Contemporary Control Systems BAScontrol20 Installation Guide - Manual (Page 10)

TD100700-0IA
10
Analog Outputs AO1–AO4
Voltage in the range of 0–10 VDC (with up to 4 mA of current) can be
outputted. No configuration is necessary except to input the BACnet
properties. Configure the BACnet properties using a web page. The
output voltage is applied to point A with respect to common.
Figure 8 illustrates connections
to a three-wire damper
actuator. The damper requires
a 0–10 V command signal
which can easily be
accomplished by the BASC20.
Binary Outputs BO1–BO4
The BASC20 can provide four relay (BASC-20R) or four triac outputs
(BASC-20T). Only configuration of BACnet properties is required. The
maximum voltage for relay units is 30 VAC/VDC and the maximum
current through the relay contacts circuit is 2A. For triac models, the
maximum voltage is 30 VAC and the maximum current is 0.5 A.
Violating these limits could damage the
BASC20 and void the warranty.
Relay outputs can be used as contact
closures for other low-voltage AC or DC
devices, but triac outputs can only be used
for low-voltage AC devices. It is common
for the BASC20 binary outputs to enable
the coil of interposing relays which can
carry larger currents and support
switching higher voltages.
Figure 9 illustrates typical connections for binary outputs. Notice that an
external power supply is necessary to power loads.
Figure 8 — Analog Output Connections
Figure 9 — Binary Output
Connections