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3.5 DRY CONTACT OPERATION
•
An external relay or switch wired to the dry contacts can used as a controller to
operate the pump if the controller is not connected to the RS-485 line.
•
By connecting one of the inputs to common via an external, non-electrified
relay, it will turn on the pump, prime at 100% for 3 minutes, and then go to a
pre-determined speed indefinitely until the circuit is broken (See Figure 6). If no
inputs are jumped to common, the speed is zero.
•
These speed settings cannot be changed. When any controller is connected
through RS-485, all dry contact commands will be ignored.
Dry Contact Speed Settings
Input 1: 100%
Input 2: 75%
Input 3: 52%
Input 4: STOP
NOTE: If more than 1 speed
(Input 1, 2 or 3) is shorted to
common at the same time, the
motor will run the input with the
highest speed. If the STOP
(Input 4) is shorted to common,
the pump stops having priority
over the rest of inputs.
FIGURE 6 - DRY CONTACT SPEED SETTINGS
3.6 CONDUCT PRESSURE TESTING
•
When pressure testing a system with water, air is often trapped in the system
during the filling process. This air will compress when the system is pressurized.
Should the system fail, this trapped air can propel debris at a high speed and
cause injury. Every effort to remove trapped air must be taken, including opening
the valve on the filter and loosening the pump basket lid while filling the pump.
•
Trapped air in the system can cause the filter lid to be blown off, which can result
in death, serious injury, or property damage. Be sure all air is properly purged out
of the system before operating. DO NOT USE COMPRESSED AIR TO PRESSURE TEST
OR CHECK FOR LEAKS.
Installation and general maintenance manual
- VARIABLE SPEED PUMP
Dry Contacts
1 2 3 4
COM
External Enclosure
31
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