Honeywell Minitrend QX, Руководство пользователя

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20 43-TV-25-30 Iss.6 GLO Aug 07 UK
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CH.1 CH.2 CH.3 CH.4 CH.5 CH.6
Figure 2.8
eZtrend QXe
Analogue Input card (std) - Slot A
WARNING
HAZARDOUS VOLTAGES
Insulation from channel to channel: Normally a channel can be safely connected to a
hazardous voltage up to 150V AC common mode* with respect to earth. However,
where a channel is connected to a safety low voltage circuit (i.e. is accessible for op-
erators to touch), any channel within the same 'input bank' must be limited at all times
to a maximum of 55Vac or 140Vdc**. This is to ensure that protection of the safety low
voltage circuit is fully maintained.
The inputs are divided into two banks: inputs 1 to 3 are one bank, and inputs 4 to 6 (if
fitted) are another bank. A voltage of up to 150V AC common mode can be applied on
one bank as long as any safety low voltage circuits are on the other bank. The recorder
is protected against accidental connection of a voltage up to 240V AC common mode
which might occur as a temporary fault condition, provided there are no safety low volt-
age circuits connected to the same input bank as the channel with the fault.
*Common Mode voltage is a voltage applied between the whole channel and earth,
not between pins on a channel.
** this reduces to 33Vrms or 70Vdc if any channel within the input bank is configured
as an ohms or R/T measurement.
Failure to comply with these instructions could result in death or serious injury.