National Instruments FP-PWM-520 - Manual (Page 9)

© National Instruments Corp. 9 FP-PWM-520 and cFP-PWM-520
Upgrading Your FieldPoint Firmware
You may need to upgrade your FieldPoint firmware when you add
new I/O modules to your FieldPoint system. For information on
determining which firmware you need and how to upgrade your
firmware, go to
ni.com/info and enter fpmatrix .
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect the [c]FP-PWM-520 to any circuits
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-PWM-520 and its
compliance with international safety standards. The field wiring
connections are isolated from the backplane and the inter-module
communication bus. The isolation barriers in the module provide
250 V
rms
Measurement Category II continuous isolation, verified
by 2,300 V
rms
, 5 s dielectric withstand test. The [c]FP-PWM-520
provides double insulation (compliant with IEC 61010-1) for
working voltages of 250 V
rms
1 . Safety standards (such as those
published by UL and IEC) require the use of double insulation
between hazardous voltages and any human-accessible parts or
circuits.
Never try to use any isolation product between human-accessible
parts (such as DIN rails or monitoring stations) and circuits that
can be at hazardous potentials under normal conditions, unless the
product is specifically designed for such an application, as is the
[c]FP-PWM-520.
Even though the [c]FP-PWM-520 is designed to handle
applications with hazardous potentials, follow these guidelines to
ensure a safe total system:
• There is no isolation between channels on the
[c]FP-PWM-520. If a hazardous voltage is present on any
channel, all channels are considered hazardous. Make sure that
all other devices and circuits connected to the module are
properly insulated from human contact.
1 Working voltage is defined as the signal voltage plus the common-mode voltage.
Common-mode voltage is the voltage of the module with respect to ground.