Connecting the control and backup supply (24 v) – ElmoMC SimplIQ Digital Servo Drives-Solo Trombone Installation Guide User Manual
Page 26
Solo Trombone Installation Guide
Installation
MAN-SOLTROIG (Ver. 1.203)
26
3.3.4.
Connecting the Control and Backup Supply (24 V)
In a non-S type Solo Trombone drive (a drive without the suffix S in its part number), a “smart”
control-supply algorithm enables the Solo Trombone to operate with the main power supply
only, with no need for an auxiliary supply voltage for supplying the drive's logic section.
Note that in such model there is no backup ability at all.
If backup functionality is required to store control parameters in the event of main power
outages, then the S type Solo Trombone should be used, with an external 24 VDC isolated
power supply connected to it.
Note that the S type Solo Trombone always requires an external 24 VDC power supply,
regardless if backup functionality in required or not.
Connect the auxiliary 24 VDC power supply as described below.
Note for 24 VDC backup supply connections:
1.
Use a 24 AWG twisted pair shielded cable. The shield should have copper braid.
2.
The source of the 24 VDC backup supply must be isolated, by using an isolation
transformer.
3.
For safety and EMI reasons, connect the return of the 24 VDC backup supply to the closest
ground (PE).
4.
Connect the cable shield to the closest ground (PE) near the power source.
5.
Before applying power, first verify the correct polarity of the connection.
Figure 7: Auxiliary 24 VDC Backup Supply Connection Diagram