SECTION 6: T200 FUNCTIONAL OVERVIEW T200 User's Manual
PAGE 6-21
6.5.10 Programmable Speed Functions
The T200 provides a velocity command mode, in which the state of two digital inputs is used to command the motor to
rotate at one of four user-programmed speeds.
The reference speeds are specified in units of RPM and can be positive or negative. Note that the programmable speeds
is influenced by the ROT_DIR input as described in Section 6.4.9 Rotation Direction.
PROG_SPD_
1 Status
PROG_SPD_
0 Status
Speed Reference Used
0 (no current) 0 (no current) Digital Input Reference 0
0 (no current) 1 (current) Digital Input Reference 1
1 (current) 0 (no current) Digital Input Reference 2
1 (current) 1 (current) Digital Input Reference 3
Table 6.2 Digital Input Speed Programming
6.5.11 Thermal Limiting Indication
The Thermal Limit active THRM_LIM is used to indicate if one of the following sources of current limiting has
decreased the overall thermal current limit to the extent that the current allowed is less than that demanded.
§ Power Amplifier Thermal Protection:- The Thermal Limit output is opened (no current flowing) if the demanded
current is greater than that allowed to ensure the power electronics junction temperatures are less than the
manufacturer's recommended maximum (usually 150° C) less a considerable safety margin.
§ Motor Thermal Protection:- The Thermal Limit output is opened (no current flowing) if the demanded current is
greater than that allowed to ensure the temperature of the motor windings is kept to a safe limit (155° C).
§ RMS Current Protection:- The Thermal Limit output is opened (no current flowing) if the demanded current is
greater than that allowed to ensure RMS current over any averaging period is less than continuous current limit of
the T200.
§ Regeneration Resistance Protection:- The current flowing in the external regeneration resistor is monitored. If the
RMS current in the external regeneration resistor within any averaging period exceeds the continuous current rating
of the regeneration resistor, then the Thermal Limiting output will be opened.
Software Latency to Thermal Limiting Active:- The T200 software will change the Thermal Limiting output within 8
milliseconds of a current limiting occuring. Note however that motor thermal protection is calculated approximately
every 45milliseconds.
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