Warning
Hazard of Electric Shock: Remove all power from all devices before removing any covers or doors of the system. Disconnect power at the device and at the power source.
Issue
STC300 terminal detail is different to Specification Sheet and Installation Sheet and there are several versions of the same device.
Product Line
Field Devices
Environment
STC300
Cause
STC300 terminal detail is different to Specification Sheet and Installation Sheet and there are several versions of the same device.
Example of incorrectly wired device. Two versions of the STC300 device are shown.
Resolution
On each version of the devices, there is a printed termination legend adjacent to the terminals, follow this.
24Vdc from the power supply is wired to 24V Loop+ on the device.
Signal to controller is wired to Loop- on the device.
On the controller, the RET is wired back to the 24Vdc supply using the GRD or RET terminal, see power supply specific wiring detail.
