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Connecting Optional Form C Dry Contact & Audible Alarm
("D" suffix near end of model number)
Three (3) 3' (~1m) 18 AWG wires are included through the
nipple with this option. (These are smaller than the 10 AWG
SPD conductors.) Gray is Common, Blue is Normally Open and
Red is Normally Closed. Normally Open and Normally Closed
are based on the 'Normal' condition of the unit being energized
and operating correctly. When not energized, or not operating
correctly, the contacts' state will be opposite of 'Normal'. (We
generally recommend the Normally Closed configuration because
it detects disconnected or failed wiring whereas Normally
Open does not.) The contact is rated 250V, 5A. Higher energy
applications require supplemental relaying. This option monitors
suppression element condition and is not intended for use as
phase loss or phase detection monitoring. If the Dry Contacts are
not utilized, insulate lead ends, coil and secure. Audible Alarm
will still function correctly.
Remote Indication Option
This is a supplemental diagnostic LED that can be mounted in a
conspicuous location if the SPD is installed such that on-board
LEDs are not readily visible. A green LED bezel assembly includes
two pre-attached wires and two butt-splice connectors. The
SPD includes two yellow 18 AWG wires, pre-wired through the
SPD's nipple mounting connection. Pre-plan the installation per
normal installation Instructions. Mount the LED assembly in an
appropriate conspicuous location. Connect the LED wires to the
yellow SPD wires with the provided butt-splice connectors. These
are not polarity sensitive. Test by energizing and de-energizing
SPD. Operation is straightforward: green LED On = SPD is OK. If
the LED is out, the SPD has failed, power is not present, or one of
more phases are not energized.
Figure 6: Dry Contact
•
Normally Closed (suggested):
Use Gray and Blue
•
Normally Open:
Use Gray and Red
Power Leads
Normally Closed
Blue
Gray
Common
Red
Normally Opened
4
Dry Contact Leads
Blue
Grey
Normal Operation
Green LED Indicators
Each phase's LED Indicator illuminates when the SPD is energized
and operating correctly. Every suppression element is monitored
and connected by logic to the LED. Should any suppression
element fail, the green LED will extinguish.
Form C Dry Contact and Audible Alarm Option
Similar to the Green LEDs above, the dry contact will change
state and the audible alarm will sound upon suppression element
failure. The audible alarm may be silenced by removing power
to the SPD.
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