Honeywell DCP552 Mark II user manual C95 voltage output control C96 voltage output control

Chapter 7. PARAMETER SETUP

●C93 (time proportional output system)

●C94 (time proportional output system)

0:Goes on again within time proportional cycle

1:Does not go on again within time proportional cycle

•This setting determines whether the output is to go on again after the result of a PID computation has changed in a time proportional cycle (cycle time) and the output has been turned off.

•The difference between the two settings is illustrated below.

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿			￿￿￿￿￿￿￿￿	￿￿￿￿→		￿￿￿￿￿	￿￿￿￿
	￿￿￿￿￿￿				￿￿￿
		→
￿￿￿￿￿￿￿		→	￿￿￿ →		￿￿￿

●C95 (voltage output control)

●C96 (voltage output control)

In a voltage time proportional output driven by SSR, the DCP552 must enter the SSR rated input voltage (optimum striking voltage of arc).

The DCP552 employs a newly developed variable output system that can output optimum striking voltage of arc to accommodate multiple SSR drives. A suitable current value is set on the DCP552 to obtain optimum striking voltage of arc for the internal impedance of the SSR. An equivalent circuit with related equations is shown below.

•Description of symbols

(1) Settings

I0 : set DCP552 output current (range: 2 to 22mA)

V0 : end-to-end load voltage (13.2V)

VSSR' : actual voltage input to SSR

VSSR : rated input voltage range for SSR (VSSR/MIN to VSSR/MAX)

VSSR/MIN : minimum SSR rated input voltage

VSSR/MAX : maximum SSR rated input voltage

Z: internal SSR impedance

VD : internal SSR voltage drop (normally about 1 to 2V)

(2)Equivalent circuit showing connection of one SSR

DCP552	SSR
	Z
I0	VSSR'
(V0 )
	VD

Equations (1) and (2) below must be satisfied.

VSSR/MIN ≤ I0 ⋅ Z + VD ≤V0	Equation	(1)
VSSR' ≤ VSSR/MAX	Equation	(2)
(VSSR' = I0 ⋅ Z + VD)

7-33