A6REL-12 Relay Driver Revision: 7/09 C o p y r i g h t © 1 9 8 5 - 2 0 0 9 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The A6REL-12 RELAY DRIVER 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.
A6REL-12 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. Function........................................................................1 2. Specifications ..............................................................3 3. Powering the A6REL-12 ..............................................3 4. Installation....................................................................4 5.
A6REL-12 Relay Driver 1. Function The A6REL-12 (Figure 1) drives six dual single pole double throw internal relays for control of up to 12 external AC or DC devices. Each of the six relays has a three position toggle switch; "on" and "off" for manual override, and "auto" for datalogger control. In the on position, the common and normally open contacts are shorted (Figures 2 and 3). In the auto position, the state of a relay is controlled by a datalogger control port.
A6REL-12 Relay Driver FIGURE 2. Position of Contacts When Coil IS Energized (ON) FIGURE 3.
A6REL-12 Relay Driver 2. Specifications Operating voltage: 12 VDC nominal (8.4 to 24) Current drain at 12 VDC: 6 μa quiescent; 30 mA per active LED (switch ON or AUTO active). 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.
A6REL-12 Relay Driver 4. Installation The A6REL-12 relay driver includes mounting flanges with keyhole slots that attach to the backplate of a Campbell Scientific enclosure. The A6REL-12 must be 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. Table 1 shows the cables recommended for connecting the relays.
A6REL-12 Relay Driver 5.1 CRBasic Although the following example is a CR1000 program, other dataloggers that use CRBasic such as the CR800 and CR3000 are programmed similarly.
A6REL-12 Relay Driver 5.2 EDLOG Although the following example is a 21X program, other dataloggers that use Edlog such as the CR10(X) and CR23X are programmed similarly. *1 Table 1 Program 01: 5 Sec. Execution Interval 1: Panel Temperature (P17) 1: 1 2: Thermocouple Temp (DIFF) (P14) 1: 1 Rep 2: 1 5 mV slow Range 3: 1 IN Chan 4: 1 Type T (Copper-Constantan) 5: 1 Ref Temp Loc REF TEMP 6: 2 Loc [:TEMP ] 7: 1.
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