Honeywell Minitrend QX, User Manual

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43-TV-25-30 Iss.6 GLO Aug 07 UK 257
Latched or Single Pulse
The relay outputs can be set by the user to be either Latched or Single Pulse.
Latched
A latched relay will maintain in its active state until the trigger source has returned to a non
alarmed state, or a second Event has been activated to disable the relay.
Single Pulse
The relay will go active for a period of time, specified by the user, then return to a non active
state. The time out period remains independent of the length of time the active state re-
mains.
Single Pulse Relay Settings
User can specify Pulse length in seconds from 0.1 (100ms) to 6480 (108 minutes) in 0.1 sec-
ond increments.
Fail Safe
Each relay channel can be independently selected with the fail safe option. This will invert
the state of the relay output. With Failsafe Off normally open (NO) relays have open contacts
when the power is off, and open contacts when there is no active alarm. The contacts will
close when an associated alarm goes active. With Failsafe On, normally open relays have
closed contacts when the recorder is powered on and there are no open active alarms, and
the contacts open with an alarm active or when the power is removed.
See “Failsafe Relay
Positions” on page 258.
Relay Output Specification
The Minitrend QX recorder will provide the ability to have at least 1 relay output for each
analogue input (i.e. 16). Multitrend SX recorder will also provide at least one relay output
for each analogue input (i.e. 48), there are three available slots for Digital inputs/ Relay Out-
puts. Up to 8 relay outputs are available for the
eZtrend QXe recorder.
Common Alarm Output
(Not available for the eZtrend QXe recorder)
The common alarm output include a single alarm relay. This relay is the same rating as
those on the 8 & 16 Digital I/O cards. This relay is NC (normally closed) and can be activated
by any alarm. This relay will close when power is removed. This relay is identified as “Fixed”
in the relay output pick lists.
• Rating - 24Vdc 1A Resistive Load
Digital Input Cards
Three options for digital inputs are available
8 Digital Inputs
8 Digital I/O card, this 8-channel card allows the user to configure each channel to be either
relay output or digital input. Relay output rated at 24V DC 1 Amp rated (resistive load).