Edwards TCU 40/80 User Manual

2.4 Safety features
The safety features listed in Table 1 are designed into the TCU 40/80.
Table I - Safety features
Component
EMERGENCY OFF
button (EMO)
Remote EMERGENCY
OFF
Drawer safety switch
Pressure switch
Condenser pressure relief
valve
Reservoir pressure relief
valve
Temperature switch
Coolant flow switch
Coolant float switch
Coolant float switch
Thermal overload
Surge suppression
Line phase monitor
Current sensor
Secondary containment
Ref. des.*
(PB1)
(J72J2)
(LSD
(PS1)
(W2)
(Wl)
(TS1)
(FS1)
(LLS1)
(LLS3)
(K3)
VR1-4
PMR1
CSR1
Function
Shuts off power to major system components.
Remote shut off of power to major system components.
Upon opening the drawer, shuts off power to major system
components.
Protects the refrigeration system against high discharge
pressure. Interrupts operation at 300 psig.
Vents refrigerant to the atmosphere above 350 psig. Fail
safe for PS1, works even if there is no power applied to the
system.
Protects the reservoir from over-pressure.
Protects the process fluid from exceeding 99 °C
Protects the process equipment from inadequate coolant
flow rates.
Protects against low level in the coolant reservoir by
stopping the equipment.
Protects against overfill of the coolant reservoir. Indication
on front and rear panels.
Protects the pump motor from excess current.
Protects the TCU 40/80 against voltage surges and power
line transients.
Protects the equipment against incorrect wiring of the
supply phases and low voltage burn-out.
Protects the compressor against abnormal conditions.
Captures fluids (internal to the TCU) in the event of a leak.
• See Figure 3 on page 9.
TCU 40/80 Temperature Control Unit

Edwards TCU 40/80 Specifications

General

Brand	Edwards
Model	TCU 40/80
Category	Control Unit
Language	English