INSTALLATION
The MDMUs are available in either a panel mount or printed circuit board
mount design. The panel mount units are provided with a mounting clip to
securely hold the unit in the panel cutout.
Panel Mount Installation:
1. Cut panel opening to specified
dimensions. Remove burrs
and clean the panel opening.
2. Install MDMU through the
panel cutout as shown in
Figure 1.
3. Slide mounting clip over rear
of unit until clip is against the
back of panel. The unit has
slots for the locking tabs to
hold it in the panel opening.
Note: Hold the MDMU front
bezel in place when sliding the
mounting clip in to position
PCB Mount Installation:
1. Prepare printed circuit board hole pattern to the specifications.
2. Unit should be hand soldered using good soldering techniques and hand
cleaned if necessary.
4.
ANNUNCIATOR
: Flashes at a 1 Hz rate in the Timer mode when the signal
input (CNT) is activated.
5.
CONSTRUCTION
: High impact black plastic case (mounting clip included
with panel mount models).
6
RELATIVE HUMIDITY
: Less than 85% RH (non condensing)
7.
WEIGHT
:
Reflective Panel Mount
: 0.275 oz (7.26 g)
Reflective PCB Mount
: 0.26 oz (6.8 g)
Transmissive Panel Mount
: 0.38 oz (10.43 g)
Transmissive PCB Mount
: 0.356 (9.75 g)
MAXIMUM RATINGS
RATING
SYMBOL
VALUE
UNITS
DC Supply Voltage
V
DD
5.5
VDC
Input Voltage, all inputs
V
IN
-0.5 to (V
DD
+0.5)
VDC
Operating Temperature
T
A
-35 to +85
°C
Storage Temperature
T
STG
-40 to +85
°C
ELECTRICAL SPECIFICATIONS - V
DD
= 5.0 VDC =
10% @ 25
C unless otherwise specified.
SYMBOL
PARAMETER
MIN
TYP
MAX
UNITS
NOTES
V
DD
Supply Voltage
4.5
5.0
5.5
VDC
Voltages outside these parameters may cause display problems
I
DD
Supply Current - Transmissive
20
25
mA
V
DD
= 5.0 VDC - 10 KHz Counting Rate.
I
DD
Supply Current - Reflective
50
100
A
V
DD
= 5.0 VDC - 10 KHz Counting Rate.
V
IH
Valid High Voltage
3.0
VDC
V
IL
Valid Low Voltage
1.5
VDC
I
IN
Input Leakage Current
0.1
1.0
A
Fc
Count Frequency - CNT
9.9
KHz
50% Duty cycle
T
R
,
L
RST, LATCH Pulse Width
30
sec
A
CCTB
Time Base Accuracy
0.025
BEZEL
MOUNTING CLIP
EXISTING PANEL THICKNESS
0.031" to 0.125"
(0.79 to 3.18)
LOCKING
TAB
Figure 1
2
WIRING CONNECTIONS
The electrical connections are
made via terminal pins located on
the back of the unit. The terminal
pins are on 0.100" center lines and
can be mated with the RLC Model
HWK7 cable assembly or many
standard 0.100" center line
connectors. When wiring the unit,
refer to Figure 2 to identify the
wire position with the proper
function.
There are certain considerations
that should be observed when
running the signal wires. A length
of wire can act like an antenna,
and the closer it is to a source of
electrical noise, the more it
becomes susceptible to that noise.
These are a few rules that should be followed when running these wires.
1. Never run signal wires in the same conduit or raceway with A.C. power lines,
conductors feeding motors, solenoids, SCR controls, heaters, etc.
2. Signal wires within enclosures should be routed as far away as possible from
contactors, control relays, transformers, and other noisy components.
3. When shielded wire is used, connect the shield to the common of the MDMU
unit, and leave the other end of the shield disconnected and insulated from
machine ground.
4. Connect common of the MDMU to machine ground at one point only.
V
SS
(GND)
CNT
NO CONNECTION
NO CONNECTION
NO CONNECTION
LATCH
RST
MS1
MS2
MS3
MS4
NO CONNECTION
DP2
DP1
V
DD
Figure 2
