Middleby Marshall PS200, PS570 Modulated Gas Output System, Variable Pulse Output System

SECTION 3 - SERVICING COMPONENTS

Appendix - Instructions for Service Kit 47321 - Digital Temperature Controller Kit, 2/02

Figure 4a Figure 4b

Analog temperature controller (P/Ns 28071-0012 and 28071-0018) terminals

New temperature controller terminals

Analog temperature controller

(P/N 34983) terminals

New temperature controller terminals

	Not used on
Not used	some gas and	Not used
	electric ovens

Not used

Not used. These terminals provide PID output (gas ovens with modulating valve) or variable

pulse output (electric ovens with variable pulse system). Neither of these systems were available with ovens equipped with these controllers.

Not used. PS200VL ovens have a sepa- rate high limit module and do not include a cooldown feature.

Not used

Not used. PS200VL ovens do not include a modulating gas system.

Terminal for
28071-0012 and	Terminal for	Terminal for	Description
28071-0018	34983	46837
1	TC+	8	+ TC
2	TC-	7	- TC
5	COM	5	Input to Temperature Control Relay
6	NO	4	Output to High Flame Solenoid or Heater Contactors
L2	L2	L2	Neutral
L1	L1	L1	Power
G	G		Ground
13	--	9	Input to Cooldown Relay
14	--	10	Output from Cooldown Relay
15	--	11	Input to High Limit Relay
16	--	12	Output from High Limit Relay
--	--	15	PID or Variable Pulse Output
--	--	16	PID or Variable Pulse Output

Figure 5a

Modulated Gas Output System

			Modulating
4-20mA	Amplifier board		valve
input
			0-24VDC
			output
NOTE: Controller P/N 32571 used Terminals 4 & 5		24VAC
for the 4-20mA input to the amplifier board.
These connections must be moved to Terminals		input

15 & 16 on the new controller as shown.

Page 5 of 10

Figure 5b

Variable Pulse Output System

Relay

20VDC pulsed output

NOTE: Safety switches may be placed between the temperature controller and the relay on some oven models.

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