Curtis 1234/36/38 Manual, Rev. D
1 1 J U LY 2 0 0 8 D R A F T
APPENDIX D
SPECIFICATIONS
APPENDIX D: SPECIFICATIONS
D-1
NOMINAL CURRENT 2 MIN 1 HOUR
MODEL BATTERY VOLTAGE LIMIT RATING RATING
NUMBER (volts) (amps) (amps) (amps)
1234-227X 24 200 200 TBD
-237X 24 350 300 170
-527X 36–48 275 250 120
1236-44XX 24–36 400 400 155
-45XX
24–36 500 500 180
-53XX 36–48 350 350 140
-63XX 48–80 300 300 100
1238-46XX 24–36 650 650 265
-54XX 36–48 450 450 210
-56XX 36–48 650 650 210
-65XX 48–80 550 550 155
Notes: All current ratings are rms values per motor phase. Internal algorithms automatically reduce maximum current limit when
heatsink temperature is >85°C or battery voltage is outside the allowed limits. Heatsink temperature is measured internally
near the power MOSFETs.
2-minute ratings are based on an initial controller heatsink temperature of 25°C and a maximum heatsink temperature
of 85°C. No addtitional external heatsink is used for the 2-minute rating test.
1-hour ratings are based on an ambient temperature of 25°C with the controller mounted to a heatsink with a thermal
resistance of 0.35°C/W for the 1236, or 0.25°C/W for the 1238, operating at a maximum baseplate temperature of 85°C.
These thermal resistances are approximately equivalent to a 0.5m × 0.5m × 8mm thick vertical steel plate in free air with
6kph airflow on one side.
Table D-1 SPECIFICATIONS: 1234/36/38 CONTROLLERS
Nominal input voltage 24V, 24 –36 V, 36–48 V, 48–80 V
PWM operating frequency 10 kHz
Maximum encoder frequency 15 kHz
Maximum controller output frequency 300 Hz
Electrical isolation to heatsink 500 V ac (minimum)
Storage ambient temperature range -40°C to 95°C (-40°F to 203°F)
Operating ambient temp. range -40°C to 50°C (-40°F to 122°F)
Internal heatsink operating temp. range -40°C to 95°C (-40°F to 203°F)
Heatsink overtemperature cutoff linear cutback starts at 85°C (185°F); complete cutoff at 95°C (203°F)
Heatsink undertemperature cutoff complete cutoff at -40°C (-40°F)
Package environmental rating IP65
Weight
1234: 2.84 kg (6.3 lbs); 1236: 4.12 kg (9.1 lbs); 1238: 6.82 kg (15.0 lbs)
Dimensions (W
× L×H) 1234: 155 × 212 × 75 mm (6.1" × 8.3" × 3.0")
1236: 165 × 232 × 85 mm (6.5" × 9.1" × 3.4")
1238: 275 × 232 × 85 mm (10.8" × 9.1" × 3.4")
EMC Designed to the requirements of EN12895
Safety Designed to the requirements of EN1175
UL UL recognized component per UL583
Note: Regulatory compliance of the complete vehicle system
with the controller installed is the responsibility of the OEM.
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