Moog Animatics SmartMotor™ Developer's Guide,Rev. L
Page 301 of 909
Bh
Bit, Overheat
APPLICATION: System
DESCRIPTION: Hardware motor overheat state
EXECUTION: Historical, latched by PID sample
CONDITIONAL TO: Motor temperature, temperature setpoint (TH)
LIMITATIONS: None
READ/REPORT: RBh
RB(0,5)
WRITE: Read only
LANGUAGE ACCESS: Formulas and conditional testing
UNITS: Binary bit
RANGE OF VALUES: 0 or 1
TYPICAL VALUES: 0
DEFAULT VALUE: 0
FIRMWARE VERSION: 5.x and later
COMBITRONIC: N/A
DETAILED DESCRIPTION:
The SmartMotor has an internal temperature sensor on the control circuit board. This provides
a simple safety mechanism to shut down the motor when the average temperature exceeds
85 degrees Celsius.
Under continuous heavy loads, all motors will generate heat. If the heat sink or ventilation
method is inadequate, eventually the motor will overheat. If this situation repeatedly occurs,
it may mean that the motor does not have enough power for the assigned task (inadequate
motor size) or excessive resistance (friction) to motion is occurring. Therefore, check the
design of your motion system. For details on motor sizing, see the Moog Animatics Product
Catalog.
The overheat temperature limit is specified using the TH command, but it cannot exceed 85
degrees Celsius. If the temperature exceeds the TH value, the motor will turn off, and Bh will
be set to 1. The SmartMotor will reject any motion command until the temperature has
dropped below the trip point by 5 degrees Celsius (below 80 degrees Celsius).
Part 2: Commands: Bh
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