Carrier AquaForce PUREtec 30XWHPZE 301 Installation, Operation And Maintenance Instructions page 28
Water-cooled liquid chillers and heat pump with r-1234ze(e) or optionally with r-515b refrigerant
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10 - MAJOR SYSTEM COMPONENTS AND OPERATION DATA
10.8.7 - State diagram
The logic of the relay is illustrated per below state diagram during normal operation:
A1/A2
(supply)
INF
(feedback circuit)
SP-F
(HPS sensor)
SP-FA
(HPS sensor)
Safety related
outputs
Typical
Power-up
situations:
Auto-check of contactor
feedback circuit and
HPS sensors inputs
10.8.8 - safety LED displays
The state of the safety relay can be visually checked through the device LED displays:
LED
DEVICE
Green
Green
OFF
(1) after power ON
28
Both HPS
sensor trip
Normal operation
Restart allowed after
incl. standby
auto-check of contactor
feedback circuit and
HPS sensors inputs
Normal operating conditions
Line supply
OUT
Green
ON
OFF
ON
OFF
Restart
Only one HPS
Power-up
sensor trips
Auto-check of contactor
feedback circuit and
HPS sensors inputs
Restart not allowed due
to discordance of HPS
sensor inputs
HPS sensor
Closed
Open
Cross circuit or no power supply
Restart
Auto-check of contactor
feedback circuit prevents
from restart due to
malfunction of contactor
One or bothes
HPS sensor trips but
contactor feedback circuit
stays open (contactor failure)
Abnormal operating conditions
Safety related
Contactor feedbacks
Closed
(1)
-
contacts
Closed
Open
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