3
3. INSTALLATION AND STARTUP
3.1. SWITCHING ON
The battery is connected to the control logic by a self-
holding relay which is kept in the OFF state during
storage and shipping (see Section 5.2 for storage and
shipping preparation). When mains power is first
applied, the relay is switched on, and will remain on
during operation. While mains power is on, the battery
is continuously charging.
3.2. THE POWER-ON (“SAFE”) STATE
Following this first switch-on, the CryoSecure enters a
safe state, with the compressor and bias voltage both
held off. The HOLDING, WARMING, and BIAS OFF
LEDs all flash to indicate this state.
The system will return to this safe state if the mains
power input is still off at the end of the warming period.
To begin system operation, press and hold the
INITIALIZE button for more than 5 seconds. The system
will then enter the warming state (see Section 4.1.3).
Release the INITIALIZE button when the LEDs indicate
the change to the warming state.
3.3. INSTALLATION IN A “WARM” SYSTEM
If the CryoSecure is installed in a system with the
detector at room temperature, it is inconvenient to have
to wait for the warming period to elapse before cooling
begins. In this case, the system can be forced from the
warming state directly to the cooling state. To do this,
proceed as in Section 3.2, then press and hold the
INITIALIZE button for an additional 5 seconds. The
WARMING LED will then go out and the compressor
will start. Note that, as for a power failure in normal
operation, the detector bias supply will be held off until
the end of the cooling period.
3.4. INSTALLATION IN A “COLD” SYSTEM
If the CryoSecure is installed quickly enough in a
system with the detector already at working temperature
(i.e., so that the detector has not had time to warm to a
dangerous state), it can be forced into the normal
working state (bypassing the warming and cooling
states) by pressing and holding the INITIALIZE button
for 5 seconds when in the cooling (bias-off) state.
4. OPERATING INSTRUCTIONS
4.1. OPERATIONAL STATES
4.1.1. Normal Operation
During normal operation, the compressor is running and
the detector bias voltage can be applied. The
AC POWER indicator is lit; all other indicators are off.
4.1.2. AC Mains Power Failure—the Holding State
When the CryoSecure detects a mains power failure,
the system enters the holding state. During this state,
the AC POWER and WARMING indicators are off, and
the MAINS FAIL, HOLDING, and BIAS OFF indicators
are lit.
The CryoSecure will remain in this state until either
mains power is restored or the holding time period (as
set on the internal switches) expires. If mains power is
restored within the holding time period, the system will
return to the normal state. If the holding time is
exceeded but the mains power still off, the system will
enter the warming state. The holding time is set by the
factory so the detector will not have time to warm to a
temperature at which damage will occur if cooling
restarts.
4.1.3. The Warming State
In the warming state, the HOLDING LED is off and the
WARMING and BIAS OFF LEDs are lit. The
AC POWER LED is initially off and the MAINS FAIL
LED is lit. The duration of the warming period is set at
the factory with internal switches. If the mains supply is
restored during the warming period, the AC POWER
LED lights and the MAINS FAIL LED turns off.
The system will remain in the warming state, with the
compressor power off and the detector bias supply held
off, until the end of the warming period. At the end of
the warming period, the system will enter the cooling
state. The warming period is set at the factory so that
the detector can warm to a safe temperature before
cooling recommences.
If the mains power supply is still off when the warming
period expires, the system will enter the “safe” power-on
state, described in Section 3.2.
