User Guide

Installation 2-5MN850
UL Required Fuses for Short Circuit Rating
UL requires R/C fuses, special purpose fuses (JFHR2) or semiconductor fuses rated
700VAC be used to obtain the short circuit current ratings required by UL.
Fuse Manufacturer
Fuse
Model Number Bussman (300 KA A.I.C.)
Catalog Number
Ferraz (200 KA A.I.C.)
Catalog Number
Fuse
Current Rating
Amperes
Short Circuit Rating
Amperes
MD9 to MD16 170M3110 6.6 URD 30 D08 A 0063 63 5,000
MD23 to MD30 170M3112 6.6 URD 30 D08 A 0100 100 5,000
MD44 170M3114 6.6 URD 30 D08 A 0160 160 5,000
MD59 170M3115 6.6 URD 30 D08 A 0200 200 5,000
MD72 to MD85 170M3116 6.6 URD 30 D08 A 0250 250 10,000
MD105 to MD146 170M3119 6.6 URD 30 D08 A 0400 400 10,000
MD174 to MD202 170M3121 6.6 URD 30 D08 A 0500 500 10,000
MD242 170M4114 6.6 URD 31 D08 A 0500 500 10,000
MD300 170M4114 6.6 URD 31 D08 A 0500 500 18,000
MD370 170M4116 6.6 URD 31 D08 A 0630 630 18,000
MD500 170M6113 6.6 URD 33 D08 A 0900 900 18,000
MD600 170M6113 6.6 URD 33 D08 A 0900 900 30,000
MD750 170M6116 6.6 URD 33 D08 A 1250 1250 30,000
MD900 170M6116 6.6 URD 33 D08 A 1250 1250 42,000
MD1100 170M6116 1500 42,000
MD1200 (2) 170M6116 (2) 1000 42,000
Main Input Contactor An IEC or NEMA rated contactor is recommended at the input power to the control. The
soft–start control uses three pairs of SCR (silicon controlled rectifier) semiconductor
devices that do not positively disconnect power. Figure 2-1 shows that the input
contactor provides a positive disconnect.
Table 2-2 Connection Descriptions
Terminal Description
L1, L2, L3 Input AC power terminals. Connect input isolated 3 phase supply (any phase to any terminal).
T1, T2, T3
Output Power Terminals. Connect an induction motor to these terminals. For correct motor rotation,
connection of these phases must correspond with the supply connections (L1, L2, L3).
X1, X2
Control Supply Input. The internal circuits require power from a 115VAC or 230VAC source (Table 2-3).
A selector switch is provided to select the voltage range of the source that is connected to this input.
S1, S0
Remote Start/Stop Input. A voltage present across these terminals will initiate a “Start”.
Removing the voltage from across these terminals will initiate a “Stop”.
Note that the factory setting is keypad Start/Stop.
Pins 11 and 12 are the normally closed “Run” relay contacts.
Relay K1
Pins 11 and 14 are the normally open “Run” relay contacts.
Pins 21 and 22 are the normally closed “Top of Ramp” relay contacts.
Relay K2
Pins 21 and 24 are the normally open “Top of Ramp” relay contacts.