Programming 103
After the connections are made, configure the A2 analog input for motor temperature protection by setting H3-09= “E: Motor
Temperature”. Parameters L1-03, L1-04, and L1-05 set the response to the alarm level being exceeded, response to the fault
level being exceeded, and temperature sensing delay time, respectively.
The proper value of the branch resistance is approximated by the formula:
Where: (R
ptc@Tr
x 3) = The resistance value of the thermistor at either the alarm or fault level adjusted for three phase (three
thermistors in series, refer to typical PTC thermistor characteristic in Figure 72).
V
S
= The supply voltage (+15Vdc)
V
ptc@OH3
= The rated voltage for the over-temperature alarm or fault
Function: Fwd Torque Limit
Setting: 10
Function: Rev Torque Limit
Setting: 11
Function: Regen Torque Limit
Setting: 12
Torque limit can be independently set by the analog input programmed for the proper motoring condition (quadrants 1, 2, 3,
and 4) as a percentage of motor rated torque.
Fig. 74 Analog Input Torque Limit - 4 Quadrant Operation
Function: Torque Reference
Setting: 13
Torque reference (in torque control, d5-01 = 1) or torque limit (in speed control, d5-01 = 0) can be set by the analog input as a
percentage of motor rated torque. Torque reference can be set in positive or negative direction.
Rbranch =
(R
ptc@Tr
x3) x (V
S
-V
ptc@OH3
)
V
ptc@OH3
REV Run Regen
12: Regen Torque Limit
Positive Torque Reference
Negative Torque Reference
FWD Motor Rotation
REV Motor Rotation
REV Run Motor
11: Rev Torque Limit
FWD Run Regen
12: Regen Torque Limit
FWD Run Motor
10: Fwd Torque Limit
Quadrant 1
Quadrant 2
Quadrant 3
Quadrant 4
15: Torque Limit
15: Torque Limit
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