SDM-CD16AC 16 Channel
AC/DC Controller
Revision: 12/08
Copyright © 1987-2008
Campbell Scientific, Inc.
Warranty and Assistance
The SDM-CD16AC 16 CHANNEL AC/DC CONTROLLER is warranted
by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and
workmanship under normal use and service for twelve (12) months from date
of shipment unless specified otherwise. Batteries have no warranty.
CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to
repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective
products. The customer shall assume all costs of removing, reinstalling, and
shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL
SCIENTIFIC, INC. will return such products by surface carrier prepaid. This
warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products
which have been subjected to modification, misuse, neglect, accidents of
nature, or shipping damage. This warranty is in lieu of all other warranties,
expressed or implied, including warranties of merchantability or fitness for a
particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special,
indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
SDM-CD16AC Table of Contents
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1. Function........................................................................1
2. Control Specifications.................................................2
3. Power Considerations.................................................2
4. Installation.................................................................... 3
4.1 Wiring.......................................................................................................4
4.1.1 SDM-CD16AC Power and Control Connections ...........................4
4.1.2 Controlled Device to SDM-CD16AC Connections........................5
4.1.3 Motor Control.................................................................................6
5. Address Selection Switches.......................................7
6. Datalogger Programming............................................8
6.1 CRBasic Programming.............................................................................8
6.1.1 SDMCD16AC Instruction ..............................................................8
6.1.2 SDMSpeed Instruction....................................................................9
6.2 Edlog Programming................................................................................ 11
7. Theory of Operation ..................................................11
8. Program Examples....................................................12
8.1 CRBasic Example...................................................................................12
8.1.1 Controlling Two SDM-CD16ACs................................................12
8.1.2 Control Temperature and Fans......................................................12
8.2 Edlog Example .......................................................................................15
Figures
1. SDM-CD16AC Face Panel.........................................................................1
2. Connection Block Diagrams.......................................................................3
3. Switch Operation........................................................................................5
4. Typical Wiring Application........................................................................6
5. SDM-CD16AC Relay Outputs to MCC .....................................................7
6. Addressing..................................................................................................8
i
SDM-CD16AC Table of Contents
Tables
1. Datalogger to SDM-CD16AC Connections............................................... 4
2. Base 10 to Base 4 Reference Chart............................................................9
3. Bit Period Values..................................................................................... 10
ii
SDM-CD16AC 16 Channel AC/DC Controller
3
16
4
C2
C2
5
16
C2
C2
C2
6
16
C2
C2
C2
7
16
C2
C2
8
C2
16
C2
9
C2
C2
16
C2
10
C2
C2
16
11
C2
C2
C2
16
12
C2
C2
13
C2
16
C2
14
C2
C2
16
15
C2
ON
OFF
AUTO
+12V
GND
C1
C2
C3
C2
16
C2
C2
C2
C2
C2
16
16
C2
C2
C2
16
C2
C2
SDM-CD16AC
16 CHANNEL AC/DC CONTROLLER
LISTED
5Z21
U
L
2
1
ADDRESSES
2
1
Logan, Utah
3
0
3
0
INDUSTRIAL CONTROL EQUIPMRNT
U
L
FIGURE 1. SDM-CD16AC Face Panel
INPUT: 12 VDC
LOAD: 5 A 277 VAC 1/6 HP
5 A 125 VAC 1/10 HP
S/N:
ON
OFF
AUTO
1
16
C2
C2
16
C2
2
C2
C2
16
C2
C2
C2
C2
C2
MADE IN USA
1. Function
NOTE
The SDM-CD16AC has 16 AC/DC relay control ports (see Figure 1). Each relay
port can be controlled by a datalogger or controlled manually with a manual
override toggle switch.
The toggle switch has three positions; "ON" and "OFF" for manual override,
and "AUTO" for datalogger control. In the "ON" position, the common
(COM) and normally open (NO) contacts are closed (see Figure 3). In the
"AUTO" position, the state of the relays are controlled by the datalogger
control ports.
The SDM-CD16AC is a synchronously addressed datalogger peripheral.
Three ports on the datalogger are used to address the SDM-CD16AC, then
clock out the desired state of each of the 16 control ports. Up to 16 SDMCD16ACs may be addressed, making it possible to control a maximum of 256
ports from the three datalogger ports.
In CRBasic, the SDMCD16AC instruction is used to control the SDMCD16AC. In Edlog, either I/O Instruction 104 (CR10(X), CR23X, 21X) or
Instruction 29 (CR7) is used.
Ensure that the datalogger contains the appropriate instruction
prior to system deployment. The SDM-CD16AC is not
compatible with our CR200-series, CR500, or CR510
dataloggers.
1
SDM-CD16AC 16 Channel AC/DC Controller
2. Control Specifications
Operating voltage: 12 VDC nominal (9 to 18).
Current drain at 12 VDC: 6 mA quiescent; 45 mA per active LED (switch on
or auto active).
Total cable length: cable lengths should be kept as short as possible; 20 ft (for
many applications); lengths longer than 20 ft may be possible for CRBasic
dataloggers if the SDMSpeed instruction is used; 600 ft (possible for CR7)
Toggle switch: ON/OFF manual override; AUTO for datalogger control.
