| Article #kba123tdr |
| Wiring Control (Trigger) Switches from Multiple Time Delay Relays in Parallel |
| Issue |
| I have the control switches from separate 5 OFF Delay time delay relays wired in parallel so one switch can operate all 5 at once. However, when I replaced a unit from another manufacturer with yours, the Macromatic product operated once and then stopped working. What's wrong? |
| Solution/Resolution |
|
All time delay relay functions that are initiated with a control switch
(typically Off Delay, Single Shot, Watchdog & Triggered Delayed Interval)
have some level of voltage potential across the control switch pins
(usually 5-6). In the case of the Macromatic products, that voltage level
is 10VDC. However, on other competitive units, that voltage could be as
high as 120V. Therefore, in the particular application questioned above, if the five original time delay relays all had 120V across pins 5-6, and then one unit was replaced with a Macromatic unit with only 10V, our unit would fail the first time it saw 120V across pins 5 & 6 because the circuitry is only designed to handle the normal 10V. Although this is a rare occurrence, it is a special application where the Macromatic time delay relay cannot be substituted directly in place of a competitive product. For more information, please contact Macromatic Controls. |
| This article applies to the following Macromatic products: |
|
|
Last Reviewed: 08/29/2008 |