Functional description
Carrier controller
Operating Instructions, 09/2013, A5E03474162-02
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Main modules
Main modules of the EMS400S carrier controller:
●
S7-1212C CPU
The CPU generates the setpoint and the control signals for the frequency converter,
controls the communication with the plant segment controller and the display unit; it also
polls the sensors and monitors the fan.
The CPU controls the frequency converter and therefore acceleration, velocity and
stopping of the EMS carrier.
●
PSB-C module
The PSB-C module communicates with the PSB-S module of the plant segment controller
that is assigned to the plant segment in which the EMS carrier is currently present. Data
is sent and received serially.
The PSB-C module also communicates with the display unit.
●
Display unit
The display unit is located on the front of the carrier controller. If configured, it displays
the current operating states and messages regarding the EMS carrier.
For information about the display unit, refer to the "EMS400S Display Unit and IR Remote
Control" operating instructions.
●
Frequency converter
You need an MM440 frequency converter to control the geared motor for driving the EMS
carrier. You can adjust the speed of the geared motor along a linear ramp from zero to
maximum.
If a non-self-locking gear is used, the geared motor can act as generator during coasting.
The converted energy is dissipated as heat energy by means of a brake resistor.
The operating instructions for the main modules mentioned are available at:
Overall SIMATIC documentation (
http://www.siemens.com/simatic-tech-doku-portal
Geared motor on the EMS carrier
The EMS400S carrier controller has been designed for the following types of gears:
●
Geared motor with non-self-locking gear
You frequently need to connect a brake resistor when using a gear without self-locking
function, for example, a helical gear or bevel gear. The result mainly depends on the
characteristics of the travel. The brake resistor is activated automatically when the motor
feeds back regenerative energy to the DC link of the frequency converter.
●
Geared motor with self-locking gear
Use of a self-locking gear on the EMS carrier prevents the generator mode. Its is not
necessary to connect a brake resistor.
