APPENDIX D
Curtis 1239E-1269E Manual, os 37.0 RevA – May 2021
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pg. 156
Maximum current (A rms) 550 650 500 650
S2–60 minute current (A rms) 155 190 135 200
Continuous current for design life (A rms) 175 175 170 175
Notes: All current ratings are rms values per motor phase.
S2–60 minute current is the typical current achievable before thermal cutback occurs, with an ambient temperature of 25°C and the controller
mounted to a 6 mm thick vertical steel plate with 6 km/h (1.7 m/s) airflow perpendicular to the plate.
Continuous current for design life is the maximum long-term current, at an internal heatsink long-term temperature of 70°C (158°F), at which the
controller will achieve its design life. These numbers are often calculated for a given application by determining an rms duty cycle current and heatsink
temperature. For applications that exceed this, please contact the Curtis distributor or support engineer.
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