Installation manual

30
Epsilon EP-B Base Drive Reference Manual
Brake Release
The Brake Release input function will release the brake under all conditions. When this input function is on, the Brake
output function will be on (i.e., release brake). This input function overrides all other brake control, thus allowing the
brake to be released while a fault is active or the power stage is disabled. See also Brake output function.
Brake Control
This input function, when active, will engage the brake unless overridden by the Brake Release input function. This input
lets you externally engage the brake while allowing the drive to also control the brake during fault and disabled
conditions.
Brake
The Brake output function is used to control the motor holding brake. If the Brake output function is off, the brake is
mechanically engaged. When the brake is engaged, the diagnostic display on the front of the drive will display a “b”.
The drive outputs are limited to 150 mA capacity, therefore, a suppressed relay is required to control motor coil. Control
Techniques offers a relay, model; BRM-1.
Analog Command Input
The Analog Command Input can be used as a velocity, torque or analog position command. The drive has one analog
input channel that accepts a +10 V to -10 V signal. The drive has a 12-bit over sampled to 14-bit analog to digital
converter (A/D), which is used to transform the analog voltage to a usable parameter. The analog input is scanned by
the drive every 100 microseconds.
The Analog Inputs Bandwidth, Analog Full Scale and Analog Zero Offset parameters are applied to the Analog Input to
generate either an analog velocity or torque command. These three parameters can be edited using PowerTools Pro or
serially using Modbus.
Bandwidth
This parameter sets the low-pass filter cutoff frequency applied to the analog input. Signals exceeding this frequency
will be filtered at a rate of 20 db per decade.
Analog Full Scale
This parameter specifies the full scale voltage for the analog input. When the drive receives an analog command input
equal to the Analog Input Full Scale parameter, the drive will command either Full Scale Velocity or Full Scale Torque
depending on the operating mode. Valid range for this parameter is -10 to +10 volts.
Analog Zero Offset
This parameter is used to null any input voltage that may be present at the drive when a zero velocity or torque is
commanded by a controller. Valid range for this parameter is a range from -10 to 10 volts.
Analog Outputs
The drive has two 10 bit Analog Outputs which may be used for diagnostics, monitoring or control purposes. These
outputs are referred to as Channel 1 and Channel 2. They can be accessed from the Analog/Sync Output connector (J5).
Each Channel provides a programmable Analog Output Source.
Analog Output Source options are:
• Analog Input
• Velocity Command
• Velocity Feedback
• Torque Command
• Torque Feedback
• Following Error
• Position Feedback
Default Analog Output Source:
Each channel includes a programmable Analog Output Offset and an Analog Output Scale. This feature allows you to
“zoom in” to a desired range effectively increasing the resolution. The units for both of these parameters is dependent
upon the Analog Output Source selection.
Output Source Offset Scale
1 Velocity Command 0 600 RPM/volt
2 Velocity Command 0 600 RPM/volt