P545 Series Electronic Lube Oil Control Product/Technical Bulletin
3
IMPORTANT:
The P545 Series Electronic Lube Oil
Control is intended to provide an input to equipment
under normal operating conditions. Where failure or
malfunction of the electronic lube oil control could
lead to personal injury or property damage to the
controlled equipment or other property, additional
precautions must be designed into the control
system. Incorporate and maintain other devices,
such as supervisory or alarm systems or safety or
limit controls, intended to warn of or protect against
failure or malfunction of the electronic lube oil
control.
IMPORTANT:
Le P545 Series Electronic Lube Oil
Control est destiné à transmettre des données
entrantes à un équipement dans des conditions
normales de fonctionnement. Lorsqu'une défaillance
ou un dysfonctionnement du electronic lube oil
control risque de provoquer des blessures ou
d'endommager l'équipement contrôlé ou un autre
équipement, la conception du système de contrôle
doit intégrer des dispositifs de protection
supplémentaires. Veiller dans ce cas à intégrer de
façon permanente d'autres dispositifs, tels que des
systèmes de supervision ou d'alarme, ou des
dispositifs de sécurité ou de limitation, ayant une
fonction d'avertissement ou de protection en cas de
défaillance ou de dysfonctionnement du electronic
lube oil control.
Low Oil Pressure Timing Circuit Operation
All P545 control timing functions are designed to
comply with compressor manufacturer requirements.
Standard control models de-energize the compressor
contactor if the low-pressure condition lasts longer
than the factory-set time delay.
The oil pressure monitoring circuit on the P545 control
compares the amount of time that the oil pressure is
above opening point to the amount of time that the oil
pressure is below opening point. If the oil pressure is
above opening point more than it is below opening
point, the control does not shut down the compressor.
If the oil pressure drops continuously below the
opening point, the control times out in either 90 or
120 seconds, depending on the model. If the oil
pressure is below opening point more than half of the
time, the control times out but the timing is extended.
This allows the control to protect the compressor when
there are repeated low oil pressure signals interrupted
by short periods of sufficient oil pressure.
R310AD Current Sensing Switch for False Oil
Failure Lockouts
False oil pressure failure lockouts can occur when the
P545 control remains powered despite a loss of power
to the compressor motor (for example, when an
internal motor overload switch trips).
An R310AD switch disables the oil-failure delay timer
when there is no power to the compressor, thus
avoiding false lockouts.
Install the R310AD switch after the main contactor on
one of the compressor power leads, and wire to
terminals W1 and W2 on the P545 control. In addition,
remove resistor R39 by cutting the leads to the circuit
board. See Figure 13.
IMPORTANT:
The R310AD switch does not work
when the control’s anti-short cycle delay timer is set
at 0 seconds. You must set the timer to 35, 65, or
100 seconds. See
Anti-Short Cycle Delay
for further
information.
Anti-short Cycle Delay
Anti-short cycle delay establishes the minimum time
that the controlled equipment is de-energized before
restarting. After the P545 control has de-energized the
equipment, the anti-short cycle delay is activated and
the yellow LED lights. The equipment remains
de-energized for the selected amount of delay time.
The anti-short cycle delay on the P545 control may be
set to 0, 35, 65, or 100 seconds.
Backwards Compatibility
The P545 control and P400 switch offer backwards
compatibility with previous offerings in the
Johnson Controls/Penn product line and operate as
shown in Table 1.
