Q4 CONTROLLER II Operation and Maintenance Manual
Q4 Controller II Operation Manual
- 2 -
Dec 02, 2021
85350-101-000 Rev A
1. Glossary
Actuate/De-Actuate:
These terms are used instead of ‘make’ and ‘break’ to allow us to
distinguish between performing an action due to an environmental condition and whether the
contact may be closed (‘made’) or open (‘break’) because of our use of double throw contacts, and
the option of normally energized relays.
Averaging:
When setting alarms, the alarm can be set to operate on the basis of the average signal
assigned to that relay. It must be the same gas range.
Baud rate:
A measure of the speed at which data is transferred over a digital communication link.
Given as bit per second (bps). Generally the lower the speed, the more reliable.
bps
: See Baud rate
Characteristic Impedance:
The effects of capacitance and inductance of a pair of wires
expressed as an equivalent resistance.
Configuration Database:
System configuration requires entering a great deal of information
concerning relay operation, sensor type and so on.
Dry Contacts:
The relay contacts are supplied without power applied to any output terminal.
Normally Energized:
The relay coil is energized in the non-alarm state. This is sometimes
referred to as ‘fail-safe’ because in the case of controller failure or loss of power, the relay
contacts will open.
Normally Open Contacts:
In the non-alarm state, but under power, the contacts are open.
Latching:
A relay once actuated remains actuated even though the condition has been removed.
Requires a manual operation to reset.
RS-485 (properly EIA-485):
A wiring and electrical standard for digital communication in a
multi drop environment. It is a 2-wire system, with a differential signal allowing relative immunity
to variations in grounds between devices. RS-485: maximum 32 transceivers per loop, 4000 ft
(1300 meters) max. 120 ohm line termination required. (Line termination resistors are available on
all M-Series devices via selectable jumpers).
Stub:
A short wiring link branching from the main line.
Voting:
When more than one sensor and setpoint is assigned to a relay, then voting defines how
many must reach the setpoint before the relay actuates.
