66550070-EN - V6.5 - 15/06/21
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ESVK/KRV782 Series “2 wire Bus” videokit
ESVK/KRV782 Series - Installation handbook
LOCK RELEASE BACK EMF PROTECTION
A varistor must be fitted across the ter-
minals on AC lock release (Fig. 5) and
a diode must be fitted across the ter-
minals on a DC lock release (Fig. 4) to
suppress back EMF voltages. Connect
the components to the lock releases as
shown in figures.
VARISTOR (MOV)
12V AC
LOCK RELEASE
Fig. 3
DIODE 1N4002
12V DC
LOCK RELEASE
Fig. 4
BUZZER BACK EMF
When using intercoms with buzzer call (Art. 924/926, SMART1/2, 3101/2, 3001/2 and 3021/2) add one 0.1uF (100nF) capacitor be-
tween terminals 3 and 6 on the telephone.
BUILT-IN RELAYS – BACK EMF PROTECTION
The Art. 4901 includes selectable back EMF protection on the relays. The jumpers marked MOV (one jumper for each relay) are used
to select the protection type. When using a fail secure lock with connections C & NO the jumper should be in the NO position. When
using a fail open lock with connections C & NC the jumper should be in the NC position and when using the codelock to trigger a gate
controller or another third party controller the jumper should be removed completely (this disables the protection on the relay).
BACK LIGHT ADJUSTMENT JUMPER (JPL)
The jumper JPL (Fig. 2,
D
) is used to
adjust the brightness and determine
the operation of the backlit buttons.
There are four brightness settings for the
backlit buttons and two programming
modes (Mode 1 and 2) for the jumper.
The two modes that can be programmed
change the functionality of the jumper
JPL. The table beside indicates the
programming mode, the position of the
jumper and the operation of the backlit
buttons.
Jumper Position
Back light Operation
M
ode 1
A
(default)
A
B
Back light on low brightness in standby.
Full brightness when any buttons are pressed.
B
A
B
Back light OFF in standby.
Full brightness when any buttons are pressed.
M
ode 2
A or B
A
B
A
B
or
Back light on full brightness all of the time.
JPL removed
in either Mode
A
B
No back light, the back light is completely
disabled.
PROGRAMMING MODE 1 (DEFAULT MODE, JPL = A)
Follow the steps below to set the codelock to Mode 1:
1. Disconnect the power from the Art. 4901 codelock;
2. Short out terminals – and SW2;
3. Press and hold down button 1
and keep it pressed down
while the power is switched back ON;
4. When power is restored to the codelock wait for the module
to emit a single beep and the red status LED (Fig. 1,
B
) to
flash once;
5. Listen for the confirmation tone and wait for the red status
B
) to flash once again;
6. Release button 1
and remove the short between terminals
– and
SW2
;
7. Set the jumper JPL to the desired position.
PROGRAMMING MODE 2
Follow the steps below to set the codelock to Mode 2:
1. Disconnect the power from the Art. 4901 codelock;
2. Short out terminals – and SW2;
3. Press and hold down button 2
and keep it pressed down
while the power is switched back ON;
4. When power is restored to the codelock wait for the module
to emit a double beep and the red status LED (Fig. 1,
B
) to
flash once;
5. Listen for the confirmation tone and wait for the red status
B
) to flash once again;
6. Release button 2
and remove the short between terminals
– and SW2;
7. Set the jumper JPL to the desired position.
BACK LIGHT AND BUTTON OPERATION
If the back light programming mode is set to Mode 1 (with jumper JPL in either the A or B position) when a button is pressed on
the keypad the back light will switch to full brightness for approximately 10 seconds.
After this time the back light will either switch OFF or switch back to low brightness (depending on the jumper position) unless another
button has been pressed within the 10 second period in which case the back light will stay on full brightness for a further 10 seconds.
The exception to this is if the back light programming mode is set to Mode 2, i.e. the back light will be on full brightness all of the
time or if the jumper is removed the back light will be disabled.
Art. 4901
Digital codelock module
Summary of Contents for ESVK
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