The EASA Technical manual shows the following meanings for the suffixes on your 42 frame motor.
C = C Face mounting on drive end of motor
Y = Special mounting dimensions (Call Manufacturer)
Z = Special extension to shaft length or double shaft
Not much help. I think you need to contact the...
My application experience has shown me that with a standard volts/hertz drive, the torque produced by the motor will drop off exponentially at about 17 HZ. If you need to run slower, you may need to get a drive capable of open loop vector or a vector drive which with encoder feedback will allow...