The correct procedure for starting a copeland Part Wind Start Compressors.

Important Notes:

Please read before Starting this compressor Copeland Part Wind Start Compressors BWM 60 : 40 AWM 67 : 33 Copeland Partwind Start compressors use varying ratios of motor partwind to allow improved starting torque without compromising reduced in-rush current. However it is important that the motor is correctly connected to ensure …

1. Correct phase polarity to each partwind as each part of the motor must rotate in the same direction and in phase synchronisation

2. That the larger part of the motor starts first. Phase Synchronisation The incoming power phases must split to feed the following terminal pairs … Red Yellow Blue 1 O 2 O 3 O 7 O 8 O 9 O If in doubt trace the leads back to the split point from each terminal connector to verify correct connection. Contactor Operating Sequence Terminals 1 - 2 - 3 are the larger partwind and thus have a lower resistance. This part wind must start first. Check the leading contactor is definitely connected to this set of terminals. The 2nd contactor should lag the 1st by 0.5 - 0.75 seconds. Contactor & Fuse Condition Have you checked your contactors and fuses ? ‘Volts only’ checks of contactors & fuses are very unreliable without normal running current passing through ALWAYS VISUALLY INSPECT THE CONTACT FACES If only 1 or 2 supply fuses have failed then the 3rd will be damaged ALWAYS RENEW FUSES AS A SET OF 3. & finally have you diagnosed & eliminated the root cause of failure ? Our Technical Staff are available 24 hours every day. We really want your replacement compressor to work so if in any doubt please do not hesitate to call Your feedback on our technical bulletins is of great value to us. If this document prevents 1 premature failure then it is worth our while issuing it. Tell us what you think. We will issue a £5 Argos token to any engineer who has read this through and calls to claim quoting TD/TechTip/CPPWS (max 1 per sale).