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4.1
Introduction
The information in this section is formatted as follows:
4.2
Power limits : Summarizes the maximum power
limits of the Model 7013 switch card assembly.
4.3
Mainframe
control
Summarizes programming steps to control the
switch card from the Model 7001 Switch System
mainframe.
4.4
Relay switching examples : Provides some typi-
cal applications for using the Model 7013.
4.5
Measurement considerations : Reviews a num-
ber of considerations when using the Model 7013
to make measurements.
4.2
Power limits
CAUTION
To prevent damage to the card, do not
exceed the maximum signal level
specifications of the card. For reactive
loads, be sure to use voltage clamp-
ing and current limiting as explained
in paragraph 4.2.2.
of
switching
card
4.2.1
Maximum signal levels
To prevent overheating or damage to the relays, never
exceed the following maximum signal levels:
DC signals: 110V between any two pins (termi-
:
AC signals: 125V rms or 175V AC peak
4.2.2 Reactive loads
Operation is specified for resistive loads. Reactive
loads require voltage clamping (for inductive loads)
and current surge limiting (for capacitive loads) to pre-
vent damage to the relays and to external circuitry.
Inductive loads Inductive reaction voltage, must be
limited to less than 110V in DC circuits or 175V peak in
AC circuits. Also consider the load when determining
the voltage limit. Clamping circuits that can be used
are shown in Figure 4-1.
Operation
nals), 1A switched, 30VA (resistive
load)
between any two pins (terminals),
1A switched, 60VA (resistive load)
4
4-1
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