SCR-100 / ZKG-2000 Heating Power Controller: Wiring, Setup and Fault Finding

The SCR-100, also sold as the ZKG-2000, is a 48 × 48mm panel heating power controller for blow moulding, thermoforming and packaging machines. It is important to be clear about what it is: it is not a PID temperature controller. It sets heating power as a percentage of line voltage and outputs a phase-angle trigger signal; an external M1DK / SSR-DV pulse-triggered SCR module carries the load current. Ordering data is on the SCR-100 / ZKG-2000 product page.

1. Specification

Parameter	Specification
Model	SCR-100 / ZKG-2000
Type	Digital SCR voltage / heating power regulator
Working voltage	AC 220V ±15%, 50/60Hz
Power consumption	Approx. 3VA
Control method	SCR phase-angle trigger with deep voltage negative feedback
Output voltage range	0–220VAC
Display	Digital PV / SV LED display
Wiring terminals	T1 / G / N / L
Panel size	48 × 48mm, cutout 45 × 45mm
Load	Single-phase resistive, via external SCR module

2. Terminal function

Parameter	Specification
L	220VAC live supply to the controller
N	Neutral
G	Phase-angle trigger output to the SCR module G terminal
T1	Trigger return, to the SCR module T1 terminal

The heater current never passes through the controller. Only the four terminals above are wired at the panel; the load cabling runs through the SCR module.

3. Commissioning

• Confirm the SCR module rating is at least twice the steady-state heater current and that it is mounted on a suitable heat sink.
• With the heater isolated, power the controller and check the display responds to the setting buttons.
• Energise the load circuit at a low setting and confirm output voltage rises smoothly as the setting increases — a jump straight to full output indicates a failed module.
• Check module temperature after 30 minutes at working power; a case too hot to touch means the thermal design needs revision.
• Where the process needs closed-loop temperature control rather than fixed power, add a PID temperature controller with a 4–20mA or SCR trigger output instead.

4. Fault finding

Parameter	Specification
Display lit, no heating	Trigger wiring on G / T1 open or reversed; or the SCR module has failed open.
Full power regardless of setting	SCR module failed short. Isolate immediately and replace; check for a thermal cause.
Output unstable	Trigger wiring routed alongside load cables, or a loose neutral connection.
Display flickers or resets	Supply dips at the L / N terminals, often from sharing a circuit with contactor coils.

5. FAQ

Is the SCR-100 a temperature controller?

No. It regulates heating power in open loop. Pair it with a temperature controller if you need to hold a setpoint.

Is SCR-100 the same as ZKG-2000?

Yes, the same product is sold under both names.

Which SCR module should I order with it?

An M1DK / SSR-DV module rated at roughly twice the load current — 25A to 100A options are available.

Can it control a three-phase heater?

No. For three-phase loads use an SCR3L three-phase regulator or the BSTY series.

Technical support: sales@strong-ele.com.