Doc No. FM0713 Issue C Page 8
EQUIPMENT
STANDBY
ACTIVE
Functional Door Panel
63mA
200mA
Functional Door Panel + Display
175mA
310mA
Dial Functional Door Panel
175mA
310mA
Digital Door Panel
175mA
310mA
8 Port System Node
30mA
60mA
16 Port System Node
46mA
76mA
8 Port Video System Node
40mA
70mA
16 Port Video System Node
56mA
86mA
8 Port Distribution Node
16mA
46mA
8 Port Video Distribution Node
25mA
55mA
Telephone
0.4mA
0.4mA
Telephone with Privacy ON
10mA
Telephone with Door Open LED ON
3mA
Telephone with Privacy ON and Door Open LED ON
13mA
Video Phone
4mA
120mA
Video Phone with Privacy ON
20mA
Video Phone with Door Open LED ON
13mA
Video Phone with Privacy ON and Door Open LED ON
33mA
Door Lock
See Note 1
PAC Easikey 250 Unboxed Controller
190mA – See Note 2
PAC Reader
90mA – See Note 2
4. SYSTEM NODES
4.05 SMPSU MODULE
The system node includes a 15V/60W switched mode power supply unit which has been factory set to 13.75V
DC to float charge a lead acid standby battery. The SMPSU can provide an output current of 4.3A with solid
state overload protection. The “12V” supply is also protected by a 20mm 4A quick blow fuse located on the
battery protection board.
4.06 BATTERY STANDBY
An optional 12V 7.0Ah rechargeable battery can be connected to maintain operation
in the event of a mains failure. The actual time the system will be supported by the
battery will depend on the total power requirement of the system.
e.g. if the system consumes 2A then a 7.0Ah battery will last approx 3.5 hours (7/2)
A protection circuit will disconnect the battery in the event of prolonged mains failure
to prevent deep discharge and potential damage to the battery. The battery is
protected by a 20mm 4A quick blow fuse located on the battery protection board.
4.07 SYSTEM POWER REQUIREMENTS
To ensure the Entel Ultra System Node PSU has sufficient capacity the total power requirement should be
considered before beginning to install the door entry system. On large multi-entrance systems it is likely
additional power supplies will be required, always ensure the 0V connection is common to all PSU’s and note
their location for future Service.
Note 1:
The lock current will depend on the make and model of the lock release. A fail safe lock release requires power to lock and will
therefore be a constant drain on the system (and battery during a mains fail) whereas a fail secure lock only requires power for a short
period when the door is opened. If the lock is powered from a separate access control system then this can be ignored.
Note 2:
if a PAC Easikey 250 unboxed controller is powered from the Entel Ultra system then this and the PAC reader current must be
considered. On large multi-entrance systems it is recommended that PAC controllers boxed with their own power supply are used.
For example, an estimate of the total current requirement during an active call on an Entel Ultra system with
4 x digital door panels, 1 x 8 port system node, 12 x distribution nodes and 100 telephones would be;
3 x 175mA =
525mA
(3 digital panels in standby) +
310mA
(1 digital panel active) +
30mA
(8 port system node in standby) +
11 x 16mA =
176mA
(11 distribution nodes in standby) +
46mA
(1 distribution node active) +
50 x 3mA =
150mA
(50 telephones with DO LED on) + 50 x 13mA =
650mA
(50 telephones with privacy and DO LED on)
= Total:
1.887A
Note: the above excludes the door locks and PAC system, it also assumes half the telephones are in privacy and
all telephones have the door open LED illuminated. 1.887A is well within the Entel Ultra PSU rating of 4.3A.