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7
Smart Relay 4 G2 Installation and Operation Manual
INSTALLATION
Input Jumper Configuration
Each input is equipped with an internal four-position header and two jumpers. The
headers are labeled JPx and are numbered IN-1 through IN-8. The factory default
configuration is for a DRY input (relay contact, switch, open collector) with a
jumper over pins 1 & 2 and another jumper over pins 3 & 4. To change the input to
WET (user supplied voltage between 5 and 24 VDC, or 25-48 VDC with an exter-
nal resistor), remove both jumpers and place ONE jumper over pins 2 & 3.
Relay Outputs
The Smart Relay 4 G2’s relays are 2PDT normally open/dry. Make your connections
to the desired relays K1 A/B thru K4 A/B. Front panel LEDs indicate when a relay
is active.
CM = Common Relay Contact (Wiper)
NO = Normally Open Relay Contact
NC = Normally Closed Relay Contact
LED Indicators
• “PWR”: Power LED (Green).
• “K1”- “K4” Relay LEDs: Lit when the corresponding relay is on. (Green)
• “1-8” Input LEDs: Lit when the corresponding input is on. (Yellow)
USB PGM Port
The front-panel USB type-B port is used to connect the Smart Relay 4 G2 to a com-
puter for configuration via a virtual COM port. See the “Programming” section of
this manual for more information on setting modes and timers for each channel.
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