Plug-In Modules; Relay Module - Signet 9900 Operating Instructions Manual

Plug-In Modules

Optional modules and accessories are available for the 9900:
a. Base Unit (required)
b. Slot for optional H COMM Module
c. Slot for optional Conductivity/Resistivity, Batch, or 4 to 20 mA Output Module
d. Slot for optional Relay Module (not available on fi eld mount)
Each item is ordered separately.
Modules are fi eld-replaceable at any time.
See Module Installation (pg. 3) and Ordering Information (pg. 72) sections for more details.
9900 Generation
9900 Module
I
H COMM* X
Relay X
Conductivity/
X
Resistivity
Batch
4-20mA
Output*
*Able to run on Loop power

Relay Module

(Panel Mount installations only)
Mfr. Part No. Code
3-9900.393 159 001 698
In addition to the standard programmable Open Collector output in the base unit, the
Panel Mount version of the 9900 has a slot for an optional Relay Module, which adds two
programmable dry-contact relays. The Open Collector output in the base unit uses the Relay
1 setting in the menus. If the optional Relay Module is installed, these are assigned to relays
2 and 3 in the menus.
Dry-contact relays are electromechanical switches with a moving contact armature.
They are suitable for many general-purpose applications, AC or DC, including AC loads up to
250 V. Install RC Filter Kits, 3-8050.396, on relays used to switch motor or inductive loads.
● Two (2) SPDT dry-contact relay (DCR) inputs
● User programmable
● 250 V, 5 A maximum resistive loading (AC).
● Can switch line voltage (typically 120 to 240 VAC)
● Can switch DC voltage (< 30 VDC @ 5A)
● Larger voltage and current ratings than Open Collector outputs.
For wiring information, refer to the Relay and Open Collector Wiring section, page 18.
NOTE:
The Relay Module requires 10.8-35.2 VDC, 300 mA power connection to DC PWR Terminals.
The Relay Module cannot be used with loop power.
● The two red Mechanical Relay Indicator LEDs on the front panel of the 9900 show the
status of relays 2 and 3. (Status of all relays and Open Collector is available at all times
in a single screen in View mode.)
● Hysteresis and time delay are adjustable for each relay.
CAUTION
Switching active loads (usually inductive) can cause contact arcing suffi cient
to damage the relays.
The RC Filter Kit or "snubber" (part number 3-8050.396) is available as an
accessory to reduce or eliminate these damaging effects. Recommended for
inductive loads greater than 50 VAC (remote relays, solenoids, pumps, etc.)
4 9900 Transmitter
II III IV
X X X
X X X
● Minimize handling of the plug-in modules to
reduce the possibility of damage due to ESD.
X X X
● Handle modules by the edges.
Never touch any exposed circuitry or contacts.
X X X
● Wear an anti-static wristband or stand on an
anti-static mat, or keep one hand touching a
X X
properly grounded pipe or other piece of properly
grounded metal when handling modules.
Description
Relay Module - Two dry-contact relays
CAUTION
Avoid Electrostatic
Discharge (ESD).
a.
b.
c.
d.
CAUTION
DO NOT bundle
Relay Module wiring
with other wiring.
Doing so may cause
injury and/or damage
to 9900 Transmitter,
Relay Module, and
Batch Module.