T R O U B L E S H O O T I N G T R E E S
MN-36008 (Rev. 8) 01/16 • COMBITHERM CT EXPRESS • D-17
Two Speed Motor - No Low Speed Motor Operation
(with motor protection switch)
Is F-51 motor protection
switch (MPS) in the start
position?
L1/A1 from RBH X3/304,
L2/A2 from N7 High limit
Is K-52 contactor closing?
Reset switch and test
operation
No
Yes
Yes
No
Is K-52 contactor coil
energized?
No
Yes
Replace K-52 contactor
Repair wiring between K-52/A2
and K-52/4
Is L1 power at terminal 4 of
K-52 contactor?
No
Is L1 power at terminal 3
of K-52?
Replace K-52 contactor
Is motor relay coil
energized?
L1/14 from TB 16, L2/13 from N7
high limit through motor high limit
Is L1 power at black wire
on motor?
Repair wiring between K-52/3
and motor
Is L2 power at terminal 12
of motor relay?
No
Yes
No
Yes
Yes
L2/12 from TB 14/2
Is motor running?
No
Yes
Is L2 power at terminal 8 of
motor relay?
No
Yes
Is there voltage across
black/white wires at motor?
Repair wiring between
motor relay and motor
No
Yes
Yes
No
No
Yes
Replace motor relay
Ohm out motor and replace
if necessary
Low speed operation is ok
Содержание CT EXPRESS 4 10ESi
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