Instruction manual

The Control Unit
1-2
Installation, SPM, Maintenance, and Troubleshooting Supplement
Power Supply 1
CAUTION:
Grounding circuit continuity is vital for safe operation of the MERLIN
MAGIX system. Never operate with the grounding conductor
disconnected. The ground-screw connection is located on the carrier.
The 491D1 (100–240 V AC) power supply modules can provide up to 96 unit
loads of current per carrier; therefore, an auxiliary power unit is not required
with these modules. In addition, three test points are provided for measuring
DC voltage outputs.
Power Specifications 1
Each 491D1 power supply draws a maximum current of 5.4 amperes at 117 V
AC (60 Hz); the 491D1 power supply draws a maximum current of 3.1 amperes
at 220 V AC (50 Hz). Output power is:
+5.1 V DC (10A), –5.1 V DC (1.5A), –48 V DC (3.0A)
Test Points 1
There are three voltage test points, one each for the +5.1 V DC, –5.1 V DC, and
–48 V DC outputs. These test points enable service personnel to measure the
+5.1 (± 5%), –5.1 (± 5%), and –48 V DC (± 10%) outputs delivered to the
MERLIN MAGIX backplane. Use the ground terminal when measuring the
output voltages at these test points.
Outside the North American continent, the power cord plug on the
491D1 power supply module may need to be replaced with an IEC
(International Electrotechnical Commission) approved plug (at
least 10 amps and 250 volts).