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PRODUCT INSTALLATION MANUAL
2.7.1.
P
OWER
Connect 24 VDC to the 2-pin removable terminal at the end of the HPTB. The connector is polarized, so
you cannot insert it incorrectly. The polarity is marked on the terminals. A reverse polarity shunt diode and
series fuse protection are provided to avoid damaging the module in case of accidentally reversing the
polarity connection. In this case, the reverse voltage is clamped at –1.2 V and the fuse blows. Restore
correct supply polarity and replace the blown
Improper supply connections can seriously damage the instrument and result in risk of fire
or explosion in hazardous locations!
DC SUPPLY REQUIREMENTS: The MUX is nominally rated for 24 VDC but will function from
approximately 20-30 VDC. The MUX draws a maximum of 30mA from the supply. If the power LEDs fail to
light check that the polarity of the supply line is correct.
Note that a crude, poorly filtered or unregulated supply can produce destructive (hundreds
of volts) voltage spikes during supply transformer switch-off transient. This could cause
minor problems to electro-mechanical components like relays or solenoids but will surely
degrade or destroy electronic equipment.
SUPPLY CONDUCTORS SIZING: Since these HIS boards supply power for the AI channels, a single unit
can normally require up to 2.56A and its conductors should be sized accordingly. Pepperl+Fuchs
recommends 14 AWG or larger wire be used to power this product.
2.7.2.
G
ROUNDING
The HPTB provides an earth terminal lug for connecting the various shield wires to earth. Also included
with the HPTB is a DIN rail mountable terminal block. Use of the terminal lug and terminal block for earth
grounding will provide the shortest path and best practice for grounding of the HPTB. A 10-14 AWG cable
should be secured between the terminal lug and DIN rail block which provides a single point to properly
ground field wiring cable shields. This terminal may not be necessary to use if best practice grounding
techniques are employed.
The HPTB board provides connections of the shield pins T, H, w, and FF for J1 though a customer
selectable jumper to provide direct connection to the earth terminal lug, or to provide this connection
through capacitive coupling. Refer to Table 2.
The HPTB also provides customer selectable capacitive coupling for the shielding. Setting the shield to be
direct coupled or capacitively coupled is accomplished through jumper shunts. Placing the jumper shunt
across the pins will bypass the capacitor and direct couple the corresponding shield to earth. Refer to
Table 2 for a complete list of the shunts and the associated shield. For best practice any shield should be
direct coupled at one end of the circuit.
fuse.
Be certain to reinstall a good, properly sized, new fuse.
WARNING!
WARNING!
Table 2 – Shield Configuration
Jumper Shunt #
JP1
JP2
DOCT-B3K6
HPTB/32/TR-AI-03
Analog Input
RS-485 earth connection
J1 earth connections
P
11
21
AGE
OF
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