Connecting The Optional Back-Up Supply Cable (24V) - Elmo Cello Installation Manual

Cello Installation Guide
MAN-CELIG (Ver. 1.5)

3.4.3 Connecting the Optional Back-up Supply Cable (24v)

Power to the Cello is provided by a 10 to 195 VDC source. A "smart" control-supply
algorithm enables the Cello to operate with the power supply only, with no need for an
auxiliary 24 volt supply. If backup functionality is required for storing control parameters in
case of power-outs, an external 24 VDC power supply can be connected, providing
maximum flexibility and optional backup functionality when needed.
To connect the back-up supply to the 24v port on the bottom of the Cello, use the 2-pin
power plug provided with the Cello. Remember, you are working with DC power; be sure to
exercise caution. The required voltage is 24 VDC.
Notes for 24 VDC back-up supply connections:
Use a 24 AWG twisted pair shielded cable. The shield should have copper
braid.
The source of the 24 VDC must be isolated.
For safety reasons, connect the return of
ground.
Connect the cable shield to the closest ground near the 24 VDC source.
Before applying power, first verify the polarity of the connection.
Pin Signal
[+] +24VDC
[-] RET24VDC
"Smart" Control
Supply Options
Function
+24 VDC back-up supply
Return (common) of the 24 VDC
back-up supply
Table 3-5: Back-up Cable Plug
Figure 3-5: Back-up Supply (24v) Connection Diagram
Internal DC-to-DC converters allow for operation from DC power (no
need for auxiliary external 24 VDC supply for normal operation).
24 VDC supply for backing up the control parameters if DC power is
shut off.
24 VDC source to the closest
the
Installation
3-10
Pin Position