BAS-SVX090B-EN
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Figure 7. Symbio 500 Ethernet ports
Power Supply
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could result in death or serious injury.
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Verify that
no power is present with a voltmeter.
WARNING
Proper Ground Connection Required!
Failure to follow instructions below could result in death or serious injury.
After installation, ensure that the 24 Vac transformer is grounded through the controller.
Measure the voltage between chassis ground and any ground terminal on the controller.
Expected result: Vac <4.0 volt.
NOTICE
Equipment Damage!
Sharing 24 Vac power between controllers could result in equipment damage.
A separate transformer is recommended for each Symbio 500 controller. The line input to the
transformer must be equipped with a circuit breaker sized to handle the maximum transformer line
current. If a single transformer is shared by multiple Symbio 500 controllers:
• The transformer must have sufficient capacity.
• Polarity must be maintained for every Symbio 500 controller powered by the transformer.
Important: If the polarity is inadvertently reversed between two controllers powered by the same
transformer, a difference of 24 Vac will occur between the grounds of each controller,
which can result in:
– Partial or full loss of communication on the entire BACnet MS/TP link.
– Improper function of Symbio controller outputs.
– Damage to the transformer or a blown transformer fuse.
Wiring
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