Helios EVS Series, Installation And Operating Instructions Manual

28

Smoke exhaust fan control system – 

EVS

Installation and Operating Instructions

5 .4  Error description Fault signals

Fault signals are delivered via the display on the front operating and display pad, on fireman‘s switches and pushbutton 
alarms. There is also an option to forward the fault signal using the non-isolated contact in the EVS.

Possible causes for fault signals:

• 

No mains power supply or main switch deactivated

• 

Control fuse dropped, the low voltage power supply is defective

• 

Motor monitoring device has triggered

• 

Fault in detector circuits

• 

Repair switch or system fault has triggered

The smoke exhaust fan is deactivated in ventilation mode. The smoke exhaust fan is not deactivated in smoke ventilation 
mode. The signal must be unlocked on the motor protection device and the control unit after fault rectification.
Fault signals regarding the mechanical smoke extraction system must be indicated or forwarded in the building, so that they 
are immediately recognised by users or the operator.
The cause of the fault signal must be immediately rectified in order to restore system functionality.

Fault

Cause

Solution

Visual fault indication and poten-
tial-free fault message (Passage 
terminal 53/54)
Determine cause of fault via visual 
diagnosis on circuit board (LED flashes 

yellow)

FWS/BMA/DKM/RMR
•  Short circuit or wire breakage in 

detector circuit for FWS, BMA, 
DKM, RMR (indicated as according 
to diagnosis LED)

•  No terminating resistor on last 

detector in circuit

Check corresponding detector 
circuit(s) and rectify the fault. Yellow 
diagnosis LED goes out

TK/KL
Motor protection has triggered or wire 

breakage. Diagnosis LED TK/KL lights 
yellow

Check motor/motor protection (if 
necessary, unlock)/check cable. Then 

acknowledge using button TK/KL 

Reset. Yellow diagnosis LED goes out 
(if no motor protection connected, 

unlock jumper

RepSW/Fuse

•  Control fuse F1/F2 dropped

•  Repair switch has been switched 

or wire breakage between terminal 

29/30

•  Replace triggered control fuse. 

Yellow diagnosis LED goes out

•  Check repair switch or cable. If no 

repair switch connected, insert jum-

per. Yellow diagnosis LED goes out.

Alarm/SysOFF

•  Control system locked via input 

terminal 31/32

•  Control system deactivated via FWS 

(LED FWS flashes simultaneously)

Check lock input (terminal 31/32) for 
correct wiring. There must no inserted 

jumper. Yellow diagnosis LED goes out

System switches to smoke extraction 
although it has not been activated

No supply voltage

If necessary, connect power supply

Main switch deactivated

If necessary, activate main switch

Smoke detector detects smoke

Rectify cause and unlock control sys-

tem by deactivating the main switch 
for at least 3 s.

No terminating resistor or wire breaka-
ge for detector circuit BMA. Diagnosis 
LED lights red

Check detector circuit if BMA not 
connected. Insert resistor at terminal 

8/9

No low voltage 24 V DC at terminal 

17/18

Control fuse F2 defective

Renew control fuse F2 and measure 

low voltage between terminal 17/18 
--> 24 V

Measured motor current is not consis-

tent with motor type plate

Mechanical motor defect

Check ventilation unit for mechanical 

inhibition

Incorrect motor rotation direction. 

Considerably higher current consump-
tion

Adjust motor rotation direction

Calculation error for star/delta

Setting current to I nom x 0.58

Potential-free fault message (Passage 

terminal 53/54), but no visual fault 
indication on front module

Front module connected incorrectly

Insert flat cable plug 

Main switch deactivated

If necessary, activate main switch

No supply voltage

If necessary, connect power supply

Potential-free smoke extraction alarm. 
(Passage terminal 50/51) although no 
smoke extraction

Main switch deactivated

If necessary, activate main switch

No supply voltage

If necessary, connect power supply

    EN