Installation Guide
Stepper Output Module Type AK-XM 208C
Info for Centralized (Rack) Control
The AK-XM 208C module opens and closes stepper valves opposite to how the AK-XM 208B operates. For centralized (rack) control, ensure the AK-XM 208C has a dedicated line-up, consisting only of the Communication module and the AK-XM 208C. No other modules should be added to the AK-XM 208C.
A visual representation of the AK-XM 208C module shows its compact design. Dimensions provided are 140 mm in height, approximately 8 mm (5/16 inch) in width, 144 mm (5 11/16 inches) in depth, and 76 mm (3 inches) in height.
Environmental and Electrical Specifications
Operating ambient temperature range: -20 °C to 55 °C (-4 °F to 131 °F). Operating humidity: 0-95% RH, non-condensing. Ingress Protection rating: IP10 / VBG4. Controller supply: 5 VA. Valve supply: 7.8 VA plus valve consumption. Construction class: Class II.
The product is CE marked and cULus Listed (UL File: E357029), compliant with Class 2 or LPS in accordance with NEC. For supply connections, use 16 AWG or larger wires rated for at least 90 °C (194 °F). Only copper conductors are permitted.
Module Configuration: 4 x Stepper Valve Output, 8 x Analog Inputs (AI)
The module features 4 stepper valve outputs. The terminals labeled '+' and '-' for these outputs must not be earthed.
The module includes 8 analog inputs (AI), capable of handling a maximum of 10 V.
Separate Power Supply Requirements
A separate power supply is required for the AK-XM 208C, rated at 24 VAC/AC with a tolerance of +/- 20%. The total VA consumption depends on the number and type of valves connected. For example, with 4 valves, the consumption could be approximately 7.8 VA + (4 x 1.3 VA) = 13 VA, or 7.8 VA + (4 x 5.1 VA) = 28.2 VA. Compatible power supply units include AK-PS 075 and AK-PS 150.
Output Specifications
The output operates on 24 V d.c. with a step rate of 20-500 steps/s. The maximum RMS current per valve is 325 mA, and the total output power (Pout) is a maximum of 21 VA. It is crucial that the connection to the valve is not broken using a relay.
Valve Data
| Valve type | Power (P) |
|---|---|
| ETS 12.5 - ETS 400 | 1.3 VA |
| KVS 15 - KVS 42 | 1.3 VA |
| CCMT 2 - CCMT 8 | 1.3 VA |
| CCM 10 - CCM 40 | 1.3 VA |
| CTR 20 | 1.3 VA |
| CCMT 16 - CCMT 42 | 5.1 VA |
Wiring and Terminal Details
The module features a terminal block with terminals numbered 1 through 40. Terminal 17 is for 12 V, Terminal 18 is for 5 V, and Terminals 19, 20 are for a connection labeled 'b'. The screen on pressure transmitter cables must only be connected at the end of the module.
Indicator lights provide status information: ? Green = valve opens, ? Green = valve closes, ? Red flash = valve error / connection error.
Terminals are grouped for specific functions: 25-28 for Step 1, 29-32 for Step 2, 33-36 for Step 3, and 37-40 for Step 4.
A table maps Step/Terminal numbers to specific terminal ranges and valve types: Step 1 (Terminals 25-28) for ETS, CCM/CCMT. Step 2 (Terminals 29-32) for ETS, CCM/CCMT. Step 3 (Terminals 33-36) for ETS, CCM/CCMT. Step 4 (Terminals 37-40) for ETS, CCM/CCMT. CTR valves use White wires. KVS 15 and KVS 42-54 valves use Black, Red, and Green wires respectively for their connections.
Input Signal Mapping:
- Sensor (S) Input: Supports Pt 1000 ohm/0°C. Connections include SIG, GND, S1, S2, Saux1, Saux2, SSA, SdA.
- Pressure (P) Input: Compatible with AKS 32R, AKS 2050, MBS 8250, and AKS 32 sensors. Connections include SIG, GND, 5V, P0A, P0B, PcA, PcB, Paux. Pressure ranges are specified as -1 - xx bar and -1 - zz bar.
- Voltage (U) Input: Accepts 0-5 V or 0-10 V signals, connected via SIG and GND.
- On/Off Input: Configurable for External Main switch, Day/Night, or Door status. Connected via SIG and GND. Active states are 'Closed' or 'Open'.
The module has 12 points for connections: Points 1-8 (Terminals 1-2 to 15-16) are Analog Inputs (AI 1 to AI 8). Points 9-12 (Terminals 25-28 to 37-40) are Stepper Valve Outputs (Step 1 to Step 4).
A diagram illustrates the connection of a 24V power supply to the module. It also shows the stepper valve output terminals '+' and '-' which must not be earthed, and an analog input (AI) with a maximum of 10V. A separate power supply diagram shows 24 VAC/AC +/- 20% input. The output section shows a 24 V d.c. connection with specifications for step rate, current, and power, emphasizing that valve connections should not be broken by a relay. Terminal labels A through H are shown for valve connections.
A diagram shows the terminal block layout from 1 to 40, with specific terminals designated for +12V, +5V, and other functions. It details the grouping of terminals for stepper valve outputs (e.g., 25-28 for Step 1) and analog inputs (e.g., 1-2 for AI 1). The diagram also includes a legend for valve open/close indicators and error indicators.
Disposal Information
This product contains electrical components and must not be disposed of with domestic waste. Equipment must be collected separately as Electrical and Electronic waste, according to local and currently valid legislation. ♻️
