Ziton ZP752-2 | Addressable Line Sounder Driver | 2 Monitored Circuits, Surface Mount

FAQs

Can the two output circuits be controlled independently?

No, both Output 1 and Output 2 on the ZP752-2 share the same addressable loop address and therefore switch on and off simultaneously. The two circuits are linked and cannot be activated independently. If independent control of two separate sounder circuits is required, two separate ZP752-2 modules with different addresses would need to be installed. However, having both circuits operate together from a single address is typically the desired configuration for providing synchronized alarm signaling across multiple zones or floors of a building from one trigger source.

How many ZP752-2 modules can be installed on one loop?

Up to 127 ZP752-2 modules can be connected to a single ZP addressable loop, as the Ziton protocol supports a maximum of 127 addresses per loop. However, for systems that must comply with BS5839-1 requirements where sounder response to manual call point operation must occur within 3 seconds, only the first 16 ZP752-2 modules assigned to addresses 1-16 on the loop can guarantee this response time. The faster response for lower addresses is due to the sequential polling nature of addressable systems – devices with lower addresses are polled earlier in each 2-second cycle.

What power supply options are available for the ZP752-2?

The ZP752-2 offers dual power supply options for its conventional output circuits. Power can be supplied from an external EN54-4 compliant power supply rated at 22-30VDC, which is the recommended option for reliability and system integrity. Alternatively, power can be drawn directly from the fire alarm panel’s 24VDC auxiliary supply via separate wiring. The module itself draws 400µA standby and 600µA when activated from the addressable loop for monitoring and control, while the external supply or panel auxiliary output provides the higher current (up to 1A per circuit) needed to drive the connected sounders and visual indicators.

What types of devices can be connected to the output circuits?

The ZP752-2 is designed to operate polarized sounders and visual indicators, where the device polarity must be observed during installation. The terminal markings (plus/minus) indicate signal polarity when the circuit is active – notably, the polarity reverses when the circuit is inactive, which is how the module monitors for faults. If non-polarized devices need to be used, a 1N4002 or 1N4007 diode must be inserted in the positive leg of each device with the stripe on the diode facing toward the device. Each circuit can deliver up to 1A at 24VDC, sufficient for multiple sounders or combined sounder/beacon units.

How does fault monitoring work on the ZP752-2?

The ZP752-2 provides comprehensive fault monitoring for both the power supply and connected output circuits. Each output circuit requires a 2.2kΩ end-of-line resistor which enables the module to detect both open circuit faults (wiring break or device disconnection) and short circuit faults (wiring shorted together). The module also monitors the external power supply or panel auxiliary supply, reporting any mains failure, battery issues, or loss of the 24VDC output to the control panel. Additionally, each circuit is protected by a monitored 1A fuse – if a fuse blows, this fault is also detected and reported. All faults are indicated by the amber LED on the front plate and reported to the control panel with the module’s address.

What does the LED indicator show?

The ZP752-2 features a tri-colour LED status indicator on the front plate that provides clear visual feedback of the module’s operational status. When the LED is off, the module is in normal standby condition with no alarm and no faults. The red LED illuminates when the module is activated and both sounder circuits are energized, confirming alarm operation. The amber LED illuminates when a fault condition is detected, which could include open or short circuit faults on either output circuit, power supply failure, fuse blown, or other monitored fault conditions. This local indication supplements the detailed fault reporting sent to the main control panel.

How is the address set on the ZP752-2?

The ZP752-2 uses a seven-segment DIP switch (SW1) for address configuration using binary coding. Each switch segment has a decimal value: switch 1 = 1, switch 2 = 2, switch 3 = 4, switch 4 = 8, switch 5 = 16, switch 6 = 32, and switch 7 = 64. The device address is calculated by adding the values of all switches set to ON. For example, to set address 007, switches 1, 2, and 3 should be ON (1 + 2 + 4 = 7) with all other switches OFF. Any address from 001 to 127 can be configured, but each address must be unique on the loop. For fastest response to manual call points, use addresses 1-16.

What is the purpose of the power supply supervision relay input?

The ZP752-2 includes an optional input for connecting a supervision relay from the external power supply. Many EN54-4 compliant power supplies include a relay output that monitors the status of the power supply – typically the relay is closed (short-circuit) when the power supply is operating correctly. If your external power supply has this feature, connect the supervision relay contacts to the designated input terminals on the ZP752-2. This enables the module to actively monitor power supply health and report any issues to the control panel. If your power supply does not have a supervision relay, this input should be short-circuited (jumpered) to avoid generating a false fault indication at the module.