User Manual – Rev BE AMETEK Programmable Power
MX Series 91
3.12 Remote Inhibit / Remote Shutdown
It may be necessary to provide a remote shutdown of the AC or DC output of
the MX. The external remote inhibit input may be used for this purpose (RI).
This input is also referred to as remote shutdown.
The default mode of operation for the RI input is a contact closure between pins
5 and 6 (return) of the rear panel screw-terminal strip. This will open the output
relay of the MX.
If the firmware revision of the MX is 0.28 or higher, it is possible to reverse the
polarity of the RI input. This requires the use of one of the following bus
commands:
• OUTPut:RI[:LEVel] HIGH /* Sets RI polarity to active
high.
• OUTPut:RI[:LEVel] LOW /* Sets RI polarity to active low
(Factory default)
The remote-control interface must be used to change this setting. Once set, the
polarity setting remains in effect. On units with firmware rev 0.27 or lower, this
input level mode selection is not available.
MX Series I
When set to HIGH, an active low TTL level or a contact closure is required to
enable the output relay of the MX. Opening the contact or removing the low
input signal will cause the output relay to open.
MX Series II
The way the MX responds to a remote inhibit event can be programmed over
the remote-control interface using the OUTP:RI:MODE command. See 7003-961
programming manual for details on changing modes. The mode set is retained
at power off and recalled at power up so stays in effect till changed again over
the bus.
The following modes are supported.
LATCHI NG
A TTL low at the RI input latches the output in the protection shutdown state.
This state can only be cleared by sending a OUTPut:PROTection:CLEar command
over the bus.
LI VE
The output state follows the state of the RI input. A TTL low or contact closure at
the RI input turns the output off; a TTL high or open contact turns the output on.
This mode is equivalent to using the Output On/ Off button on the front
panel.Default mode. Units are shipped in this mode.
OFF
The instrument ignores the RI input.
Table 3-14: Remote Inhibit Mode Settings
NOTE: When using the Remote Inhibit input, it will be necessary to
disconnect any RI connection to the MX master unit when
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