Specifications

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March 2014
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2
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In1 –
In1 +
24
VAC
24 VAC
Power
Wiring Typical
To Pulse
Counter
Circuitry
+
–
Out1 +
Out1 –
In2 –
In2 +
Out2 +
Out2 –
O
F
F
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F
F
Pulse Ratio Rescaling Instructions
The UPD is factory set to provide one output pulse for 10 input pulses. This
ratio is easily changed in the field. Each switch is assigned a pulse value
shown in the table below. Simply turn “ON” the combination of switches that
adds up to the number of input pulses you would like each output pulse to
represent. For example, if you would like each output pulse to represent 100
input pulses, turn on the following:
Switch 3 4
Switch 6 32
Switch 7 64
Total 100
Contacts at
Monitored Device
Switch ON Value
1 1
2 2
3 4
4 8
Switch ON Value
5 16
6 32
7 64
8 128
DIP Switch Divider
Input Frequency (pulse/second)
output pulse period (seconds) =
Note: Make divider even number for equal time high and low pulse.
Supply Voltage 24 VAC ±10%
Supply VA
UPD-2 2.5 VA
UPD-4 5.0 VA
Input Mechanical switch contact or open-
collector transistor
Input Signal Factory set scale 10:1; DIP switch
adjustable range 1:1 to 255:1
Input Pulse Time Contact minimum open or close
time 10 ms, maximum frequency
50 Hz
Wiring Terminations Screw terminals
Output 30 VDC, 6 mA maximum contact
rating (observe polarity)
Operating Temperature 32° to 158°F (0° to 70°C)
Operating Humidity 0% to 95% RH (non-condensing)
Dimensions
UPD-2 3.3"H x 4.1"W x 1.0"D
(8.3 x 10.5 x 2.5 cm)
UPD-4 3.3"H x 8.3"W x 1.0"D
(8.3 x 21.0 x 2.5 cm)
Weight 0.5 lb (0.23 kg)
RoHS Statement Ye s
Warranty 18 months
UNIVERSAL PULSE DIVIDER
UPD SERIES
DESCRIPTION
The UPD Series universal pulse divider accepts pulse signals
from devices such as electric meters and flow sensors,
rescales these pulses, and provides an isolated pulse
output. This allows the receiving devices to monitor higher
frequencies than they are able to accept directly. The UPD-2
provides two separate channels and the UPD-4 provides four
channels. The output pulse signal is optically isolated from the
input signal and each channel is isolated from the others.
FEATURES
• Two or four channels
• Optically-isolated signals
• 24 VAC power
• Snap-track mounted
• User-adjustable pulse divider ratio
• Operates with mechanical switch or open-collector
transistor devices
WIRING
APPLICATION
The function of the UPD Series is to count input pulses and
produce one output pulse for a specified number of input
pulses. The pulse ratio from the UPD is user-adjustable
through an eight-position DIP switch and may represent
from one to 255 input pulses. An input pulse is defined as
a contact opening, then closing, and then re-opening. The
duty cycle or contact open/close ratio does not need to be
exactly 50%. The input pulse rate may not exceed 50 pulses
per second. The minimum open or closed time, whichever is
shorter, must not be less than 10 milliseconds.
SPECIFICATIONS
ORDERING INFORMATION
MODEL DESCRIPTION
UPD-2 Universal pulse divider, two channel
UPD-4 Universal pulse divider, four-channel
Make all connections according to the diagram below or
as shown on the job diagrams and in compliance with
national and local codes. Make all connections with the
power removed. Failure to do so could result in circuit board
damage.