Product manual

24
E2 controller trip set-points & actions (ZX MT & LT units)
Fault Type
Reverse Phase
/ Loss Of
Phase
(3 Phase Only)
Fresh Start
High Pressure
Tri p
Low Pressure
Tri p
(Only in Med
Temp Unit)
Discharge
Gas Overheat
Over Current
Electrical
Failure
Compressor
Rapid Cycling
Trip Set Point
Incorrect voltage
Sequence
If power is reset,
ambient < 35˚C or
compressor off> 1
hour & signal for
compressor start
Contact Open At 3.0
±0.15Mpa
Contact Close At
2.4±0.15Mpa
Contact Open At
0.1±0.05Mpa
Contact Close At 0.2
±0.05Mpa
Discharge
Temperature Over
132˚C
Set Based On
Compressor
Compressor not
drawing current
after compressor
contactor orangized
Minimum 3 minutes
OFF time between
starts
E2 Control Actions
-Lockout unit
-Display Incorrect Phase Sequence on
diagnostic
-Initiate Buzzer/ Dialer Relay
-Compressor runs 3 sec and stops 20 sec
-After 3 cycles, compressor runs
continuously.
-Display fresh start on diagnostic
-Stop the unit
-Display HP trip on diagnostic
-D
isplay waiting to restart on diagnostic
-Auto start the unit after 3 minutes
-L
ockout unit if 6 trips in less than 1 hour
-Display HP lockout on diagnostic
-Initiate Buzzer/ Dialer Relay
-Stop the unit
-Display LP trip on diagnostic
-Display waiting to restart on
diagnostic
-Auto start the unit after 3 minutes
-Stop the unit
-Display DLT trip on diagnostic
-Display waiting to restart on diagnostic
-Auto start the unit after 3 minutes
-Lockout unit if 6 trips in less than 1 hour
-Display DLT overheat lockout on
diagnostic
-Initiate Buzzer/ Dialer Relay
-Stop the unit
-Display over current trip on diagnostic
-Display waiting to restart on diagnostic
-Auto start the unit after 3 minutes
-Lockout unit if 6 trips in less than 1 hour
-Display over current lockout on
diagnostic
-Initiate Buzzer/ Dialer Relay
-Display compressor protector trip on
diagnostic
-Initiate Buzzer/ Dialer Relay
-Auto start when protector reset, turn
off buzzer/Dialer
-Delay comp start, if minimum off
time is less than 3 min
-Display about to turn on diagnostic
Auto Resets
Unit will not
start unless it
is wired
correctly
Auto start
5 Auto starts
in I Hour
Auto Start
5 Auto starts
in I Hour
5 Auto starts
in I Hour
Auto start
Auto start
Possible Error And Solution
-Change voltage sequence at
circuit break.
-Check voltage sequence of the
compressor;
-Nothing is wrong, just wait till
compressor runs continuously.
-Check whether HP cutout is
functioning or is connected to
control board;
-Check whether condenser fan
can run;
-Check liquid line solenoid valve,
liquid service valve are open;
-Check whether evaporator need
de-frost;
-Check return gas service valve, is
open;
-Check LP cutout is functioning or
is connected to control board
-Check liquid line sight glass is full;
-Check whether EXV is functioning
and connected to control board
Check rotary switch, make sure it
is on the right position according
to unit model;
-
Check oil level through compressor
sight glass (Low temp unit only);
- Check whether contactor is pull-in?
If not, check wiring of contactor coil;
-Check wiring, make sure
compressor is connected to
contactor, and is powered;
-Compressor motor thermal
protector trips, wait till it reset.
-Compressor start signal is active
when unit just stops; the only thing
need to do is to wait till unit start.