Page 4–150
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 4: AC Drive Parameters
Example for P6.39~P6.44 with RTD (PT100):
An RTD (PT100) is installed to the drive. If motor temperature reaches 135°C (275°F) or higher, the
drive will decrease motor frequency to the setting of P6.43 (Level 1 Frequency Protection). Motor
will operate at this frequency until the motor temperature decreases to 135°C (275°F) or lower. If
the motor temperature exceeds 150°C (302°F), the motor will decelerate to stop and output an
‘oH3’ fault. (oH3 warning is immediate for Level 2; there is the delay for oH# warning when temp
reaches Level 1.)
Set up process:
1) Switch AO2 (SW2) to 0/4~20mA on the I/O control terminal block.
(Control terminal details are shown in Chapter 2, Installation and Wiring.)
Wiring:
Co nnect the RTD (+) wire and sense wire to terminal AO2 (for
3-wire RTDs, connect both positive leads to AO2).
Connect the RTD (-) wire to terminal ACM.
Jumper terminals AO2 and AI1 together to form a short-circuit.
PT100
2) Referring to manufacturer’s applicable RTD temperature and resistance comparison table:
a) Level 1: Desired Temperature = 135°C
b) Level 1: Corresponding Resistance = 151.71Ω
c) Level 1: Voltage at 9mA ≈ 1.37VDC [Volts = (Ohms)(Amps)]
d) Level 2: Desired Temperature = 150°C
e) Level 2: Corresponding Resistance = 157.33Ω
f) Level 2: Voltage at 9mA ≈ 1.42VDC
3) Set the following parameters:
a) P4.02=11 (Analog Input 1 Function = RTD PT100)
b) P4.54=13 (Analog output 2. This will be constant current when switch AO2 is set to
0~20mA)
c) P4.61=45% (AO2 output constant level = 20mA x 0.45 = 9mA)
d) P4.57 = 0 (AO2 mA Select = 0~20mA)
e) P6.41=1.37 (RTD Detect Level 1)
f) P6.43=10Hz (PT100 Drop Frequency)
Set P6.44 to the desired delay time (for RTD Level 1 activation)
When the RTD temperature increases to 135°C or higher, the drive will decelerate to the
selected frequency and display an oH3 warning.
4) P6.42=1.42 (RTD Detect Level 2)
5) P6.39=1 (warning and ramp to a stop)
When the RTD temperature increases to 150°C or higher, the drive will ramp to a stop and
displays an ‘oH3’ fault.
If you prefer to not use the drop frequency, set P6.41 to 0.001V less than P6.42. In this
example, P6.41 would be set to 1.419V
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