA), check the accuracy of the engineering card clock, and print maintenance records (via RS232 printer).

Sensor replacement: It is recommended to replace catalytic sensors every 1-2 years, and 4-20mA sensors should be replaced according to the manufacturer's requirements. After replacement, the "1st SPAN" calibration needs to be performed again.

System configuration and scalability

1. Flexible configuration options

Alarm logic configuration: supports multiple alarm modes——

Independent alarm: Single channel alarm does not affect other channels;

Zoned alarm: Any channel alarm within the designated area triggers the overall alarm of the zone;

Voted alarm: Multiple channels alarm simultaneously (such as 2/3 channel alarm) to trigger the total alarm, avoiding single sensor false alarms;

Update alarm: Even if there are unreset alarms, new alarms can still trigger prompts to avoid omissions.

Output configuration:

Relay output: can be configured as "normal power on" (power off trigger) or "normal power off" (power on trigger), supporting a switching time of 13-48ms;

Analog output: Each channel can choose 0-20mA or 4-20mA isolated output, used to connect PLC, DCS and other systems to transmit real-time concentration data.

2. Expansion and customization capabilities

Hardware expansion: Increase the number of relays by adding relay expansion cards (05704-A-0131); Upgrade the system power from 50W to 200W by stacking AC-DC power modules (05701-A-0440), supporting more channels.

Software and Communication Expansion:

Engineering software: Configure system parameters (such as alarm thresholds and sensor types) on PC through "Engineering Interface Software", and support data log storage;

Communication module: optional Modbus interface module (RS232/RS422/485), realizing digital communication with the upper computer (such as SCADA system), only used for data visualization, prohibited for safety related control;