Copyright © SpectraDynamics, Inc. 2010
Description
If your PPS-2RM-B1 includes the battery backup module, this module will allow the
PPS-2RM-B1 instrument to be powered by a 24 VDC power source in case of loss of
the main AC power. The switch from AC to DC supply operation is affected by a
Schottky diode network and charge storage capacitors to ensure glitch free operation.
The +24 VDC power source connector is located on the back panel of the instrument.
The +24 VDC ground is not connected to the instrument case ground internally,
however both ground connections are available at the DC power connector and may be
connected together at this point.
DC Voltage
The +24 VDC may be used as backup power to prevent loss of signal during power
outages. The DC power supply should be able to provide +24 VDC at 2A. For
optimum performance the following specifications should be used for the power supply.
DC Supply +24 VDC, 2 A
Line regulation +/- 0.05% for a 10% line change
Load regulation +/- 0.05% for a 50% load change
Output ripple < 5mV peak-to-peak
DC Fuse 2.0 Ampere 250V slow-blow
Fuse
A 2.0 Ampere 250V slow-blow fuse is used for +24 VDC operation.
Replace fuses with the same type and specifications
Service
Do not attempt to service or adjust the instrument unless another person, capable of
providing first aid or resuscitation, is present. Contact SDI for any questions or repairs.
Operation
To operate the unit on DC power, locate the DC power entry connector on the rear
panel and connect the power cable. When DC power is applied to the unit, the LED
located on the front panel labeled DC POWER should light up. Connection of the
+24 VDC supply is optional.
