February, 2019
eMAX-LP4502-Man
Page 11 of 20
9. Relay Circuit Wiring:
The eMAX-LP4502 includes four (4) relays with Form-C contacts (dry) that provide for controlling
door lock mechanisms or alarm signaling. Each relay has a Common pole (C), a Normally Open pole
(NO) and a Normally Closed pole (NC), and is rated at
5A @ 30Vdc resistive on the Normally-Open
(N/O) contacts, and 3A @ 30Vdc resistive on the Normally-Closed (N/C) contacts.
When controlling
the delivery of power to the door strike, the Normally Open and Common poles are typically used.
When momentarily removing power to unlock the door, as with a mag lock, the Normally Closed and
Common poles are typically used. Check with local building codes for proper egress door installation.
Door lock mechanisms can generate feedback to the relay circuit that can cause damage and
premature failure of the relay plus affect the operation of the eMAX-LP4502. For this reason, it is
recommended that a diode be used to protect the relay. Wire should be of sufficient gauge to avoid
voltage loss.
DIODE SELECTION:
DIODE Current Rating > 1 X STRIKE CURRENT
DIODE Break Down Voltage: 4X STRIKE VOLTAGE
FOR 12VDC or 24VDC STRIKE, DIODE 1N4002
(100V /1A) TYPICAL
10. Memory Backup Battery:
The static RAM and the real time clock are backed up by a lithium battery when input power is
removed. This battery should be replaced annually. If data in the static RAM is determined to be
corrupt after power up, all data, including flash memory, is considered invalid and is erased. All
configuration data must be re-downloaded. Remove the insulator from the battery holder after
installation. Battery type: BR2330 or CR2330.
11. IT Security
When installing the eMAX-LP4502, it is important to ensure that it is done in a secure manner.
Upon installation, the user accounts to the web configuration page should be created with secure
passwords, and that all DIP switches are in the off position for the normal operating mode. The
eMAX-LP4502 is shipped from the factory with a default login account, which is enabled when DIP
Switch 1 is moved from OFF to ON. The default login user name and password will be available for
five minutes once enabled. Therefore, it is important that at least one user account is defined, and
the DIP switches are set to OFF before the eMAX-LP4502 is commissioned. It is also highly
recommended not to configure the eMAX-LP4502 with an IP address that is accessible from the
public Internet.
To further enhance network security, options are available to disable SNMP, Zeroconf discovery, as
well as the web configuration module itself. Additionally, data encryption can also be enabled over
the host communication port.