SDM-CD16AC 16 Channel AC/DC Controller
2
2. Control Specifications
Operating temperature:
–25 to 50 °C
Operating voltage:
12 VDC nominal (11 to 18 VDC)
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; 6 m (20 ft) (for many
applications); lengths longer than 6 m
(20 ft) may be possible for CRBasic data
loggers if the
SDMSpeed()
instruction is
used
Toggle switch:
ON/OFF manual override; AUTO for data
logger control
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:
11 to 18 VDC
Coil resistance:
360 Ohms
±
10%
Expected life (contact closures):
Mechanical 10
7
Actuation/release time:
Approx. 4 ms
Standards:
Underwriters Laboratories (UL) listed
product (E162021)
Canadian Underwriters Laboratories
(CUL) listed product (5Z21)
3. Power Considerations
The SDM-CD16AC power requirements are large compared to most Campbell
Scientific products. For most applications, an external power supply (see
) is recommended to power the SDM-CD16AC.
For some applications, it may be convenient to use the data logger supply to
power the SDM-CD16AC (see FIGURE
). For long-term applications, the
lead acid power supply available with Campbell Scientific data loggers should
be used, allowing the batteries to be float charged. It is not recommended that
the data logger alkaline supply be used to power the SDM-CD16AC for long-
term applications due to its large power requirements.
