Contemporary Control Systems BASremote User Manual (firmware 3.1.x) - Manual (Page 16)

TD040300-0MF
16
4 Installation
The BAS Remote is intended to be mounted in an industrial enclosure or wiring closet
on 35-mm DIN-rail or panel-mounted with screws (not provided). The panel-mounting
tabs are packaged in a plastic bag within the shipping box. To use these tabs, Figure 3
illustrates how the two studs of each tab are press fitted into their respective holes in
opposing corners of the case.
Figure 3 — Attaching Panel-Mounting Tabs
4.1 Power Supply
The power source for the internal supply is applied via the three terminals labelled
Earth, COM, and HI. Earth allows external connection to earth if better EMC
compliance is needed. COM is for the power source return and also serves as the BAS
Remote common ground connection. Primary 24 VAC/VDC (± 10%) power is applied to
HI and COM. HI connects to a diode accomplishes half-wave rectified power
— while
providing reverse input voltage protection.
Internally, the BAS Remote provides the 24 VDC loop supply to power external devices
attached as inputs to the BAS Remote
— you do not need a separate loop supply.
Since the BAS Remote can source current via its analog outputs, an internal source of
24 VDC is provided for powering outputs. Collectively, the sum of input and output
power cannot exceed 150 mA.
Maximum current draw for any I/O channel is 20 mA
— yielding a total draw of 120 mA
for all six channels. Analog output current sources from the same internal supply, so an
external source of 24 VDC is unneeded
— but a return common is. Six +24 VDC pins
are present to serve external transmitters, so they do not need a separate loop supply.
However, the power supply must serve only its own BAS Remote module.
The BAS Remote requires 24 VDC or VAC from a source via a three-pin removable keyed
connector. The proper connections for various power options are shown in Figure 4.
Note that the BAS Remote Master PoE derives its power from the Ethernet cable and
therefore no internal connection exists for the HI pin on the input power connector.
The recommended size for power conductors is 16
–18 AWG (solid or stranded). Ground
is directly connected to zero volts. Input connections are reverse-polarity protected.
NOTE:
This device is intended for use with Class 2 circuits.