Sumitomo Cyclo BBB4 - Motor Wiring; Wiring Guidelines; Measuring Insulation Resistance

Cyclo® BBB4
Motor Wiring
Motor Wiring
40 Operation & Maintenance Manual
Cyclo® BBB4
• Donothandletheunitwhencablesarelive.Besuretoturn-othepower;otherwiseelectricshockmayresult.
• Connectthepowercablestotheunitaccordingtotheconnectiondiagramshowninsidetheterminalboxorinthemaintenance
manual; otherwise electric shock or fire may result.
• Correctlygroundthegroundingbolt;otherwiseelectricshockmayresult.
• Keepallwiringandelectricalpartsdryandmoisturefree.
• Followlocalelectricalcodesandregulationswhenwiring;otherwiseburning,electricalshock,injuryand/orremayresult.
• Themotorisnotequippedwithanoverloaddevice.Sumitomostronglyrecommendsthatanotherprotectivedevice
(i.e.: ground fault interrupters, etc.), in addition to an overload device, be installed in order to prevent burning, electric shock, personal
injury and/or fire.
• Forsinglephasemotors,exercisecautionsoastonotdamagethevinylcoverofthestartingcapacitor,otherwiseshockmayresult.
• Forbrakemotors,donotelectrifyabrakecoilcontinuouslywhenthemotorisstoppedotherwisethebrakecoilmayburnand
fire may result.
• Forbrakemotors,installtherectierwherethetemperatureislessthan140°F(60°C)
• Longwirescausethevoltagetodrop.Selectcableswithappropriatediametersothatthevoltagedropwillbelessthan2%.
• Afterwiringthemotor,checkthattheterminalboxmountingboltsaretight.
Measuring Insulation Resistance
When measuring insulation resistance, disconnect the motor from the control panel. Check the motor separately.
Never touch the terminals when measuring insulation resistance otherwise electrical shock may occur.
Measure the insulation resistance before wiring. Insulation resistance varies according to the motor voltage, insulation type, coil
temperature, humidity, length of operation, test electrification time, etc.
Under most conditions, the insulation resistance exceeds the value shown in this table:
Wired connections
must be wrapped in
insulating tape
(notshown)
Power Source Side
Motor Side
Mega-Ohm
Insulation Resistance
500V 1M (Ω)
Table 35. Insulation Resistance
Figure 3. Terminal Ring Wiring Connection
Wiring Guidelines
This section details wiring for standard Sumitomo three-phase motors and brakemotors. If using a motor manufactured by a company other than
Sumitomo, please refer to that manufacturer’s instruction manual for wiring, operating and maintenance details. When wiring motors into the
power supply, Sumitomo recommends the use of terminal rings to facilitate the connection:
A drop in resistance may be attributed to poor insulation. In such
case, do not turn on the power. Contact the nearest Sumitomo
representative, distributor, or sales office.
Figure 4. Three-Phase WYE Connection Motor
Figure 6. Three-Phase Motor, 575V, 60Hz