Bently 136188-02 industrial control spare parts PLC module DCS system module

Bently 136188-02 industrial control spare parts PLC module DCS system module

Technical data of product parameters

The power 136188-02 supply hold-up time as described above is generally longer than the
turn-on and turn-off times of the input modules. Because of this, the input
state change from On to Off that occurs when power is removed may be
recorded by the processor before the power supply shuts down the system.
Understanding this concept is important. Write the user program to take this
effect into account. For example, hard-wire power to one spare input. In the
user program, check to be sure that one input is on; otherwise, jump to the end 136188-02
of the program and avoid scanning the logic. Use of a common power source
as recommended in the previous section is assumed.
Power Supply Undervoltage Operation
SLC 500 controllers continue to operate (hold-up) for a short period of time if
the input voltage to the power supply drops below the recommended
operating voltage range. The controller continues to scan the user program
and control I/O during this time. CPU hold-up time is 20 ms…3 s depending
on the power supply and loading.
SLC 500 controllers turn OFF (stop scanning and disable outputs) if input
voltage to the power supply is removed or drops below the recommended
operating range for a period exceeding the CPU hold-up time. The controller
resumes operation automatically when the input voltage is restored to normal. 136188-02
If the input voltage to the 1746-P7 power supply falls into a range of 4…9V for
a period exceeding the CPU hold-up time, the controller turns OFF and will
not turn back ON until the input voltage is increased to 11V dc.Locate the main power disconnect switch where operators and maintenance
personnel have quick and easy access to it. Ideally, the disconnect switch is
mounted on the outside of the enclosure, so that it can be accessed without
opening the enclosure. In addition to disconnecting electrical power,
de-energize all other sources of power (pneumatic and hydraulic) before
working on a machine or process controlled by an SLC controller.Circuits installed on the machine for safety reasons, like overtravel limit
switches, stop push buttons, and interlocks, should always be hard-wired
directly to the master control relay. These devices must be wired in series so
that when any one device opens, the master control relay is de-energized
thereby removing power to the machine. Never alter these circuits to defeat
their function. Serious injury or machine damage could result.

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