User Manual

15263 Ver 2.1 DRAFT E PAC Portico 2200/1200 Series Installation Guide
Page 38 © 2003 Blick USA, Inc.
power supply).
• The type of lock, continuous (fail-safe) or intermittent (fail-secure).
• The length of time the system should operate without mains power.
The following tables will help you estimate the current.
Lock Supply Current
For continuous, or fail-safe locks the continuous lock supply current is the current drawn by the lock. For
fail-secure locks, however, you need to estimate the equivalent continuous current by using the following
equation:
CLC=(Lock Current Rating x LRT) x NOP / 3600
where
CLC = Equivalent Continuous Lock Current
LRT = Lock Release Time (in seconds)
NOP = Number of Operations per hour
The lock current rating should be indicated in the lock specification.
Example
A 500mA lock strike with a 5 second lock release time, operating 50 times an hour would give:
CLC=(500 x 5) x 50 / 3600 = 35 mA
Note
If you have any doubt about the current drawn by a lock, you should measure it at the controller
using a meter.
The maximum current that should be drawn from each lock output is:
8 amp power supply - 2.0A at 12V dc
8 amp power supply - 1.0A at 24V dc
4 amp power supply – 1.0A at 12V dc
4 amp power supply - .5A at 24V dc
In the table below record the type and current consumption of each lock fitted:
Type: Continuous
Channel Continuous/Intermittent Lock Current
1
2
3
4
Total
Table 1 Continuous Lock Supply Current