Section 2
Considerations before Installation
(b) When the reboot command of the compressor is emitted within 0.3 second from
the operation stop command
(c) When a short power interruption for less than 2 seconds has occurred
In case of the above (a), it takes a few seconds for the compressor to initialize after it
is powered on. Therefore the compressor will neither recognize nor output any remote
signal with the equipment for a maximum of 5 seconds. For reference, the signal
delay when powered on in Alternate operating mode is shown in Figure 2-9.
INPUT POWER SUPPLY
COMP START/STOP
CH1 REF
COMP RUN
CH1 ACK
≧5seconds
Figure 2-9
Signal delay when powered on
(
In Alternate operating mode
)
In the cases of (b) and (c), the answer-back signal is also delayed for a maximum of 5
seconds to respond to the command of “COMP RUN”. This is because the
compressor pump waits to begin its operation until the helium pressure inside
becomes stable. For references, Figure 2-10 shows the signal delay occurred in
Alternate operating mode when the time period from a stop to a reboot is short, and
Figure 2-11 shows the timing chart of C30VR when a short power interruption has
occurred in Momentary operating mode.
From the above-mentioned, the set value of the timeout of the answer-back signal
should be determined based on the condition in which only the compressor has
detected a short power interruption although a user’s equipment is not detecting it
because of differences of the specifications. In this condition, the equipment must
recognize that the compressor is out of order because the equipment side can't
receive the answer-back signal. If dispatch of the answer-back signal will be late for a
preset timeout time even if the compressor has restarted after recovery of the input
power, an alarm of a stop will come out.
Therefore, be sure to set the timeout time of an answer-back signal as 8 seconds or
more in order to monitor the operating conditions of the compressor correctly.
Note: Figure 2-11 leads the following equation:
td + tw + 1
<= 2+ 5 + 1 = 8 (seconds)
Where, “1” second is a margin added.
ULVAC CRYOGENICS INCORPORATED
2-13
Summary of Contents for C30MVER
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