Page Number 10 of 28
QLS 311
Subject
to
modifications
2.1B-38008-A01
Form 403074
Installation and Operation Instructions
Pressure relief valve
Fig. 18 - Pressure relief valve (cartridge) in housing
The QLS 311 is protected with a pressure relief valve
(cartridge).
The pressure relief valve limits the pressure build-up in
the QLS 311. It opens at an overpressure of 80 bar (1200
psi).
If the pressure relief valve is actuated, this indicates that
the system is malfunctioning. The lubricant flows back
into the reservoir (not visible).
Upon expiration of the monitoring time of 15 minutes, the
pump switches off. The fault indication
Er
is displayed
on the key pad of the pump. See Display mode under
Control unit.
Pump Display Window
Pump
On
is indicated on the display by an
illuminated
decimal point
(pause time) (fig. 19).
Pump
running
is indicated on the display by a
rotating
light movement of the green display
(operating time)
(Fig. 20).
If the voltage supply is interrupted during the operating
time, the operating time starts from the beginning after
switching on.
Fig. 20 - Green display (operating time)
Fig. 19 - Green decimal point (pause time)
Additional lube cycle (Manual Lube)
- is initiated via the button (Fig. 21). Press the button for 2
seconds.
- can be initiated at any time, provided that the power
supply is on.
Note: If a malfunction is present (flashing display), first
acknowledge this malfunction.
If a fault signal (malfunction) is present, it will be cancel-
led after the system is operating properly.
Monitoring time/malfunction
Fig. 21 - Pushbutton for additional lubrication cycle
Fig. 22 - Display of a fault indication
4208a999
4209a99
4222a99
4210a99
4304a00
If the cycle is not complete within
15 minutes
(monitoring
time) after expiration of the pause time, the pump
immedately switches off.
The fault indication
Er
(error) is displayed as a
flashing light (fig. 22). At the same time, a potential free
contact is available for the external fault indication (opti-
on).
If a
malfunction
is present, the pump
no longer switches
on automatically.