CSZ EZT-570i, Техническое руководство

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EZT-570i Technical Manual
48
7.1.1 Input Description of Use
Chamber Limit (I0): The chamber limit input is used to indicate that the chamber
temperature safety has tripped. This input is active high, i.e., the
input must be on in order for the alarm to be indicated. When
active, the EZT shuts down the chamber until the alarm is
acknowledged (silence button pressed on alarm monitor screen)
and the input is no longer active (requires manual reset of
chamber limit device).
Product Safety (I1): The product safety input is used to indicate that the redundant
product safety has tripped (if equipped). This input is active
high, i.e., the input must be on in order for the alarm to be
indicated. When active, the EZT shuts down the chamber until
the alarm is acknowledged (silence button pressed on alarm
monitor screen) and the input is no longer active (requires
manual reset of product safety).
Motor Overload (I2): The motor overload input is used to indicate that a motor
overload relay has tripped off due to a motor overload condition
(if equipped). This input is active high, i.e., the input must be on
in order for the alarm to be indicated. When active, the EZT
shuts down the chamber until the alarm is acknowledged
(silence button pressed on alarm monitor screen) and the input is
no longer active (requires manual reset of motor overload).
It may also be used to indicate a failure of a VFD if one is used
to control motor speed. If the VFD is at fault, check the
manufacturer’s manual for troubleshooting and diagnostic
information. Typically, pressing the stop/reset button on the
drive should clear the fault condition.
Sys1 Hi/Lo Pressure Safety (I3): The system 1 hi/lo pressure safety input is used to indicate that
the system 1 compressor has exceeded its high or low pressure
operating range. This input is active low, i.e., the input must be
off in order for the alarm to be indicated. When active (input off),
the EZT shuts down the chamber until the alarm is
acknowledged (silence button pressed on alarm monitor screen)
and the input is on (requires manual reset of high pressure
safety).
Sys1 Discharge Thermostat (I4): The system 1 discharge thermostat input is used to indicate that
the system 1 compressor discharge temperature has exceeded
the maximum operating range (if equipped). This input is active
low, i.e., the input must be off in order for the alarm to be
indicated. When active (input off), the EZT shuts down the
chamber until the alarm is acknowledged (silence button pressed
on alarm monitor screen) and the input is on (automatically
resets after allowed to cool down).