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ROC800-Series Instruction Manual
3-6
Power Connections
Revised Jul-14
Low Voltage
Cutoff
The design of the PM-30 power module (like the PM-24 power
module it replaces) does not include the low voltage cutoff feature
present in the PM-12 power module. In the PM-12 module, when
power falls below the set LoLo alarm (a default of 10.1V), the module
ceases to provide power to the backplane. Thus, the module shuts
down CPU operations.
Remote Automation Solutions continues to offer the PM-12 for
installations requiring low voltage cutoff. Neither the PM-24 or the PM-
30 has the low voltage cutoff feature. However, if you need low voltage
cutoff, we suggest one of the following solutions:
Place a low voltage disconnect device between the ROC800 and
power source.
Placing a commercially available low voltage
disconnect device between the power source and the ROC800
provides the low voltage cutoff protection. Many low voltage
disconnect devices have user-selectable disconnect values for a
variety of voltages.
VOLTAGE
DISCONNECT
LOW
POWER
SUPPLY
Figure 3-4. Low voltage disconnect device between the ROC800 and
power source
Place a low voltage disconnect device between the solar
regulatory circuitry and the ROC800.
Placing a low voltage
disconnect device between the solar regulatory circuit and the
ROC800 provides the low voltage cutoff protection. Many low
voltage disconnect devices have user-selectable disconnect values
for a variety of voltages.