Underwriters Laboratories (UL) and Canadian Underwriters Laboratories
(CUL) listed product. UL and CUL listing number is 5Z21.
RELAY SPECIFICATIONS
Arrangement: Single pole double throw, Break before make
Contact material: Gold-clad silver
Individual contact rating: 5 A at 30 VDC, .3 A at 110 VDC, 5 A 1/10 HP at
125 VAC, 5 A 1/6 HP at 277 VAC
Coil voltage: 9 to 18 VDC
Coil resistance: 360 Ohms•±10%
Expected life (contact closures): Mechanical 10
Actuation/Release time: Approx. 4 ms
Operating temp.: -40° to 70°C
3. Power Considerations
The SDM-CD16AC power requirements are large compared to most CSI
products. For most applications an external power supply (see Figure 2) is
recommended to power the SDM-CD16AC.
For some applications it may be convenient to use the datalogger supply to
power the SDM-CD16AC (see Figure 2). For long-term applications, the lead
acid power supply available with CSI dataloggers should be used, allowing the
batteries to be float charged. It is not recommended that the datalogger
alkaline supply be used to power the SDM-CD16AC for long term
applications.
If the datalogger lead acid supply is used, the number of SDM-CD16AC's that
can be powered is limited by the 300 mA current sourcing capability of the
wall charger. With a continuous 6 mA current drain per SDM-CD16AC and
45 mA per active LED, a maximum of 6 LEDs may be powered by the
datalogger, after which, more current is drawn than can be sourced by the wall
charger. If this condition is maintained, it will ultimately lead to battery deep
discharge, requiring new batteries.
7
2
SDM-CD16AC 16 Channel AC/DC Controller
SDM-CD16AC
SDM-CD16AC
EXTERNAL
9 TO 18 VDC
+ —
GND
12 V
C1 or SDM-C1
C2 or SDM-C2
C3 or SDM-C3
Connection With External Supply
GND
12 V
C1 or SDM-C1
C2 or SDM-C2
C3 or SDM-C3
Connection with Datalogger Supply
FIGURE 2. Connection Block Diagrams
DATALOGGER
DATALOGGER
4. Installation
If the 21X power supply is used to power the SDM-CD16AC, all low level
analog measurements (thermocouples, pyranometers, thermopiles, etc.) must
be made differentially. This is a result of slight ground potentials created
along the 21X analog terminal strip when the 12 V supply is used to power
peripherals. This limitation reduces the number of available analog input
channels and may mandate an external supply for the SDM-CD16AC.
• The SDM-CD16AC must be installed in an enclosure that provides a
pollution degree 2 environment (normally, only nonconductive pollution.
However, a temporary conductivity caused by condensation may be
expected). All Campbell Scientific enclosures meet this requirement.
• Use copper conductors only.
• Wire Range: 30 − 14 AWG
• Tightening Torque: 5 − 7 in./lb.
• Use minimum 60/75 degree C wire.
• Input power must be connected to a class 2 supply only. All Campbell
Scientific power supplies meet the class 2 supply requirements.
3
SDM-CD16AC 16 Channel AC/DC Controller
CAUTION
Cables connecting the terminals of the datalogger and
SDM device should be kept as short as possible to
minimize the risk of corruption of the signals and damage
from induced surges. Where long cable runs (>3 m) are
unavoidable and the cables run outside, some extra
protection may be required for the SDM control terminals.
Please contact Campbell Scientific for further advice.
When connecting wires to the SDM signal terminals please
ensure they are at ground potential before making the
connection, e.g. by touching them to the earth terminal.
For datalogger connections, see Table 1.
Multiple SDM-CD16AC's may be wired in parallel by connecting the
datalogger side of one SDM-CD16AC to the next. The CABLE5CBL-L or an
equivalent cable is used to connect the module to the datalogger. A 1-ft cable
length should be sufficient when both datalogger and SDM-CD16AC are
housed within an ENC12/14; a 2-ft length may be required if the datalogger
and SDM-CD16AC are housed at opposite ends of an EN16/18 enclosure.
CRBasic dataloggers should use the SDMSpeed instruction if the cable length
is longer than 20 feet. The maximum recommended cable length for the CR7
is 600 feet. For other Edlog dataloggers, the maximum recommended cable
length is 20 feet.
NOTE
SDM cables in noisy environments need to be suitably shielded.
4.1 Wiring
4.1.1 SDM-CD16AC Power and Control Connections
Refer to Figure 2 and Table 1 for SDM-CD16AC operating power and control
connections to the datalogger.
TABLE 1. Datalogger to SDM-CD16AC Connections
(see caution)
Connection
Order
First 12 V 12 V on datalogger or Power
external supply
Second Gnd Gnd Common ground
C1 SDM-C1 (CR3000,
C2 SDM-C2 (CR3000,
C3 SDM-C3 (CR3000,
SDM-CD16AC Datalogger (see note) Function
CR5000) or C1 (other
dataloggers)
CR5000) or C2 (other
dataloggers)
CR5000) or C3 (other
dataloggers)
Data
Clock
Enable
4
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