Trane CVHE-SVU01E-ENX39640712050 - Manual (Page 67)

67 CVHE-SVU01E-EN
Current passing through fuse 1F2
reaches 2 normally open parallel sets
of contacts: those of refrigerant and
oil pump relay (1A7-J2-5 to 1), and the
start contactor 2K1-aux. Connecter at
module 1A7-J2-2 to 4.
Note: While the (1A7-J2-5 to 1) relay
automatically is closed by the main
processor 1A22 as a part of the start
sequence. It can also be closed
manually by changing the oil pump
status to “ON” in the manual over
ride mode menu of DynaView
™ .
Closure of the (1A7-J2-5 to 1), or 2K1
auxiliary contacts also allows current
to pass through the coil of the
refrigerant pump starter relay (4K8),
to the start windings of the refrigerant
pump. When motor 4M3 first starts,
current draw is high: This causes
current sensing relay 4K8 to close its
normally open contacts and pull in
pump Capacitor 4C1. Increasing
motor speed and related decreasing
current through the main winding
and relay coil reduce the magnetic
force and the armature “Drops out”
to open the start contacts and
disconnect the start windings and
capacitor. Current now flows only to
the Run windings of the oil pump
motor or refrigerant and oil pump
motor.
Control Sequence
of Operation
Maximum Acceleration
Timer Setting
by Starter Type
Wye-Delta 27 Seconds
Auto-Transformer 16
Primary Reactor 16
Across the Line 6
Solid State 25
AFD 30