Sensaphone SCADA 3000 Users manual - Manual (Page 263)

25-1
Chapter 25: Relay Output Module
Chapter 25: Relay Output module
INTRODUCTION
The SCADA 3000 Relay Output Module is an optional component for use with the SCADA
3000 system. The output channels are identical to those included on the SCADA 3000 main
unit. The Relay Output Module features eight latching relay outputs that can be used to
switch equipment on and off. The relays are rated at 2 Amps at 125VAC and have integral
contact protection. They may be controlled manually or automatically via a ladder program or
C-program. In addition, a microprocessor watchdog circuit is integrated to maintain system
reliability. LED indicators are provided to show system power and module operation via a
blinking pulse LED.
INSTALLATION
This chapter provides information necessary to install the Relay Output Module. Correctly
installing the unit will ensure proper functioning and maximum service life. Please read the
entire chapter before attempting installation.
OPeRATING eNVIRONmeNT
The Relay Output Module should be mounted and operated in a clean, dry and safe environ-
ment. Do not mount the unit where it will be subject to shock and vibration. Do not mount
the unit where it will be subject to dirt, dust or moisture. Ideally the unit would be mounted
in a steel or a fiberglass NEMA-4 enclosure. Do not mount the unit or the expansion modules
close to motor starters or contactors that switch inductive loads. These devices generate large
electromagnetic fields that can cause the Relay Output Module to malfunction. Where this is
unavoidable, mount the module(s) and main unit in a separate, grounded, steel enclosure. This
will shield them from harmful electrical interference.
The temperature range the Relay Output Module can operate in is 32°F to 158°F (0°C to
70°C). If you require Relay Output Module to operate in a below freezing environment, you
must take safe and practical measures to keep the module’s temperature above 32°F or it will
not operate reliably.
CAUTION: The Relay Output Module is a sensitive electronic device.
Personnel and work area should be grounded before handling this device. Do
not install a SCADA 3000 system near any strong electrostatic, electromagnetic,
magnetic or radioactive fields. Do not expose it to fumes or corrosive vapors.
mOUNTING THe ReLAY OUTPUT mODULe
When you receive the Relay Output Module, carefully remove it from the box. On the top
and bottom of the enclosure are mounting holes to attach the unit to either a panel or wall.
The mounting surface should be sturdy enough to support 2 lbs. The unit should be mounted
using four #10-32 bolts where appropriate, or four #10 tapping screws. (The screw kit for the
Relay Output Module includes 4 #10-32 screws, 4 #10-32 nuts, 4 #10 lockwashers, and 2 #6-32
screws, 2 #6-32 nuts, and 2 #6 lockwashers. The #6 hardware is for the power supply, if neces-
sary.) When mounting the unit to a wall make sure the mounting screws fully engage a solid
member (for example, a stud) of the support structure. Mount the Relay Output Module in an
upright position so that you can easily connect wires to the terminal strips. The dimensions of
the full enclosure are: 6.1" x 6.3" x 1.2". See Figure 1.