User Guide

6-2 Specifications and Product Data MN850
Input Ratings
Input Voltage Range
MD7–XXX = 208/230/460 VAC +10% to –15%
MD8–XXX = 230/460/575 VAC +10% to –15%
Phase Three Phase
Input Frequency 60/50 HZ ± 5%
Overload Rating Continuous 115% of FLA; 350% for 30 seconds.
Duty Cycle Continuous
Peak Inverse Voltage MD7–XXX = 1400VAC maximum
MD8–XXX = 1600VAC maximum
S0, S1 12VDC or 24VDC
X1, X2 115VAC (98 – 126VAC) or 230VAC (196 – 253VAC)
Storage Conditions
Ambient Temperature: –4 to 140°F (-20 to 60 °C)
Humidity: 0 - 95% RH Non-Condensing
Operating Conditions
Enclosure: NEMA 1 – Wall mounted (Industrial indoor, general purpose)
For other enclosures, contact Baldor.
The SCR’s generate about 3.3 watts of heat per running amp (motor
FLA). If the control is mounted in an enclosure, the installer must
provide fans or blower with sufficient ventilation. Fan or blower
should be rated for at least 0.8 CFM per ampere of motor FLA rating.
Baldor provided enclosures are designed to dissipate the heat from
the SCR’s.
Humidity: 0 - 85% RH Non-Condensing (not to exceed 50% at 40°C ambient).
Control Heat Loss 3.3 Watt per running ampere of input current
Ambient Operating Temperature: 32-113°F (0 to +40 °C) enclosed
32-122°F (0 to +40 °C) open panel
Altitude: Sea level to 3300 Feet (1000 Meters)
Derate 1% per 330 Feet (100 Meters) above 3300 Feet
Derating Derate Amp rating 1% per 330 Feet (100 Meters) above 3300 Feet
Derate Amp rating 2% per °C over 40 °C to 60 °C Max
Output Relays – K1 and K2 contacts Category AC1, 230VAC, 3A.