Emerson Control Techniques EN-204 - Page 213

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Epsilon Eb and EN Drives Reference Manual
Pulse Mode
Interface: Software selectable differential (RS422) or single ended (TTL Schmitt Trigger)
Maximum input frequency: Differential - 2 MHz per channel; 50% duty cycle (8 MHz count
in quadrature)
Single ended - 1 MHz per channel; 50% duty cycle (4 MHz count in quadrature)
Ratio Capabilities: 20 to 163,840,000 PPR
Input Device = AM26C32
V
diff
= 0.1 - 0.2 V
V
common mode
max = +/- 7 V
Input impedance each input to 0 V = 12 - 17 kOhm
Encoder Output Signal
Differential line driver, RS-422 and TTL compatible
Scalable in one line increment resolution up to 2048 lines/rev of the motor (MG and NT)
Output Device = AM26C31
20 ma per channel, sink and/or source
V
out Hi
@ 20 ma = 3.8 - 4.5 V
V
out Lo
@ 20 ma = 0.2 - 0.4 V
V
out diff
w/100 ohm termination = 2.0 - 3.1 V
V
out common mode
w/100 ohm termination = 0.0 - 3.0 V
I
out short circuit
= 30 - 130 ma
Shunt Resistor Capacity/
Regeneration Capacity
Internal: The internal shunting capacity for
the drive/motor combinations listed below is
based on full speed and peak torque reversal.
EN-204/MG-316: 10:1 Mismatch, Bus
Capacitance
EN-208/MG-455: 5:1 Mismatch, 50W, 50
Ohm
EN-214/MG-4120: 10:1 Mismatch, 50 W, 33
Ohm
External: Bus connections are provided for
connection to external shunt controller. The
EMC model RSR-2 is recommended. The
shunt resistor connected to the RSR-2 must
be 20 Ohms or greater and be limited to 5
ARMS. Multiple RSR-2s can be paralleled to
give additional shunting capacity, but the
current draw through the bus connections on
the drive must be limited to 15 ARMS.
Internal: The internal shunting capacity for
the drive/motor combinations listed below is
based on full speed and peak torque reversal.
Eb-202/NT-212: 5:1 Mismatch, Bus
Capacitance
Eb-203/NT-212: 5:1 Mismatch, Bus
Capacitance
Eb-205/MG-340: 5:1 Mismatch, Bus
Capacitance
External: Bus connections are provided for
connection to external shunt controller. The
EMC model RSR-2 is recommended. The
shunt resistor connected to the RSR-2 must
be 20 Ohms or greater and be limited to 5
ARMS. Multiple RSR-2s can be paralleled to
give additional shunting capacity, but the
current draw through the bus connections on
the drive must be limited to 15 ARMS.
Fault Detection Capability
Low DC bus
High DC bus
Power Stage fault
Logic power
Encoder state
Encoder line break
Motor over temperature
Overspeed
Travel limit (+)
Travel limit (-)
Pulse mode position error
RMS shunt power fault
Function module error
Power-up self test failure
Non-volatile memory invalid
Low DC bus (can be disabled)
High DC bus
Power Stage fault
Logic power
Encoder state
Encoder line break
Drive overtemperature
Motor over temperature
Overspeed
Travel limit (+)
Travel limit (-)
Pulse mode position error
Watchdog timer
Power-up self test failure
Non-volatile memory invalid
EN Epsilon Series
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