Ventilation Control - Macurco DVP-1200 Manual

Macurco TM DVP-1200 Manual
The top left box will have TROUBLE highlighted.
If the sensor in trouble is assigned to any of the zone, then status of the zone is updated to indicate TROUBLE in the middle box
of the display.
The bottom box will cycle through all sensors that are in trouble, at five seconds per display. It will display sensor address, gas
type, zone number (if assigned to a zone) and corresponding trouble description.
Possible trouble conditions are:
• Any configured channel has less than 4 mA flowing in the current loop
• A sensor is reporting a trouble condition
• Any configured channel wiring is open or shorted.
Internal controller board problems are detected.
•
If an external horn and/or strobe are connected and configured to signal a trouble condition, they will also sound when a
trouble condition occurs, after a delay, if that configuration option is selected.
When the HUSH key is pressed, the internal buzzer will be silenced for eight (8) hours. HUSH key must be held for three (3)
seconds in order to silence the horn and strobe.
When all indicators have been silenced, the display will show that trouble indications have been silenced for eight hours. After
any key is pressed (or five seconds), the display will return to normal mode and hush led will light up steady red.

4.5 Ventilation Control

The ventilation control function operates independently from the alarm function. It provides the ability to configure the DVP-
1200 for control of up to 8 zones. Each zone can be configured to control relays and an external horn and strobe if desired.
When more than one zone is controlling a relay it only takes one zone to activate the relay, but all controlling zones must
release the relay before it will turn off. Each of the relays, horn, and strobe has independent turn-on delays (to ignore short
duration, transient gas signals) and turn off delays (to ensure minimum run times for fans that must run for internal cooling).
A VFD may be enabled and controlled by the DVP-1200 output relays or the DVP-1200 4-20mA output. This allows an operator
to change fixed speeds for a VFD if it's used as a stand-alone control.
Here is an example of an application where VFD is controlling the speed of a fan: An operator can close relay 1, 2, or 3 to set the
fan speed. If relay 1 is closed, the VFD will operate at 50%, If relay 2 is closed, the VFD will operate 75%, If relay 3 is closed, the
VFD will operate at 100%.
Each zone can respond to gas levels indicated by one or more of the sensors, with configurable turn on and turn off
concentrations (rising and falling) for each gas type.
For example, each zone can be configured to monitor a separate set of four sensors and control a single relay.
A single sensor may be assigned to multiple zones if desired. Here is an example of a control scheme which has single sensors
assigned to multiple zones:
1. One zone monitors all sensors and turns one relay on at a relatively low gas concentration.
2. A second zone monitors the same sensors and turns on a second relay if the gas concentration reaches a higher level.
REV – 1.3.1
Figure 4-5 –
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