3-7
95-8533
18.2
NOTE
The suffix (-P) or (-B) denes the method
for mounting the panel mount models:
(-P) = mounting plate
(-B) = mounting brackets.
Shield Grounding
Two shield ground terminals are provided
inside the junction box of each device, and
also at the System Controller. Connect shield
ends to the terminals provided (not to each
other) inside the junction box.
CAUTION
Insulate the shields to prevent shorting
to the device housing or to any other
conductor. Refer to Appendix E for EMC
Directive requirements.
Junction Box Grounding
All junction boxes must be electrically
connected to earth ground.
Response Time vs. System Size
When designing a system, it is important to
realize that by increasing the number of nodes
(devices) on the communication loop, the
amount of time required for a status change
message from a detection device to reach the
System Controller also increases.
The System Controller requires a specific length
of time to process each bit of information that is
transferred along the communication loop. As
the number of nodes increases, so does the
amount of data being processed as well as the
time required for processing by the Controller.
If the fastest possible communication response
time is an important criteria for a large system,
it is recommended that the number of nodes on
an individual loop be kept as small as possible.
Consider using multiple controllers with fewer
nodes per loop.
Moisture Damage Protection
Moisture can adversely affect the performance
of electronic devices. It is important to take
proper precautions during system installation
to ensure that moisture will not come in contact
with electrical connections or components.
In applications where the network wiring is
installed in conduit, the use of watertight
conduit seals, drains, breathers, or equivalent
is recommended to prevent damage caused
by condensation within the conduit.
Electrostatic Discharge
An electrostatic charge can build up on the
skin and discharge when an object is touched.
ALWAYS use caution when handling devices,
taking care not to touch the terminals or
electronic components.
Table 3-3B – EQP2XX0PS Power Supply and Converter Specications
Characteristic
EQP2120PS(-B)
Power Supply
EQP2410PS(-P)
Converter
Input Frequency 60/50 N/A
Input Voltage 120/220 Vac 24 Vdc
Input Current, Max. 6.6 / 3.6 Iac 15.7 Idc
Output Voltage Range 24.5 … 28.0 Vdc 24.5 … 28.0 Vdc
Supply Rating 20 10
Maximum Alarm Current 20 10
Maximum Standby Current 20 10
Efficiency
91% for 120 Vac
93% for 220 Vac
88%
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