Specifications

10
2.7 Interfacing Macurco Sensors
3M™ Macurco™ Sensors with current loop outputs may be used with the DVP-120. See 3M.com/detection for information on compatible 3M™ Macurco™ Gas Transducers.
W WARNING
Immediately exit any environment that causes an alarm condition on the sensor. Failure to do so may result in sickness or death.
Power connections to 3M™ Macurco™ Sensors used with the DVP-120 are polarity-insensitive, since a bridge rectifier is connected to the power input terminals. All sensors used with
the DVP-120 panel employ screw clamp terminal blocks for power and signal connections. Polarity of the current loop connections is marked on the printed circuit board of the sensor.
3 OPERATION
3.1 Initial Operating Mode
When power is first applied to the DVP-120, a few simple tests will be performed, and the system will cycle through all status lights, and display the system name and model # (Figure 3-1).
The system will then proceed to normal mode, if the operating parameters have been entered.
Figure 3-1 Model Display
W WARNING
Each time the unit is turned on it performs a self-test, which activates the audible and visual alarms. If the self-test fails, or all the alarms do not activate, do not use. Failure to do so
may adversely affect product performance and result in sickness or death.
If the user has not entered any parameters, the system WILL NOT be monitoring the sensors or controlling the ventilation system. The relays WILL NOT actuate and the horn and strobe
outputs WILL NOT be powered. The power status light will show NORMAL (steady green) and the system will immediately enter the CONFIGURATION mode, see section 3.2 for details to set
the configuration parameters.
If a valid set of configuration parameters have been entered, the panel will wait for all sensors to warm up. During this time, the display will show a count-down, minutes and seconds, until
the end of the warm-up period (Figure 3-2).
Figure 3-2 Warm-Up Display
During the warm-up period, the keypad will be locked. When the warm-up period ends, the LCD will start showing the normal display.
3.1.1 Status Light Display
The POWER, ALARM/WARNING, SILENCE, RELAY 1, RELAY 2 and RELAY 3 status lights indicate the system status and provide the following data:
• POWER
- Green (steady) – Power is good and there are no trouble indications
- Yellow (steady) – Trouble is indicated by a transducer or the panel itself
• ALARM/WARNING
- Off – All indicated gas levels are below the warning level
- Red (steady) – One or more gas levels is at or above the alarm level
- Amber (steady) – One or more gas levels is at or above the warning level
• SILENCE
- Off –There are no silenced alarms or warnings
- Red (flashing) –There are alarms, warnings and/or troubles that have been silenced (gas levels may or may not remain or continue to be at alarm or warning levels)
• RELAY1
- Off – Relay 1 is not on
- Green (steady) – Relay 1 is on
• RELAY2
- Off – Relay 2 is not on
- Green (steady) – Relay 2 is on
• RELAY3
- Off – Relay 3 is not on
- Green (steady) – Relay 3 is on
The overall system status is visible at a distance via the status lights as described above. More detailed system information is displayed on the LCD, which can show the status of each
relay and sensor. A typical status display is shown in Figure 3-4.