Ziton ZP2-AF2-P, Installation Manual

Page: 151 / 176

Chapter 5: Technical specifications
ZP2-A Series Installation Manual 145
Fire and fault outputs [1]
Output voltage range in
standby
−6.1 to −13.7 VDC
Output voltage range in
activation
21 to 28 VDC
Output voltage range in short
circuit
Less than −6.1 VDC
[1] Depending on the current requirements, output cable length restrictions may apply – see
“Calculating the maximum output current as a function of the cable length” below.
[2] Up to a maximum system consumption of Imax b (see “Power supply specifications” on page
141).
24V auxiliary output
Maximum output current [1] 500 mA at 25ºC
385 mA at 40ºC
Configurable options Resettable, not deactivated during reset (default), inactive when
mains off, not deactivated when running on batteries (default)
[1] Up to a maximum system consumption of Imax b (see “Power supply specifications” on page
141).
Calculating the maximum output current as a function of the cable length
The maximum cable length allowed for an output needs to take into consideration
the current required to be supplied by the output.
The following formula can be used to calculate the maximum output current as a
function of the length of the cable:
I
L
= V
C
/ R
C
Where:
• I
L
is the maximum allowable current
• V
C
is the maximum voltage loss in the cable (see note below)
• R
C
is the overall measured resistance of the cable
For example:
I
L
= 5 (V
C
) / 44 (R
C
) = 0.113A (≈ 100 mA)
Note: To guarantee the correct functioning of system devices (requiring a
minimum of 18 V) when the panel is at low voltage warning state (23 V), the
maximum allowable cable loss is 5 V.