Starting screw compressor/prelubric ation in MANUAL mode, continued
Pres s to start compressor.
Light diod e on front fla shes gre en.
Check that input
Starting request feed -
bac k,
te rminals (X3/19-20), is closed.
Digital input diode no. 5 is on . Can a ls o
be chec ked in picture
Se rvice/Diagnos is/
Hardware /Digital input/PMS feedbac k
= 1.
Check that
Se tup/Configuration/
Oil system/Oil pump = Ye s
.
Oil pump
starts?
Error mes -
sage in oil
system ?
PMS
error mes-
sage re-
ceived?
Try a gain
Input
closed?
Apply jumper, or chec k co n-
nections from termina ls
(X12/17-18) to power man -
agement system.
Digital output
Prelub pump is
activa ted.
Digital output diode
no. 2
is on?
Check wiring conne ction
to oil float. When float/
level s witch has been
activa ted, digita l input di-
ode no. 5 will turn on.
Connection
OK?
Correct wiring
connect.
Che ck floa t/level
switch function
Connec tion
OK?
Correct wiring
connection
Check conne ction from terminals (X12/
3-4) to oil pump motor s tarter
Check if feedba ck is received on te rmi-
nals (X3/3-4) from pump motor gua rd.
Digital inp ut diode no. 2 is on
Connection
OK?
Correct wiring
connect.
Che ck pre-fuse s and control voltage of
pump mo tor guard.
2
No
Yes
No
Yes
3
No
Yes
Yes
No
No
Yes
YesNo
No
Yes
Yes
No
Fig. 50: Error diagram no. 3
Troubleshooting
Engineering manual - Unisab III 1.10
001930 en 2014.09
289/319
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