2 — INSTALLATION SPECIFICATIONS AND WIRING
Curtis Model 1351 – December 2018
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pg. 28
Power Supply Outputs
The +5 V and +12 V external supplies provide auxiliary power for low-power circuits such as
encoders, potentiometers, RTDs, and similar devices. e I/O Ground (at pin 8) is the return line
for these low power devices. Both power supply outputs are protected against shorts to B+ or B−. e
default state is O. ey are individually enabled (turned On) using either their enable parameter
or VCL.
e +5 V supply is typically used for encoder feedback devices (e.g., quadrature encoder or Sin/Cos
sensor). e current draw on this supply is measured and can be used to detect command sensor
faults, or wiring faults by use of min/max thresholds: see the monitor variable Ext 5V Current.
Use the +12 V supply for devices requiring higher voltage. Its current draw is measured and can be
used to detect sensor faults or wiring faults by use of min/max thresholds: see the monitor variable
Ext 12V Current.
Table 17 Power-Supply Outputs Electrical Specications
Signal Name Pin Output Voltage Output Current
+5 V 10 5 V ± 5 % (regulated)
150 mA (typ.)*
MEASUREMENT RANGE
5 – 315 mA
+ 12 V 9
12 V ± 15 % (load
dependent)
150 mA (typ.)*
MEASUREMENT RANGE
5 – 315 mA
Ground (I/O Gnd) 8 — —
* The combined load current between the +5V and +12V outputs cannot exceed 300 mA
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