
9
KI-OM-6768 R0
Chapter 1
Table 1.2 Control Component Identification
Fault Relay
Low Water Level
R2
The fault relay de-energizes during fault when the normally
closed contact on the float level de-bounce timer is open. The
timer is triggered by the normally closed contact of the float
switch. This arrangement is used to reduce nuisance faults
attributed to level switch vibration or bouncing.
The normally open contact R2/1 is used in the safety circuit to
remove power from the pump and heaters during fault.
The normally open contact R2/3 is used to interlock the relay.
To reset the fault circuit, the fault reset push button must be
pressed.
Fault Relay
(controller)
Over Temperature
R3
This relay is activated by the controller output. The normally
closed contact R3/1 of the relay is used in the over-temperature
relay R1 circuit.
Switch Push Button
Motor Start/Stop
S2
This switch is used to make and break the circuit to the motor
contactor and the heater selection switches. This is the main
start/stop switch for the unit.
Switch Rotary 2p
Heater Selection
S3-S7
The heater ON/OFF switches control the switching of power to
the coils of the respective heater contactors.
Switch
Fault Reset
S8
The fault rest switch unlatches the over-temperature and low
level fault interlocks and allows normal function.
Switch Mushroom
Emergency Stop
S9
This switch contact de-energizes the motor and heater control
circuits. The pump and heaters are switched off but the
controller and safety circuits remain energized.
Switch
Float
S10
The float switch mounted in the level control tank is used to
prevent the system function if the water level in the heater tank is
low. The contact is used to activate the de-bounce timer.
Timer
T1
The de-bounce timer is used to eliminate nuisance faults due to
the bouncing of the float switch in the level control tank. The
normally closed contact T1 is used to de-energize the low level
relay R2. Timer is factory set to 2 seconds.
Component
Component ID
Function Description
Содержание KI40018AA
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