Penn P545 Series User Manual

Product/Technical Bulletin
Issue Date September 2018
© 2018 Johnson Controls 1
Code No. LIT-12011012 www.penncontrols.com
Part No. 24-7664-2616, Rev. D
P545 Series Electronic Lube Oil Control
The P545 Series Electronic Lube Oil Control is
designed for use on refrigeration compressors
equipped with an oil pump that accepts a single-point
differential pressure switch. The P400 switch
continuously monitors net lube oil pressure and the
P545 control locks out the compressor if lube oil
pressure falls below the manufacturer’s recommended
net pressure for longer than the recommended lube oil
time delay. Front-mount Light-Emitting Diodes (LEDs)
indicate the status of the lubrication system, and a
user-selectable, minimum-off time delay can be set to
minimize compressor short cycling.
A Johnson Controls/PENN® R310AD Current Sensing
Switch, sold separately, may be used to disable the
P545 control lockout circuit during abnormal
compressor shutdowns.
Figure 1: P545 Electronic Lube Oil Control with
P400 Single-Point Oil Pressure Differential Switch
Features and Benefits
 Single-Pole Double-Throw (SPDT)
Relay Contacts for Liquid Line
Solenoid and Alarm Applications
Allows liquid line solenoid to be closed if the
P545 control shuts off the compressor due to low oil
pressure (minimizes refrigerant migration); provides
alarm indication, including circuits that use neon lights.
 Relay Contact Output for
Compressor
Provides reliable, long-lasting operation
 Built-in Test Circuit Verifies proper control operation quickly, without
additional tools or equipment
 Improved Noise Immunity Exceeds immunity requirements of UL 991 for transient
overvoltage: IEC 61000-4-3 for radiated Radio
Frequency (RF) and IEC 61000-4-6 for RF-induced
conducted disturbances
 Selection of Anti-short Cycle Time
Delay
Allows choice of anti-short cycle strategy for a wide
range of equipment requirements; possible elimination
of external short-cycle timer
 User-Friendly Display Panel Displays the status of the compressor lubrication system
continuously
 Backwards Compatibility Allows easy replacement of existing electronic lube oil
controls

Penn P545 Series Specifications

General

Display	LCD
Operating Pressure	0-200 psi (0-13.8 bar)
Air Connections	1/4 in. NPT
Resolution	1 psi (0.1 bar)
Communication Ports	RS-485
Operating Temperature	0°C to 50°C
Storage Temperature	-20°C to 70°C

Summary

P545 Series Electronic Lube Oil Control Features

Relay Contacts for Solenoid and Alarm

Relay Contact Output for Compressor

Anti-short Cycle Delay Selection

Allows selection of anti-short cycle strategy for various equipment needs, potentially eliminating external timers.

P545 Control Technical and Operational Details

Low Oil Pressure Timing Circuit

Explains how the timing circuit operates based on oil pressure levels and manufacturer requirements.

R310AD Switch for False Lockouts

Describes using the R310AD switch to prevent false oil failure lockouts by disabling the delay timer.

Anti-short Cycle Delay Configuration

Details the selectable anti-short cycle delay positions for equipment restart.

Internal and Ladder Wiring Diagrams

Internal Wiring Diagram

Ladder Diagrams for P545 Control

Setup, Adjustments, and Testing

Anti-short Cycle Delay Setting

Operating Status LED Indicators

Electrical Checkout Procedure

Provides a step-by-step procedure to test the P545 control during initial installation and maintenance.

Troubleshooting and Controls

Operational Control Test

Simulates a low oil pressure condition to verify P545 control lockout functionality.

Troubleshooting LED Status

Guides users through diagnosing P545 control issues based on LED status and common problems.

Ordering Information and Specifications

P545 Control and P400 Switch Ordering

Technical Specifications