User manual

Digital Monitor AMC-1DBx Series User Manual

• SILENCE, RESET_RELAY, TEST or Data Base initialization pushbutton pressed.

Note: Audio beeps for SlLENCE, RESET_RELAY, TEST or Data Base initialization

pushbutton action are not disabled by this switch.

2. Delay Disable: When in the OFF position this switch will override and programmable

delays associated with sensor activation. Sensor activation delays can be configured from 0-

3600 seconds for Alarm1-3 and Fail sensor thresholds.

3. Zero Buffering Disable: When in the OFF position this switch will override the

programmable Zero Buffering value. Zero Buffering is used to inhibit display of gas

concentration below a specific threshold. When below this value the sensor will display 0

gas concentration. It can be configured from 0-5% of full scale gas concentration and

applies to the all sensors. Note: An analog output will still assert its assigned zone sensor(s)

gas concentration regardless of the zero buffer setting.

4. Minimum Run Timer Disable: When in the OFF position this switch will override any

relays currently executing their minimum run timer requirements, thus releasing them from

their energised or de-energised state. Minimum run timers can be configured for each relay

from 0 to 60minutes and will hold an active relay for the duration once a sensor/zone sensor

alarm has occurred. Note: Scheduled zone events don’t utilise Minimum Run Timers.

5. Calibration Mode: When in the OFF position this switch will ensure all sensor/zone sensor

alarms will be de-activated and ignored. This will include any current relay activations held

active by their associated minimum and post run timers. Fail devices status will still be

displayed, but external audio buzzer and annunciator will be de-activated. Calibration mode

should be used when making configuration changes through logged in menu navigation,

AMC Manager downloading or MODBUS writes to prevent unnecessary transitions on

building’s fan controller driven by relays. Note: An analog output will still assert its assigned

zone sensor(s) gas concentration regardless of calibration mode.

6. Post Run Timer Disable: When in the OFF position this switch will override any relays

currently executing their post run timer requirements, thus releasing them from their

energised or de-energised state. Post run timers can be configured for each relay from 0 to

60minutes and will hold an active relay for the duration once a sensor/zone sensor alarm

has cleared. Note: Scheduled zone events don’t utilise Post Run Timers.

4.1.2.2 RS-485

Five RS-485 interfaces are provided on terminal blocks, one for each of four MODBUS

interfaces to transmitters and a single RS-485 interface to a Building Automation System. To

facilitate field replacement, the RS-485 driver IC is mounted in a socket.

CAUTION

Power down the Digital Monitor before replacing any RS-485 driver ICs.

Ensure proper ESD precautions are taken before handling ICs.