Chapter 2 Installing the Encoder
Connecting the Power
© 2015 Harmonic Inc. All rights reserved.
17
Electra 9200, Rev O
shows the DC power supply for the Electra 9200D.
Figure 2–6: DC Power Supply for Electra 9200D
Getting Started
Before you begin wiring the –48 VDC power supply, make sure you provide the necessary
overcurrent protection, wires, and power connector.
Power Source Specifications
The DC power source feeding the encoder must meet the following requirements:
n
Electrically isolated from any AC power source.
n
Positive ground. The Positive bus of the DC power source must be reliably connected to
the Ground bus.
Each feed-pair must provide a continuous supply of power that meets the specifications
shown in
.
Overcurrent Protection
To provide overcurrent protection:
n
Provide overcurrent protection devices as part of each rack housing encoders.
n
Locate a readily accessible disconnect device between the DC power source and the
encoder.
n
Use a 20-amp double-pole fast trip, DC-rated disconnect device for each DC power
connector.
NOTE:
Overcurrent protection devices must meet applicable national and local electrical safety codes
and be approved for the intended application.
Wiring Requirements
The encoder is connected to the DC power source using three wires:
n
–Vin
n
GND
Table 2–1: DC Power Source Requirements
Parameter
Specification
Voltage
40 to 60 VDC
Max operating current
15 amps
Max input surge current
n
20 amps--Electra-9200
n
30 amps--Electra-9200D
40V - 60V
15A Max.
PSU 2
PSU 1
+Vin
GND
-Vin
-Vin
GND
+Vin
(RN-25)
