The AC power cards operate from standard 50/60 Hz line power. The polarity for connecting
AC power (IN
˜
) is unimportant. The unit operates either way. The DC to DC power card is an
isolated supply that operates between 9 and 36 volts DC.
The “Hold” feature is used to freeze the display. When the contacts are shorted, the display will
“Hold” the last reading until short is removed. It is recommended that a mechanical switch or
relay be used to activate the hold circuit; solid state relays may give unexpected results. The
hold circuit cannot be externally powered.
An external fuse is required for safe operation. For AC supply, use a Slow Blow fuse at .25A,
Littlefuse Part No. 313.250 or equal. For DC supply use a Slow Blow fuse at 1.25A, Littlefuse
Part No. 3131.25 or equal. Fuse only one input.
CAUTION: Hazardous voltages may be present. Disconnect power before
making or removing connections.
Des tensions dangereuses peuvent être présentes. Coupez l’alimentation
électrique avant d’effectuer ou de retirer les connexions.
The 4-20mA output card will generate an isolated output between 4mA and
20mA that is related to the input level. This relationship can be set using the
menu. Linearization will also affect the relation. The factory default is when
the input is at its lowest level, the output is 4mA. When the input is at the
maximum rated input, the output is at 20mA.
Figure 4.1
4-20mA
3.6 Power Supply Cards
4. OUTPUT CARDS
Figure 3.11
120 VAC Supply
IN ~
120VAC
50/60 Hz
10VA
Hold
IN
~
Figure 3.12
Universal AC Supply
IN ~
85-250VAC
50/60 Hz
10VA
Hold
IN
~
Figure 3.13
DC to DC Supply
9 - 36 VDC
Hold
+
10W
4-20mA
+
MAX
-
15
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