MID-7654/7652 Servo Power Motor Drive User Guide
4
ni.com
Caution
Connections that exceed any of the maximum signal ratings on the MID-7654/7652 device
can create a shock or fire hazard or can damage any or all of the motion controllers connected to the
MID-7654/7652 chassis, the host computer, and the MID-7654/7652 device. This includes power
signals to ground and vice versa. National Instruments is
not
liable for any damages or injuries
resulting from incorrect signal connections.
Caution
The servo motor connectors on this drive are energized when the unit is powered on. The
rear guard must be in place at all times while the unit is connected to a power outlet. Disconnect the
MID-7654/7652 unit from power outlet before connecting wires to or disconnecting wires from
the servo motor connectors. Strip back the insulation of the servo motor wires to the servo motor
connectors no more than 7 mm. Reattach the rear guard before you reconnect the unit to a power
outlet.
Failure to do so could result in electric shock leading to serious bodily injury or death
. Refer
section of this document for more information.
Hot Surface
The bottom surface of the MID-7654/7652 can get very hot to the touch under certain
conditions. To avoid a burn hazard, refer to the
Setting Continuous and Peak Current Limits
section
Front Panel DIP Switch Settings
section of this guide for the appropriate current setting
and safety hazards.
Operate the hardware only at or below Pollution Degree 2. Pollution is foreign matter in a solid, liquid,
or gaseous state that can reduce dielectric strength or surface resistivity. The following is a description
of pollution degrees:
•
Pollution Degree 1 means no pollution or only dry, nonconductive pollution occurs. The pollution
has no influence. Typical level for sealed components or coated PCBs.
•
Pollution Degree 2 means that only nonconductive pollution occurs in most cases. Occasionally,
however, a temporary conductivity caused by condensation must be expected. Typical level for
most products.
•
Pollution Degree 3 means that conductive pollution occurs, or dry, nonconductive pollution occurs
that becomes conductive due to condensation.
Note
The MID-7654/7652 is intended for indoor use only.
Operate the hardware at or below the measurement category
1
marked on the hardware label.
Measurement circuits are subjected to working voltages
2
and transient stresses (overvoltage) from the
circuit to which they are connected during measurement or test. Measurement categories establish
standard impulse withstand voltage levels that commonly occur in electrical distribution systems.
The following is a description of measurement categories:
•
Measurement Category I is for measurements performed on circuits not directly connected to the
electrical distribution system referred to as MAINS
3
voltage. This category is for measurements of
voltages from specially protected secondary circuits. Such voltage measurements include signal
levels, special hardware, limited-energy parts of hardware, circuits powered by regulated
low-voltage sources, and electronics.
•
Measurement Category II is for measurements performed on circuits directly connected to the
electrical distribution system (MAINS
3
). This category refers to local-level electrical distribution,
such as that provided by a standard wall outlet (for example, 115 AC voltage for U.S. or 230 AC
1
Measurement categories, also referred to as overvoltage or installation categories, are defined in electrical safety standard
IEC 61010-1 and IEC 60664-1.
2
Working voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.
3
MAINS is defined as a hazardous live electrical supply system that powers hardware. Suitably rated measuring circuits may
be connected to the MAINS for measuring purposes.