DIN RELAY 4
11
Manual Controls
Use the keypad to manually select and switch relays. Hold
a button down for 5 seconds to lock or unlock a relay. Local
keypad control may be disabled in software by the admin.
Contact Ratings and Protection
The internal T-90 Relays have the following ratings:
240VAC
NO 40A
NC 30A
277VAC
NO 30A
NC 20A
30VDC
NO 20A
NC 10A
250VAC
NO 1HP
NC 1/2HP
Relays are RU and CE approved, rated at 1 million
mechanical, 250,000 electrical operations at 50% load and
800,000 operations at 10% load. The relays are sealed.
Because the DIN case terminals are rated at 12A peak we
suggest limiting sustained current to 10A for safety margin.
Only stranded wire of appropriate gauge should be used.
Terminals should be torqued to 20 in-lbs max. It is wise to
recheck torque after completing the installation.
Heavy traces and gold plating are used to minimize internal
resistance between the terminals and relay contacts,
typically 25m Ohms, so contact power dissipation is not
normally a concern.
For maximum flexibility, relay contacts are unprotected. For
high current inductive switching, consider adding an external
snubber circuit to extend contact life. Download contact
protection information from:
Sensor Port
The sensor port is an RJ-12 jack wired for connection to
an optional DHT11 or similar compatible sensor. Pin 2 is
+5V power out, Pin 3 is the bidirectional TTL data bus. All
other pins are grounded. DLI keeps sensors in stock or you
can add your own. Under high humidity conditions, these
sensors should be replaced periodically.
