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BAS-SVX090B-EN
Transformer Recommendations
The Symbio 500 controller can be powered with 24 Vac or 24 Vdc. You must use a 24 Vac power supply
for proper operation of the binary inputs, which require 24 Vac detection, and also to use the spare 24
Vac outputs to power relays and TRIACS.
• AC transformer requirements: UL listed, Class 2 power transformer, 24 Vac ±15%, device max
load 24 VA, BCI application 6 VA. The transformer must be sized to provide adequate power to the
controller (21 VA) and outputs (maximum of 10A per relay output and 0.5A per TRIAC output).
• DC power supply requirements: UL listed, Class 2 power supply, 24 Vdc ±15%, device max load
420 mA, BCI application 90 mA.
• CE-compliant installations: The transformer must be CE marked and SELV compliant per IEC
standards.
Wiring Recommendations
To ensure proper operation of the Symbio 500 controller, install the power supply circuit in accordance
with the following guidelines:
• The controller must receive AC power from a dedicated power circuit; failure to comply may cause
the controller to malfunction.
• A dedicated power circuit disconnect switch must be near the controller, easily accessible by the
operator, and marked as the disconnecting device for the controller.
• DO NOT run AC power wires in the same wire bundle with input/output wires; failure to comply may
cause the controller to malfunction due to electrical noise.
• 18 AWG (0.823 mm2) copper wire is recommended for the circuit between the transformer and the
controller.
Connecting Wires
Disconnect power to the transformer and then ground one of the terminals on the controller to the
enclosure (if the enclosure is adequately grounded) or to an alternate earth ground.
Wiring
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