mycom SCV Series User Manual

2205Q2JE-HO-S6-N_2020.01.
Chapter 1 Safety
SCV-series Screw Compressors 1.4 Safety Devices
1-10
1.4.3 Compressor Protection Devices
 Overview/Function/Purpose
To protect the compressor, the following safety functions of the CP4 controller are used.
 Protection against High discharge temperature
This function stops the compressor when the discharge temperature exceeds the set value.
A temperature sensor is installed in the oil separator.
 Protection against High oil temperature
This function stops the compressor when the oil temperature exceeds the set value.
A temperature sensor is installed in the package lubrication piping after the oil cooler.
 Protection against abnormal High pressure
This function stops the compressor when the discharge pressure abnormally rises due to faulty
operation of the compressor or insufficient cooling water supply to the condenser.
This function prevents explosion of the equipment and components.
A pressure sensor is installed in the oil separator.
 Protection against abnormal Low suction pressure
This function stops the compressor when the suction pressure is below the set value.
A pressure sensor is installed in the suction piping.
 Protection against abnormal oil pressure
This function stops the compressor when oil supply is not sufficient, the oil filter is clogged, too
much refrigerant in oil, or oil supply pressure difference (from suction pressure) is below the set
value. This is to protect the compressor from wear and seizure.
A pressure sensor is installed in the package lubrication piping after the oil filter.
 Protection against oil filter Differential pressure
This function stops the compressor when the differential pressure between discharge and
lubrication pressure is below the set value due to clogging of filters or other reasons.
The discharge and the oil pressure sensors is used.
 Protection against Low oil level
[Case 1 Differential pressure oil supply system]
This function continuously detects the oil level in the oil separator and stops the compressor when
the oil level is below the lower limit.
Oil level sensor is installed in the oil separator.
[Case 2 Forced oil supply system]
When the oil level gets lower and the oil pump takes in the refrigerant gas, the differential pressure
between before and after the oil pump decreases. When the differential pressure between before
and after the oil pump is less than the specified value, the system will stop the compressor
operation.
 Protection against motor over-current
When motor current exceeds the set value (upper limit), it stops the compressor..
The current value is monitored by MAYEKAWA controller.

mycom SCV Series Specifications

General

Brand	mycom
Model	SCV Series
Category	Air Compressor
Language	English