Woodward MicroNet TMR 5009, Installation/Hardware Manual

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Manual 85580V2 5009 Installation/Hardware
Woodward 11
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route each contact input signal to the system’s three independent (rack
mounted) discrete modules
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provide an open / closed contact output based on associated discrete
module commands
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indicate the health of all relays (latent fault detection)
WARNING—HAZARDOUS LOCATIONS
This equipment is not suitable for use in Class I, Division 2 hazardous
locations if an F/T Relay module is installed in the cabinet. It must be used in
ordinary or non-hazardous locations only.
Discrete input power (contact wetting voltage) can be supplied by the 5009
control or from an external source. The 5009 control provides an isolated 24 Vdc
power source for contact wetting. The external source may be 24 Vdc or 125 Vdc
(North American installations only). Separate discrete input terminals are
provided based on the level of contact wetting voltage used. See Figure 4-9.
CAUTION—MAXIMUM VOLTAGE
To comply with CE Marking under the European Low Voltage Directive
(LVD), the maximum external circuit voltage for both the Discrete Inputs and
Relay Output circuit are limited to 18–32 Vdc maximum.
The discrete output relays are mounted on sockets, with 18 relays per DTM. Six
relays, are used to create each relay output (normally open and normally closed
contacts) and allow latent fault detection. See Figure 4-15. This configuration
allows independent testing of each relay output (latent fault detection) without
concern of relay position. Customer power is connected to one side of the
configuration and load to the other.
Discrete outputs can be configured to use latent fault detection to identify output
relay failures without affecting operation. When the contacts are closed, they are
periodically opened in pairs, to ensure that they are in the correct state, and that
they change state. When they are open, they are periodically closed individually,
to ensure that they close. Any failures are annunciated, and further testing is
disabled.