OEM SHC CONTROLLER – INSTALLATION INSTRUCTIONS
MU1B-0441GE51 R0710B
6
Buffer Battery
A 24 V emergency battery module with internal charge
control can be connected to the controller terminal 3 to
enable safe closing at power failure. 1 Ah is recommended.
The battery module provides power voltage only in the event
of a power supply failure (at terminals G and G0). If the
microprocessor detects that power is being fed in simul-
taneously via terminals G and G0 and from the battery
module, this is recognized as a power supply failure.
INPUTS/OUTPUTS
General Information
The controller is equipped with removable screw-type
terminal blocks which allow the terminal assignment to be
made before plugging them into the unit and to be preserved
after unplugging them from a unit requiring repair or
replacement.
Wiring the Inputs/Outputs
The screw-type terminals support wiring with flexible or
massive cables of 0.35 mm² up to 2.5 mm².
Two wires with a total thickness of 14 AWG can be twisted
together and connected using a wire nut (include a pigtail
with this wire group and attach the pigtail to the individual
terminal block). Deviations from this rule can result in
improper electrical contact. Local wiring codes may take
precedence over this recommendation. Wire to the terminal
blocks as follows:
1.
Strip 5/16 in. (8 mm) insulation from the conductor.
2.
Insert it at the required terminal location, and tighten the
screw to complete the termination. Fix the cable using
cable binders if required.
HARDWARE FEATURES
Stepper Motor Output
The controller is able to drive bipolar stepper motors with
12 V or with 24 V supply voltage. The stepper motor is
connected to terminals 4 to 8 (see terminal assignment) with
shielded motor cable.
Stepper Motor Parameters
Motor voltage
12 V or 24 V, current (chopper)
control
Step frequency
10…62,5 steps/sec
Motor current
80…800 mA
Holding current
0…100% of the motor current, in
approx. 10% steps
Max. no. of steps
1…10,000 steps
No. of opening steps
1…1,000 steps
Besides the Honeywell electronic expansion valve type EEV
(models EV2, EV3, EV4), the controller provides presettings
for the stepper motor valves listed in Table 3 with the cor-
responding parameters. These valves can be configured by
just choosing the valve type. Other valves which fit to the
above listed ranges of stepper motor parameters can be
configured manually.
Table 3. Supported valves (presettings)
model
min. step
max. step
step close
steps / sec
peak [mA]
hold [mA]
duty [%]
Carel E2V, E3V, E4V
50
480
520
50
450
100
30
RS485
The controller provides an isolated RS485 communication
interface which is connected to terminals 9 to 11 (see Table
1).
The max. permissible number of devices simultaneously
connected to RS485 output is 32. The RS485 cable is of
impedance 120 Ohm with maximum length of 1000 m.
Connection via STP (Shielded twist pair) is recommended.
Terminal resistors 120 Ohm for terminal devices are
recommended for length > 40 m. The communication
frequency (baudrate) can be one of the following: 2400,
4800, 9600, 19200, 28800, 38400, 57600, or 115200.
