3.3 - Screw Compressor Protection Module
This board shall monitor compressor pressure transducer, temperature sensors, oil level, high pressure switch,
motor cooling solenoids, oil pumps, motor current, compressor wye-delta startup and compressor protection.
3.3.1 Screw Compressor Module Layout
N.B :Only Y
✁
✁
✁
✁
dip switch of the 4 is used to configure start-delta startup procedure (when in ON
position), the 3 others shall remain OFF ! If not, MTA header configuration alarm will occur.
Oil pressure
0-5V pressure transducer
4
4
J10B
Economizer pressure
0-5V pressure transducer
3
3
J10A
Discharge Gas Temperature
5K thermistor
2
2
J9
Compressor temperature
5K thermistor
1
1
J9
Usual Functions
Type
Channel#
AI #*
Connector
Current Phase #3
Current sensor 3
-
3
J8
Current Phase #2
Current sensor 2
-
2
J8
Current Phase #1
Current sensor 1
-
1
J8
Usual Functions
Type
Channel#
CT #*
Connector
Oil level
Dry contact
6
2
J6
High Pressure
Dry contact
5
1
J7
Main Functions
Type
Channel#
DI #*
Connector
Loader #2
24VAC, 10VA
Triac
11
8
J2
Loader #1
24VAC, 10VA
Triac
10
7
J2
Motor cooling #2 or economizer valve for
circuit which has 2 compressors
24VAC, 10VA
Triac
14
6
J2
Motor cooling #1
24VAC, 26 VA
Triac
13
5
J2
Oil solenoid
24VAC ,10VA
Triac
12
4
J2
Oil pump
115VAC,145VA,-
Triac
9
3
J4
Compressor output “Y”
115VAC, 70VA,
Relay/TRiac
8
2
J3
Compressor output “D”
115VAC, 250VA
Relay/Triac
7
1
J3
Main Functions
Load max
(Voltage,power)
Type
Channel#
DO #*
Connector
CARRIER SA
USER'S GUIDE FOR
30GX&HX PRO_DIALOG 4 V.2
ECG-UG-02-002
Rev: original
Page: 11/98
©
C
ARRIER
S
.
A
NOT
TO
BE
DISCLOSED
TO
PERSONS
OUTSIDE
CARRIER
ORGANIZATION
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