H1000 Elevator Control
Page 14 of 20
Installation Guide
October 2015 • Rev. 1.7
Connection to the Elevator Controls
ISOLATING RELAYS
For safety and system serviceability the access control system should be isolated from the
power connections of the elevator buttons. An Elevator Interface Relay Box must be used
for this purpose, to prevent high voltage and high voltage spikes from interfering with the
access control system. This Elevator Relay Interface Box must be supplied by the elevator
company to avoid potential liability issues. The Elevator Interface Relay Box must provide
isolating relays which physically isolate the voltage present on the elevator buttons from the
H1000 outputs.
It is important to understand that the H1000 panel’s output relays (“Form C”) will be
controlling the coils of the relays in the interface box and that a single shielded single pair
must be used for each relay connection. Multi-pair cable must not be used as inductive
voltage spikes will be passed onto the adjacent wires. These voltage spikes can cause the
access control panel to be intermittent. To eliminate relay coil voltage spikes it is important
to place a power diode (1N4007) right at the coil connection.
SAFETY
If the elevator relay interface box contains 110/220 VAC, it should be labeled outside with
“DANGER High Voltage Contained Inside”. This is important for the safety of personnel
doing maintenance.
FIRE ALARM
In the event that a building fire alarm occurs it is imperative that all floor selector buttons
in the cab are operational. When a fire alarm occurs, the fire alarm panel
typically operates
a dry relay contact. In normal operation (No Fire Alarm) this “Form C” relay contact is
“Closed”. In the event of a fire alarm this “Form C” relay contact goes “Open”. This relay
is used to automatically bypass the access control system in the event of a fire alarm so that
all floor selection buttons are operational.
SERVICE OVERRIDE SWITCH
It is advisable to have an Elevator Access Controller Bypass Switch present. This allows the
elevator company an easy means to work on the elevator without requiring the presence of
the company in charge of maintaining the access control equipment. Similarly, if there is a
failure with the elevator access control system, the bypass switch will allow elevator
operation until the access control system is repaired.
