Sonic Alert DCP301 user manual voltage output 1 adjustment Voltage output 2 adjustment

Chapter 7. PARAMETER SETUP

●C 7 8 (voltage output 1 adjustment)

●C 7 q (voltage output 2 adjustment)

When driving an SSR by voltage time-proportional output, the output voltage of the controller must be within the input rated voltage (optimum ignition voltage) of the SSR.

On the DCP301, a newly developed variable output system is utilized that enables output of the optimum ignition voltage even when driving two or more SSRs.

This system sets the optimum current value on the controller so that the optimum ignition voltage with respect to the internal impedance of the SSR side can be obtained.

The following shows equivalent circuits and related formulas.

•Description of Symbols

(1) Details

IO : Setting output current of controller (setting range: 2 to 22mA)

VO: Maximum applied load voltage (approx. 14.7V)

VSSR’ : Actual input voltage to SSR

VSSR: Input rated voltage range of SSR (VSSR/MIN to VSSR/MAX)

VSSR/MIN : Minimum input rated voltage of SSR

VSSR/MAX : Maximum input rated voltage of SSR

Z : Internal impedance of SSR

VD: Internal voltage drop of SSR (normally 1 to 2V)

(2) Equivalent circuit when one SSR is connected

DCP301	SSR
+	+
IO	Z
	VSSR'
(VO)
	VD

––

Formulas (1) and (2) formulas must be satisfied.

(1) formula	VSSR/MIN ≤ IO x Z + VD ≤ VO
(2) formula	VSSR' < VSSR/MAX
	(VSSR' = IO x Z + VD)

7-35