Rockwell Automation 1395 Encoder Driver Module - Manual

ALLEN-BRADLEY
Encoder Driver Interface Module
Instructions
General The Encoder Driver Interface Module is a multi–purpose pulse amplifier
primarily used for generating 15 milliampere, double ended, sink and
source output signals. These signals are acceptable as inputs to digital
reference and/or digital feedbacks into opto isolated circuits of
Allen–Bradley drive products such as the Bulletin 1395, 1336 PLUS, 1336
FORCE and the 1399. The opto–isolated input signals are designed to
guard against signal common loops and also to provide an improved signal
to noise input circuit.
Module Capabilities The Encoder Driver Interface Module has the capability of handling 2
independent quadrature encoder signals, with inputs designated as AI1
(TB1–1) and BI1 (TB1–2) for encoder 1 and AI2 (TB1–3) and BI2
(TB1–4) for encoder 2 (see Fig.1). These inputs are single ended, as they
all are 0 to 5 volt signals referenced to module common (TB1–6 &
TB1–8). Since the module inputs must be a maximum of 5 volt level,
input resistive voltage dividers for example can be applied to reduce 12
volt encoder levels to the 5 volt level. If it is desirable to “Fan Out” one
encoder that has double ended 0 to 15 milliampere levels, it is
recommended that a burden resistor (330 ohms), be mounted near the
module input (within 300 millimeters (1ft.)) for optimum noise immunity
for each channel.
The module outputs are all differential (or double ended), 0 to 5 volt
signals. The module outputs all have the capability of continuously driving
a total load of at least 45 milliamperes. Encoder 1 module outputs are
denoted AO1 (TB2–1), & NAO1 (TB2–2) for the A Channel and BO1
(TB2–3) & NBO1 (TB2–4) for the B channel. In a similar manner,
Encoder 2 module outputs are denoted AO2 (TB2–7) & NA02 (TB2–3) for
the A channel and BO2 (TB2–9) & NBO1 (TB2–10) for the B channel.
The Encoder Driver Module requires a DC power supply capable of 250
milliamperes minimum. The preferred input voltage is 12 volts, but the
internal 5 volt regulator and heat sink in the module will accept up to a 24
volt input power supply. The Encoder Driver Module also has 4 terminals
internally connected together which are dedicated for signal shield
connections. These terminals are TB1–5, TB1–9, TB2–5 and TB2–6.
Specifications Electrical Input Signal: Single ended; 0 to 5 volts; 0 to 50 Khz
throughput frequency; Input impedance
greater than 100 K ohms.
Electrical Output Signal: Differential; 0 to 5 volts; 0 to 50 Khz
throughput frequency; 45 milliamperes
maximum per output.