Grundfos SLC Series Installation And Operating Instructions Manual page 29

9.7.4 DLC, transducer-controlled option
The control panel can perform the functions listed below. Depending on the number of float switches for your application, some functions
may be omitted or combined.
• This preset level activates the alarm indication on the screen and the audible alarm when the level is
High Level Alarm • Press the Push-to-Silence button on the side of the control panel to silence the audible alarm.
• The alarm indication on the screen will remain on until the level is lowered, and the audible alarm will
• The lag (standby) pump (both pumps will be on) will start at the preset pressure of the level sensor for
Lag Pump On
• Both pumps will continue to run together until the level sensor pressure reduces below the preset
• The lead (duty) pump will start at the preset pressure of the level sensor for lead (duty) pump operation.
Lead Pump On
• The lead (duty) pump will run until the level sensor pressure is reduced below the preset pumps-off
• Both pumps will stop when he level sensor pressure is reduced below the preset pumps-off level if the
Pumps Off
• The pumps will stop when the liquid level is lowered to this level for more than two seconds.
• Pumping will be disabled in both the automatic modes.
• The alarm indication on the screen and the audible alarm will be activated.
Redundant Off & Low Level
Alarm
• Press the Push-to-Silence button on the side of the control panel to silence the audible alarm.
• The alarm indication on the screen will remain on until the liquid level is raised.
• The audible alarm will reactivate in 12 hours if the alarm condition is not corrected.
• If the transducer signal drops below 3 mADC, a transducer failure alarm will be activated.
Transducer Failure • The alarm indication on the screen and the audible alarm will be activated.
• A message will be shown on the screen.
• This float switch activates the alarm indication on the screen and the audible alarm when lifted for
• This float switch also starts both pumps. Both pumps will run until the high-level pump run time has
High Level Alarm
• Press the Push-to-Silence button on the side of the control panel to silence the audible alarm.
• The alarm indication on the screen will remain on until the float switch is lowered, and the audible alarm
• This float switch stops the pumps when lowered for more than two seconds.
• This float switch is a backup float switch which will operate if the transducer fails.
• Pumping will be disabled in both the automatic and manual modes.
Redundant Off and Low
• This float switch also activates the alarm indication on the screen and the audible alarm.
Level Alarm
• Press the Push-to-Silence button on the side of the control panel to silence the audible alarm.
• The alarm indication on the screen will remain on until the float switch is lifted.
• The audible alarm will reactivate in 12 hours if the alarm condition is not corrected.
• The pump failure is activated when the pump overtemperature sensor, seal failure sensor, or overload
Pump Fault* • A pump failure will activate the alarm indication on the screen, the audible alarm, and an alarm message
• Press the Push-to-Silence button on the side of the control panel to silence the audible alarm.
* To determine a pump seal failure, overtemperature or overload failure trip, open the dead-front inner door and look for the following
relay conditions:
Overload relay: When the overload relay trips, the trip indicator is present on the device. The overload relay can be reset by pressing
the blue reset button. The overload relay can be switched to manual or automatic resetting.
K02: This relay is active when the overtemperature sensor in the pump has tripped.
K03: This relay is active when the seal-failure sensor in the pump has tripped.
K04: This relay is active when the overtemperature sensor in the pump has tripped.
K05: This relay is active when the seal-failure sensor in the pump has tripped.
high for longer than the high-level alarm delay (factory set for 5 seconds).
reactivate in 12 hours if the alarm condition is not corrected.
lag (standby) operation.
Pumps Off level.
level.
delay has elapsed.
Backup float switches
longer than the high-level alarm delay (factory set for 5 seconds).
elapsed.
will reactivate in 12 hours if the alarm condition is not corrected.
relay has tripped.
on the user's screen.
29