TREND NX Variable Speed Drives - Manual (Page 17)

Installation on a Trend System
2.2.4 NX drive with parallel motor operations
In this application, the drive operates 2 motors which are separately isolated by
two local isolators (L1 and L2). Since the NX drive is supplying both motors
in parallel it cannot individually protect them, so each drive has an in-built
thermistor relay which will operate if the motor overheats. TH1 will de-
energise C1, and TH2 will de-energise C2. As the start connection between
terminals 6 and 8 consists of C1 and C2 in series, if either motor is isolated or
overheats, both motors will be switched off.
NX Variable Speed Drives Installation Manual TG200434 Issue 3/A 04/07/2006 15