Weidmuller G128 Ultra SlimPak - Manual (Page 3)

Unless otherwise specified, the factory presets the Model G128 as follows:
Input: J Type Range: 0 to 350°C Output: Dual, SPDT
Trip: A: HI, B: LO Failsafe: No Deadband: A, B: 0.25%
The DC power input accepts any DC source between 9 and 30V, typically a 12V or 24Vdc source is used.
For other I/O ranges, refer to Table 1 and reconfigure switches SW1 and SW2 for the desired input type,
range and function.
Do not attempt to change any switch settings with power ap-plied. Severe damage will result!
1. With DC power off, position switch SW1-1, 2, 3 and SW2-1 through 6 for the desired input range (Table 1) .
2. Set positions 4 and 5 of function switch "SW1" to ON for a HI trip setpoint or OFF for a LO trip setpoint
(Figure 4).
3. Set position 6 of function switch "SW1" to ON for non-failsafe operation or OFF for failsafe operation
(e.g. alarm trips upon power failure).
4. Set positions 7 and 8 of function switch "SW1" to upscale or down-scale burn-out.
1. After configuring the DIP switches, connect the input to a calibrated TC source and apply power. Refer to
the terminal wiring diagram.
NOTE: to maximize thermal stability, final calibration should be performed in the operation installation,
allowing approximately 1 to 2 hours for warm up and thermal equilibrium of the system.
2. Setpoint: set deadband at its minimum (20 turns counter clockwise) before adjusting the setpoint. With
the desired trip thermocouple millivolt input applied, adjust setpoint until the relay trips. For HI trip calibration,
start with the setpoint above the desired trip (20 turns clockwise). For LO trip calibration, start below the
desired trip (full counter clockwise).
3. Deadband: Set deadband to its minimum (20 turns counter clockwise). Set the setpoint to desired trip.
Adjust thermocouple millivolt input until relay trips. Readjust deadband to 5% (20 turns clockwise). Set
voltage/current input to desired deadband position. Slowly adjust deadband until relay untrips.
When switching inductive loads, maximum relay life and transient EMI suppression is achieved using
external protection (see Figures 2 and 3). Place all protection devices directly across the load and
minimize all lead lengths. For AC inductive loads, place a properly rated MOV across the load in parallel with
a series RC snubber. Use a 0.01 to 0.1 HF pulse film capacitor (foil polypropylene recommended) of
sufficient voltage, and a 47 M, 1/2W carbon resistor. For DC inductive loads, place a diode across the load
(PRV>DC supply, 1N4006 recommended) with (+) to cathode and (-) to anode (the RC snubber is an
optional enhancement).
Configuration
WARNING:
Calibration
Relay Protection and EMI
Suppression
Figure 4: G128 input range/function selection (SW1) Factory default settings